Koji & Grown Enzymes Research Directory
This wing exists because the enzyme question has three answers, not two. Internal enzymes covers what a malt develops in germination; external enzymes covers what is dosed in from an industrial producer. Neither describes what happens when Aspergillus oryzae is grown on cooked grain and secretes amylases and proteases directly onto it.
That distinction is structural rather than academic. Koji is not a malt — nothing germinates — and it is not an addition, because the enzymes are never isolated, shipped, or dosed. It is a third way of getting conversion power into a mash, with its own science, its own industry, and its own centuries of practice on rice, the gluten-free grain this directory already maps.
The honest shape of this subject: enormous depth in Japanese brewing science, essentially no published work applying it to gluten-free beer. Koji on sorghum, millet or teff is a live idea in craft brewing rather than a documented field, and this page maps the gap as much as the knowledge.
How to read it: the same categories as the sorghum directory, with the same rules. Entries are brief, factual, dated, and linked to primary sources. Descriptions are not endorsements.
Coverage here is necessarily international — the science and the practice are Japanese in origin, and the US layer is craft-scale experimentation.
Directory established 2026-08-25 · first verification pass 2026-08-26.
Key topics — find entries by subject, across every category
How to read it: each topic lists the entries that touch it, so a reader hunting one subject can jump straight to the right sections.
The gluten-free case — whether a mould can do what malt does on a grain that has no diastatic power to speak of: the two sorghum studies and the 2023 adjunct work (Literature), the Monterrey group behind them (Institutions, Contributors), and the Montana State malt trials (Projects).
The organism & the safety line — why A. oryzae and not its toxigenic relative: the GRAS notice and the aflatoxin comparison (Literature), the two USDA-ARS laboratories that study A. flavus (Institutions), and the sorghum mycotoxin baseline this page has to clear (Literature).
Where conversion power comes from — sourcing the agent rather than buying it: the NRRL culture collection and its federal funder (Institutions, Funders), the century-old tane-koji houses and the US spore suppliers (Suppliers & Industry).
The commercial proof, and its limit — an industry already doing this on a gluten-free grain: the US sake breweries and their trade body (Suppliers & Industry, Organizations), against the fact that nobody has carried it to sorghum (How the field connects, Research gaps).
1. Institutions — the research institutes and universities behind koji science
— Federal laboratories —
USDA-ARS National Center for Agricultural Utilization Research (NCAUR) — Peoria, Illinois. Home of the ARS Culture Collection (NRRL), the largest publicly available microbial collection in the world at roughly 93,000 strains of bacteria and fungi, including the Charles Thom Aspergillus and Penicillium holdings. It distributes cultures to scientists in more than forty countries. For a US brewer, this is the federal answer to "where would the strain come from." NRRL collection · catalog · Verified 2026-08-26
USDA-ARS Southern Regional Research Center — New Orleans, Louisiana. Food and Feed Safety Research, running long-standing work on aflatoxin control and the A. flavus–corn interaction. The federal laboratory that studies the toxigenic relative of the koji mould, on a grain this directory already covers. Research project · Verified 2026-08-26
— US universities and institutes —
Montana State University — Barley Breeding Program & Malt Quality Lab — Bozeman, Montana. Running koji malt research with two organisms, A. oryzae and A. luchuensis, testing steep times and fermentation schedules against the program's own Buzz barley. The lab also provides third-party malt analysis to craft maltsters, which is how the work reaches industry. Koji at MSU · Verified 2026-08-26
Broad Institute — Cambridge, Massachusetts. Runs the Aspergillus Genome Projects under its Fungal Genome Initiative, the comparative backdrop against which A. oryzae's expansion over its relatives is read. Aspergillus genome projects · Verified 2026-08-26
J. Craig Venter Institute (JCVI) — United States. Carries the A. oryzae genome work in its publication record, one of the international partners on a consortium that was principally Japanese. JCVI record · Verified 2026-08-26
Rutgers University — New Jersey. Carries the A. oryzae genome work in its institutional record as a consortium partner. Publication record · Verified 2026-08-26
Oregon State University — Fermentation Science — Corvallis, Oregon. Its fermentation science programme teaches sake among the fermented products it covers, putting grown-enzyme conversion inside a US university curriculum rather than only in industry. Programme · Verified 2026-08-26
NC BioNetwork — North Carolina Community College System. Runs a sake brewing course covering koji culturing, rice steaming, fermentation and kasu filtration. Workforce training rather than research, and notable for that: the US teaches this as a trade skill, not a science. Course · Verified 2026-08-26
— International anchors —
Tecnológico de Monterrey — Centro de Biotecnología FEMSA (CB-FEMSA) — Monterrey, Mexico. The only institution we have found publishing repeatedly on koji applied to sorghum for brewing: both the 2017 wort-yield study and the 2020 gluten-free lager study came out of this group. The 2020 study · Verified 2026-08-26
National Research Institute of Brewing (NRIB) — Higashihiroshima, Japan. Founded 1904 under the Ministry of Finance as a national research body for alcoholic beverages; relocated from Tokyo in 1995. Over a century of continuous work on A. oryzae, sake yeast and brewing technology makes it the field's deepest institutional archive. NRIB history · Verified 2026-08-26
National Institute of Advanced Industrial Science and Technology (AIST) — Japan. Institutional base of the A. oryzae genome effort published in Nature in 2005 — the work that put koji mould on modern genomic footing. Genome paper · Verified 2026-08-26
Tohoku University — Sendai, Japan. Professor Emeritus Eiji Ichishima proposed from here in 2004 that koji mould be designated Japan's national fungus, a proposal the Brewing Society of Japan adopted in 2006. Koji as national fungus · Verified 2026-08-26
Noda Institute for Scientific Research — Japan. A standing private funder of koji-mould science, appearing in the acknowledgements of current A. oryzae cell-biology work alongside the national agencies. Funded study · Verified 2026-08-26
University of Copenhagen — Department of Food Science — Denmark. Publishing current work on solid-state koji fermentation of cereal and oilseed side streams, treating moisture as a dynamic variable rather than a fixed starting condition. 2026 study · Verified 2026-08-26
Nordic Food Lab — Copenhagen. Published koji history and process work aimed at cooks and fermenters, and among the earliest Western institutional efforts to document the technique outside Japan. Koji history and process · Verified 2026-08-26
University of Pretoria — South Africa. The institutional home of the sorghum mould-control literature that this page's safety argument runs through. Its presence here is as the counterweight to koji rather than its source. Lefyedi & Taylor 2007 · Verified 2026-08-26
Koji's academic base is concentrated in Japan and much of its literature is Japanese-language, which limits what an English pass reaches. In the United States the expertise sits in breweries rather than universities.
2. Contributors — the researchers and brewers behind the work
— US researchers and practitioners —
Aline Duarte Correia de Brito — PhD candidate, Montana State University. Ran the only US academic koji-malt programme we have found, testing A. oryzae and A. luchuensis against MSU's Buzz barley across three steep times and three fermentation lengths — and published it in the Journal of the American Society of Brewing Chemists in 2025. US koji research exists; it is one person's project, and it is now in the literature. Koji at MSU · the paper · Verified 2026-08-26
Byron Stithem — Proper Sake Co., Nashville. Grows koji in-house from spore stock sourced in Japan and maintained across multiple incubators, and supplies it onward to restaurants. One of the few people in the US running grown-enzyme conversion commercially and propagating the organism themselves. Profile · Verified 2026-08-26
Weston Konishi — President, Sake Brewers Association of North America. Leads the trade body for the only North American industry built on grown-enzyme conversion of a gluten-free grain. SBANA · Verified 2026-08-26
Jokichi Takamine — the chemist who isolated the A. oryzae enzyme complex and, in 1895, contracted Parke, Davis & Co. of Detroit to manufacture Taka-Diastase at scale. The first commercially produced enzyme in North America came from koji mould, and it came from him. Koji on the global market · Verified 2026-08-26
Blake Richardson — president and owner, moto-i, Minneapolis. Opened the first sake brewpub in the United States in 2008 — the earliest US operation converting a gluten-free grain with grown enzymes on premises. Interview · Verified 2026-08-26
Justin Potts — co-lead of the Advanced Sake Brewing Certification Course, a bilingual sake professional running the bridge between American brewers and Japanese technical experts. ASBCC · Verified 2026-08-26
Shima Enomoto — co-lead of the Advanced Sake Brewing Certification Course; the other half of the bilingual pairing through which koji-making instruction reaches North American brewers. ASBCC · Verified 2026-08-26
— The koji-on-sorghum group (Mexico) —
Sergio O. Serna-Saldívar — Tecnológico de Monterrey, Research Director at CB-FEMSA. Co-author on both the 2017 and 2020 sorghum-koji studies; a cereal scientist whose wider work runs through gluten-free grain processing generally. Faculty page · Verified 2026-08-26
Esther Heredia-Olea — Tecnológico de Monterrey. Lead author of the 2017 study establishing that malting sorghum with A. oryzae raises gluten-free wort yield and extract. JASBC 2017 · Verified 2026-08-26
E. Cortés-Ceballos — Tecnológico de Monterrey. Co-author on the 2017 wort-yield study. JASBC 2017 · Verified 2026-08-26
— International anchors —
Masayuki Machida — AIST, Japan. Lead author of the 2005 Nature genome paper that established A. oryzae carries 12,074 genes across a 37-megabase genome, expanded 7–9 Mb over its relatives A. nidulans and A. fumigatus. Nature 2005 · Verified 2026-08-26
K. Asai — co-author, A. oryzae genome consortium. Nature 2005 · Verified 2026-08-26
M. Sano — co-author, A. oryzae genome consortium. Nature 2005 · Verified 2026-08-26
Eiji Ichishima — Professor Emeritus, Tohoku University. Proposed in 2004 that koji mould be recognised as Japan's national fungus; the Brewing Society of Japan adopted the designation kokkin in 2006. The proposal · Verified 2026-08-26
Sylvester Holt — University of Copenhagen, Department of Food Science. Co-author of 2026 work on solid-state A. oryzae fermentation of cereal and oilseed side streams — koji applied to processing residues rather than to whole grain. The study · Verified 2026-08-26
John R.N. Taylor — University of Pretoria. Sorghum brewing science's most-cited author appears here on the suppression side of the mould question rather than the cultivation side, as co-author of the standing work on controlling moulds during sorghum malting. He also appears on the sorghum page; the recurrence is the point. Lefyedi & Taylor 2007 · Verified 2026-08-26
M.L. Lefyedi — University of Pretoria. First author on the 2007 study controlling coliforms and moulds in sorghum malting with competing cultures. J. Inst. Brewing 2007 · Verified 2026-08-26
3. Projects & Grants — funded work in flight right now
What qualifies: funding a gluten-free brewer, maltster or researcher could actually pursue for koji work, plus the research lines currently producing output. Described, never endorsed — and we make no claim that any of these has funded koji work before.
— US funding a koji project could be taken to —
USDA NIFA — Agriculture and Food Research Initiative (AFRI). The nation's largest competitive agricultural grants programme, roughly $140 million for FY2026 across six priority areas, two of which — Plant Products, and Food Safety, Nutrition and Health — plainly reach a koji conversion project on a gluten-free grain. AFRI · deadlines · Verified 2026-08-26
USDA NIFA — SBIR/STTR. The small-business route, roughly $19.5 million for Phase II in FY25 with about 45% of Phase II applications funded within each topic area. The realistic path for a maltster or brewery rather than a university. SBIR/STTR · Verified 2026-08-26
Brewers Association — Craft Beer Research and Service Grants. Funds brewing-science research directly, without routing through a crop programme. The only US grant on this page whose subject is beer rather than agriculture. The programme · Verified 2026-08-26
ASBC Foundation — project funding. Grants toward scientific work advancing brewing science, including new methods, plus support for MS and PhD students who are ASBC members. The society already publishes the koji-malt literature; this is its funding arm. ASBC · Verified 2026-08-26
SARE — Sustainable Agriculture Research and Education. NIFA-funded, four regional programmes, more than $389 million awarded since 1988. Its Producer Grants let a farmer or maltster test an idea on-farm — including a value-added product — which is the lowest-barrier route to a first koji trial on a gluten-free grain. SARE grants · producer grants · Verified 2026-08-26
Pennsylvania Malt and Brewed Beverage Industry Promotion Program. State money whose scope is brewing itself. It appears on the internal and external enzyme pages as the one US public funder aimed at this industry; a koji trial in Pennsylvania is inside its remit. Program page · Verified 2026-08-26
United Sorghum Checkoff — research RFP (paused for 2026). The producer board for the grain with the strongest koji evidence normally runs an annual pre-proposal call across crop improvement and high-value markets. It is not seeking pre-proposals in 2026 while it evaluates past funded work, with future rounds to be announced — worth tracking rather than approaching now. Research page · Verified 2026-08-26
— Research lines currently producing output —
Koji malt trials at Montana State (2022– ). Aline Duarte Correia de Brito tested koji strains against Buzz barley using defined parameters — 6, 7 and 8-hour steeps, then 40, 44 or 48-hour fermentations in a commercial proofer held near 86–90°F on day one and 93–97°F on day two — and published the result in JASBC in 2025. Published in enough procedural detail to be repeated on a different grain. Koji at MSU · the paper · Verified 2026-08-26
Koji on cereal and oilseed side streams (Copenhagen, 2026). Active work treating moisture as a dynamic process variable rather than a fixed starting condition, on processing residues rather than whole grain. The current frontier of substrate range, and a plausible collaboration target. The study · Verified 2026-08-26
— Japanese programmes, kept for the sake angle —
JSPS KAKENHI 18K05545 — invasive growth of A. oryzae in rice koji. How far the mould penetrates the grain and how nuclear number rises as it does. Mycelial penetration correlates directly with how much starch gets digested, so this is the mechanism behind koji yield. The study · Verified 2026-08-26
NEDO JPNP20011 — hyphal dispersion mutant for stirred fermentation. Engineering A. oryzae to disperse rather than mat, so it can be grown in stirred tanks. The bridge between solid-state koji and industrial submerged production — the question of whether this scales beyond a tray. The work · Verified 2026-08-26
4. Funders & Programs — who pays for it (described, never endorsed)
What qualifies: a funder whose money traceably appears in work documented here, or a standing program whose scope covers this subject. Described, never endorsed.
— US federal —
USDA-ARS. The federal in-house funder standing behind the NRRL Culture Collection at Peoria — roughly 93,000 microbial strains maintained and distributed as public infrastructure, and the route by which a US researcher or brewer would obtain a characterised A. oryzae strain without importing one. It also funds the aflatoxin work at New Orleans on the organism's toxigenic relative. NRRL collection · Verified 2026-08-26
Advanced Sake Brewing Certification Course (ASBCC) — run by SBANA with Gakkogura and the Sakeology Center at Niigata University; 2026 is its fourth cohort. A two-week immersive programme for working brewers whose curriculum explicitly covers tane-koji, koji-making, raw material processing and fermentation-mash preparation. It is the only structured route we have found by which a North American brewer can be formally trained in grown-enzyme conversion. ASBCC · Verified 2026-08-26
Sake School of America — US sake education delivering WSET- and SSI-certified courses with hands-on components. Training infrastructure rather than research money, which on this page is the pattern. School · Verified 2026-08-26
NC BioNetwork sake brewing course — publicly funded workforce training in a US community college system, teaching koji culturing as a production skill. Course · Verified 2026-08-26
Montana Wheat and Barley Committee — Montana Department of Agriculture. Published the Montana State koji research under a "Your Checkoff Dollars at Work" banner, which associates producer checkoff money with the only US academic koji programme we have found. The article does not state outright that the committee funded this specific project, and we do not claim it did — but it is the closest thing to US producer money touching koji that this search located. The article · Verified 2026-08-26
— US funders whose scope already reaches this subject —
A cross-analysis against the rest of this directory produces a sharper finding than "no American money exists." It does exist, in quantity, and it is pointed at the grain rather than the method. Every funder below already appears elsewhere in this directory funding rice or sorghum research. None of them, so far as we can find, has funded a koji award.
USDA NIFA. The federal competitive agricultural research agency funding rice and sorghum work across this directory. We searched NIFA, NSF and the SBIR/STTR programmes for koji or* A. oryzae *awards aimed at brewing and found none — the agency that funds both relevant grains does not fund the conversion method. NIFA · Verified 2026-08-26
USA Rice Federation. The national rice industry organization, combining state checkoff funds, industry dues and federal money for research and promotion of US-grown rice. American sake breweries are a domestic rice market converting that grain with grown enzymes; we found no sake or koji research line in its programmes. USA Rice · Verified 2026-08-26
Arkansas Rice Research and Promotion Board. The largest US rice-producing state's checkoff, funding rice research and extension. The board · Verified 2026-08-26
California Rice Research Board. The California checkoff, whose state grows the short- and medium-grain varieties closest to sake rice. The board · Verified 2026-08-26
The Rice Foundation. The US rice industry's 501(c)(3) research and education arm. The Foundation · Verified 2026-08-26
Pennsylvania Malt and Brewed Beverage Industry Promotion Program. The one US public funder in this directory whose scope is brewing itself rather than a crop — it appears on the internal and external enzyme pages for exactly that reason. Sake is a brewed beverage; we found no koji or sake award under it. Program page · Verified 2026-08-26
United Sorghum Checkoff Program. The national producer-funded sorghum board. The two studies making the gluten-free case for koji are sorghum studies, funded from Mexico rather than by the US sorghum industry. Sorghum Checkoff · Verified 2026-08-26
— Japanese national programmes —
Japan Society for the Promotion of Science (JSPS) — the KAKENHI programme. The single most frequent funder in koji-mould science: four separate grant numbers appear in the work indexed on this page alone. Example grant · Verified 2026-08-26
Japan Science and Technology Agency (JST) — the ERATO programme, funding exploratory research at longer horizons than a standard grant. ERATO JPMJER1502 · Verified 2026-08-26
New Energy and Industrial Technology Development Organization (NEDO) — Japan's industrial-technology agency. Its presence marks where koji research crosses from food science into bioprocess engineering. JPNP20011 · Verified 2026-08-26
Noda Institute for Scientific Research — a private Japanese research foundation with roots in the soy-sauce industry, co-funding current A. oryzae cell biology. Acknowledged in · Verified 2026-08-26
Ministry of Finance, Japan — the parent ministry under which NRIB was founded in 1904. Koji science in Japan began as a revenue-protection function of the state, which is unlike anything in the gluten-free field. NRIB history · Verified 2026-08-26
Seamless Technology Transfer Program (Japan) — target-driven R&D funding appearing alongside NEDO on the stirred-fermentation work. Verified 2026-08-26
Only one American entry — USDA-ARS, through the NRRL strain collection — represents money that has actually touched this subject; the rest are funders whose scope plainly covers it and who have not funded it. North America has roughly twenty sake breweries converting a gluten-free grain with grown enzymes, a federal strain collection, six rice-funding bodies and a state brewing-promotion programme — and no public research money aimed at the method. The industry exists without the science, and the money to change that already sits in agencies that fund the grain.
5. Suppliers & Industry — who sells koji spores and who brews with them
Described, never endorsed.
— US brewing: the sake line —
SakeOne — Forest Grove, Oregon. Founded 1997, the first craft sake producer in the United States and the longest-running domestic operation converting a gluten-free grain with grown enzymes. US sake movement · Verified 2026-08-26
moto-i — Minneapolis, Minnesota. Opened 2008; the second of the two early US craft sake producers, and a sake brewpub rather than a production-only brewery. US sake movement · Verified 2026-08-26
Proper Sake Co. — Nashville, Tennessee. Founded 2016. Brews from koji grown in-house from spore stock brought back from Japan and maintained across multiple incubators, and sells that koji on to restaurants across the South — a US brewery that is also a koji supplier. Brewer profile · Verified 2026-08-26
North American Sake Brewery — Charlottesville, Virginia. One of roughly twenty sake breweries in the US and the first in its state. Brewery · Verified 2026-08-26
— US koji and spore supply —
Koji House — Virginia. Small-batch US koji producer supplying chefs and makers; domestic koji supply that does not route through Japan. Producer · Verified 2026-08-26
Amazake Co. — the US amazake specialist, selling finished koji, koji powder and spores. Listed here for the spore and koji supply rather than the beverage. Supplier · Verified 2026-08-26
GEM Cultures — United States, family-owned and operating since 1980. Among the longest-standing US routes to koji and miso starters. Supplier · Verified 2026-08-26
Cultures for Health — United States. Ships koji spores domestically; one of the two suppliers most commonly named for US buyers. Verified 2026-08-26
Shared Cultures — United States. Koji spores with nationwide shipping plus local pickup. Koji spores · Verified 2026-08-26
— The US industrial enzyme lineage —
Parke, Davis & Co. — Detroit, 1895. Contracted by Jokichi Takamine to manufacture and market Taka-Diastase at commercial scale: the earliest commercially produced enzyme in North America, made from koji mould. The American enzyme industry starts here. Koji on the global market · Verified 2026-08-26
Taka-diastase (1894) — the enzyme complex manufactured from A. oryzae that stands as one of the earliest industrial enzyme products anywhere. The bottled enzymes on the external enzymes page descend from koji mould historically, not just biologically. Historical account · Verified 2026-08-26
— International: the tane-koji houses —
The spore trade is old and small. The 2021 Journal of Fungi survey counts six major koji-kin producers in Japan, all more than a century old — a supply structure with no parallel in the enzyme industry, where the equivalent product comes from multinationals.
Higuchi Matsunosuke Shoten — Osaka, established 1855. Produces and sells high-purity koji starter and co-develops seed koji with sake brewers. Company · Verified 2026-08-26
Akita Konno — founded in Kyoto in the Meiji era, later moved to Akita; producing tane-koji since 1910 and now selling into fields beyond brewed foods. Producer list · Verified 2026-08-26
Bio'c (Kojiya Sanzaemon) — Japanese spore house whose rice, barley, black and white koji starters reach Western buyers through resellers — the black and white strains being the shochu organisms rather than the sake one. Product range · Verified 2026-08-26
Novo Nordisk / Novozymes — Denmark. Developed an A. oryzae expression system used to produce industrial enzymes, several of which became commercial products. The same organism that grows on grain in a sake brewery is a production host in an enzyme factory. Expression system · Verified 2026-08-26
Fermentation Culture (EU) — European koji starter supply. Supplier · Verified 2026-08-26
Rice Culture — Australia. Sells all-purpose A. oryzae tane-koji, extending the supply chain to the southern hemisphere. Product · Verified 2026-08-26
In the United States, koji expertise sits in commerce rather than in laboratories — which is why this section is the deepest on the page.
6. Organizations & Events — the trade bodies, institutes, and the field's calendar
— US organizations —
Sake Brewers Association of North America (SBANA) — Washington DC. Founded 2019; a 501(c)(6) trade association and, by its own account, the oldest and largest sake trade body outside Japan, with roughly twenty members. It also maintains a public koji sourcing list — trade infrastructure for grown enzymes that has no equivalent in gluten-free brewing. SBANA · koji sources · Verified 2026-08-26
American Society of Brewing Chemists (ASBC) — United States, founded 1934. Publishes the Journal of the American Society of Brewing Chemists, which carries both koji-on-sorghum papers and the Montana State barley-koji paper, and whose official methods were used to run the malt panel on koji grain. The US body through which this subject reaches brewing science. ASBC · Verified 2026-08-26
Craft Maltsters Guild — United States. Carried the Montana State koji malt research to a maltster audience, which is the route by which this work reaches people who could actually run it. Koji Buzz · Verified 2026-08-26
— US events —
KojiCon — a two-week online conference running mid-February into early March, presented by The Yellow Farmhouse. The only recurring event dedicated to koji technique we have found; its audience is broader than brewing, but the technique it covers is this page's subject. KojiCon · Verified 2026-08-26
American Craft Sake Fest — the US industry's own festival, and the main public gathering of North American producers converting a gluten-free grain with grown enzymes. Festival · Verified 2026-08-26
Japan House Los Angeles — Sake Brewing Series — public programming on craft sake brewing in North America. Series · Verified 2026-08-26
Craft Malt Conference (2019, Montana State) — brought roughly 170 maltsters, growers and brewers to the campus now running koji malt trials. Not a koji event, but the audience the koji work is aimed at. Conference · Verified 2026-08-26
— International —
Brewing Society of Japan — the field's academic society. Formally designated koji mould the national fungus (kokkin) in 2006, and publishes the Journal of the Brewing Society of Japan, where much of the primary koji literature appears. The designation · Verified 2026-08-26
Journal of the Brewing Society of Japan — the standing publication venue for Japanese brewing science, including the koji work that never reaches English-language brewing journals. Archive · Verified 2026-08-26
KojiConnect: Japan — an in-person workshop in Japan run alongside a simultaneous online programme, compressing the traditional three-day koji-making process into a single day. Developed with fermentation interpreter Mutsumi Komune and Manami Auregan. Programme · Verified 2026-08-26
No standard or certification scheme governs koji conversion in brewing anywhere we have looked, and none addresses gluten-free claims made on a grain carrying a live mould.
7. Literature & Datasets — the anchor works, the methods, and the published data
— Koji on a gluten-free grain —
Espinosa-Ramírez et al. (2020), Use of Aspergillus oryzae during
sorghum malting to enhance yield and quality of gluten-free lager
beers. The most direct test of this page's premise in the
literature: koji mould applied during sorghum malting, measured through
malt, wort, fermentation and finished gluten-free lager as separate
outcomes. Open access under CC BY; held in this site's intake register
as INT-20260727-010.
doi:10.1186/s40643-020-00330-w ·
Verified 2026-08-26
Heredia-Olea, Cortés-Ceballos & Serna-Saldívar (2017), Malting Sorghum with Aspergillus oryzae Enhances Gluten-Free Wort Yield and Extract. J. Am. Soc. Brew. Chem. 75:116–121. The earlier study from the same group, and the one that established the yield case: wort from sorghum malt inoculated at 1% A. oryzae yielded 21.5% more than sorghum malt alone and 5% more than barley malt, generating 27% more fermentable carbohydrate and 24% more FAN after double mashing. doi:10.1094/ASBCJ-2017-2481-01 · Verified 2026-08-26
Brito et al. (2025), Barley Koji: Exploring the Effects of Steeping and Fermentation on Malt Quality Parameters. J. Am. Soc. Brew. Chem. The published output of the Montana State programme, and the only US-generated koji-malt paper we have found. Measures moisture, extract, β-glucan, FAN, soluble protein, diastatic power, α-amylase, colour, filtration time, turbidity and pH — a full malt panel run on koji grain, using ASBC official methods. Barley rather than a gluten-free grain, but the method is the transferable part. doi:10.1080/03610470.2025.2612314 · Verified 2026-08-26
Characterization of Unmalted Barley Treated with Aspergillus oryzae (2021). J. Am. Soc. Brew. Chem. 80(4). Koji applied to unmalted grain rather than during malting — the closer analogue to what a gluten-free brewer working with raw sorghum would actually attempt. doi:10.1080/03610470.2021.1978045 · Verified 2026-08-26
Optimizing brewing beer production using Aspergillus oryzae solid-state fermentation of sorghum koji as an adjunct (2023). International Journal of Food Properties. Substitutes 30% of barley malt with sorghum koji, comparing Kinmen waxy sorghum against Australian non-waxy sorghum — and finds the Australian koji low in enzyme activity through the first day. Cultivar matters to koji conversion, which is the same lot-variability problem this site tracks everywhere else. Also reports yellow koji outperforming white on alpha-amylase activity, original gravity and alcohol, and records that koji-only worts were difficult to filter. doi:10.1080/10942912.2023.2270174 · Verified 2026-08-26
— Koji organisms on this directory's grains —
The strongest answer to "is koji relevant to gluten-free brewing" is not that the technique could be imported. It is that these organisms are already documented on our grains — in African sorghum brewing, in millet fermentation, and as amylase producers grown on millet itself.
Sawadogo-Lingani et al. (2021), Sustainable Production of African Traditional Beers With Focus on Dolo, a West African Sorghum-Based Alcoholic Beverage. Frontiers in Sustainable Food Systems. States directly that moulds of Aspergillus, Penicillium, Rhizopus and Geotrichum "are often associated with the malting and brewing processes" of West African sorghum beer. The koji genera are already present in sorghum brewing — uncontrolled, unselected, and undocumented as a conversion strategy. The paper · Verified 2026-08-26
Koji fermentation improves the protein digestibility of sorghum. Koji applied to sorghum for what it does to the protein, not the starch — the proteolytic half of the mould's output, on the grain this site is built around. Sorghum's poor protein digestibility is a long-standing constraint in its own literature. ResearchGate record · Verified 2026-08-26
Fermentation dynamics of millet beverages: microbial interactions, nutritional enhancements, and health implications (2025). Reviews the microbiology of millet beverages and records that microbial phytases — A. oryzae named among the sources — degrade phytic acid during fermentation. A second enzyme class the mould brings that malt does not. PMC11788797 · Verified 2026-08-26
Effect of fermentation time on the physicochemical properties and phenolic composition of malted finger millet beverages. Finger millet malt beverages characterised against sorghum as reference — the measurement baseline any koji comparison on millet would need. PMC11891569 · Verified 2026-08-26
Cason et al. (2020), Bacterial and Fungal Dynamics During the Fermentation Process of Sesotho, a Traditional Beer of Southern Africa. Frontiers in Microbiology. Sequenced the fungal community of a traditional sorghum beer across five fermentation stages in five locations — and put numbers on it: Rhizopus at 25.3% of fungal taxa, Aspergillus at 2.5%, Rhizopodaceae the single largest family. This is the quantified version of the dolo observation. In a traditional sorghum beer, a koji-family mould is not incidental — it is a quarter of the fungal population. The paper · PMC7339052 · Verified 2026-08-26
Bacterial and fungal populations in South African sorghum beer (umqombothi), by full-length 16S amplicon sequencing (2023). World Journal of Microbiology and Biotechnology. A second southern-African sorghum beer characterised by sequencing rather than culture — the method that finds organisms plate counts miss. doi:10.1007/s11274-023-03764-4 · Verified 2026-08-26
— Liquid koji: the same organism, a different vessel —
Koji does not have to be grown on grain. It can be cultured submerged in liquid, and the trade-off between the two methods decides whether this scales.
Masuda et al. (2012), Development of a submerged culture method for high production of acid-stable α-amylase and glucoamylase using Aspergillus kawachii. Journal of the Institute of Brewing. Reached 51 U/mL acid-stable α-amylase and 188 U/mL glucoamylase in submerged culture — both high enough for industrial use. The significance is what it had to overcome: acid-stable α-amylase, the enzyme shochu brewing depends on, is hardly produced in ordinary liquid culture, while solid-state grain culture makes it readily. doi:10.1002/jib.53 · Verified 2026-08-26
Process for producing liquid koji using Aspergillus oryzae (WO2007039990A1). The method as filed intellectual property — liquid koji is an industrialised technique with a patent estate, not a laboratory curiosity. The patent · Verified 2026-08-26
— Buckwheat: fungal fermentation, but not koji —
Production of bioactive peptides from tartary buckwheat by solid-state fermentation (2024). Solid-state fungal and microbial fermentation applied to buckwheat — one of this directory's eight grains — with Aspergillus niger, Poria cocos and edible-medicinal fungi rather than koji moulds. The technique reaches buckwheat; the koji organisms, so far as we can find, have not. PMC11475031 · Verified 2026-08-26
Solid-state fermentation of pearl millet with Aspergillus oryzae and Rhizopus azygosporus (2019). Journal of Food Measurement and Characterization. The koji organism itself, grown on millet — one of this directory's eight grains — alongside a Rhizopus species from the Chinese and Korean starter traditions. doi:10.1007/s11694-019-00277-3 · Verified 2026-08-26
Production of α-Amylase by Aspergillus terreus NCFT 4269.10 Using Pearl Millet (2016). Frontiers in Plant Science. Millet used as the substrate on which a fungus is grown to produce α-amylase. Read against the external enzymes page, this inverts the usual relationship: our grain is not only the thing needing conversion, it can be the feedstock for making the converter. The paper · PMC4870861 · Verified 2026-08-26
Biotransformed pearl millet (Pennisetum glaucum) cv. PUSA-415 using Aspergillus oryzae MTCC 3107. A named, collection-held A. oryzae strain applied to a named millet cultivar — the level of specificity a lot standard would need. ScienceDirect · Verified 2026-08-26
Madilo et al. (2024), Diversity of Production Techniques and Microbiology of African Cereal-Based Traditional Fermented Beverages. Journal of Food Quality. Surveys the microbiology of maize, millet, rice and sorghum beverages, recording Aspergillus and Rhizopus species among the moulds present. doi:10.1155/2024/1241614 · Verified 2026-08-26
Diversity of Filamentous Fungi Isolated From Some Amylase and Alcohol-Producing Starters of India. The Indian starter traditions, characterised for the same amylase-producing fungi that koji, nuruk and jiuqu rely on — a fourth independent lineage. PMC7272576 · Verified 2026-08-26
— The organism itself —
Machida et al. (2005), Genome sequencing and analysis of Aspergillus oryzae. Nature. The reference genome: 37 Mb, 12,074 genes, expanded 7–9 Mb over A. nidulans and A. fumigatus. Everything downstream about strain selection and enzyme yield rests on this. Nature 04300 · Verified 2026-08-26
Genome Sequence of the White Koji Mold Aspergillus kawachii IFO 4308 (2011). Eukaryotic Cell. The shochu organism, sequenced. A. kawachii is an albino mutant of the black koji mould A. awamori, retaining amylolytic activity while hyperproducing citric acid — which holds the mash at low pH and suppresses contamination without refrigeration. doi:10.1128/ec.05224-11 · Verified 2026-08-26
Making Traditional Japanese Distilled Liquor, Shochu and Awamori, and the Contribution of White and Black Koji Fungi (2021). Journal of Fungi 7(7):517. How the two non-oryzae koji species work in practice. doi:10.3390/jof7070517 · Verified 2026-08-26
Koji Starter and Koji World in Japan (2021). Journal of Fungi 7(7):569. The survey of the tane-koji trade — strain selection by growth rate and enzyme production capacity, and the six century-old producers who supply it. doi:10.3390/jof7070569 · Verified 2026-08-26
Traditional and Latest Researches on Aspergillus oryzae and Related Koji Molds (2021). Journal of Fungi 7(12):1075. A review bridging the historical practice and the current molecular work. The review · Verified 2026-08-26
Research advances on sake rice, koji, and sake yeast: A review. The three-input framing this site uses for brewing — grain, conversion, organism — set out for sake, where koji occupies the middle position that malt holds in beer. PMC7382144 · Verified 2026-08-26
— Safety: why this organism and not its relative —
Controlling aflatoxin contamination and propagation of Aspergillus flavus by a soy-fermenting A. oryzae strain (2018). Scientific Reports. A. oryzae is genetically very close to A. flavus, the source of aflatoxin, but carries no record of producing it — the aflatoxin gene-cluster homologs are not expressed even under conditions that trigger them in A. flavus. This paper goes further: the food strain actively suppresses the toxigenic one. doi:10.1038/s41598-018-35246-1 · Verified 2026-08-26
What does genetic diversity of Aspergillus flavus tell us about Aspergillus oryzae? (2010). The comparative-genetics question underneath the safety case, from the US federal research programme on Aspergillus section Flavi — the section that contains both the koji mould and the aflatoxin producer. PubMed 20163884 · Verified 2026-08-26
FDA GRAS Notice 829 — dried biomass of Aspergillus oryzae. The regulatory position in the United States. A. oryzae holds Generally Recognized As Safe status with the FDA on the strength of its food-fermentation history and absence of aflatoxin production. GRAS Notice 829 · Verified 2026-08-26
— Grown enzymes outside the Japanese tradition —
Koji is one branch. Korea and China ferment grain with fungal starters under entirely different names, and the literature rarely crosses.
Comprehensive analysis of fungal diversity and enzyme activity in nuruk, a Korean fermenting starter (2017). Journal of Microbiology. Measured alpha-amylase, glucoamylase and acid protease across 131 strains; Saccharomycopsis fibuligera appeared in 46 of 59 nuruk samples, with Aspergillus and Lichtheimia in more than half. doi:10.1007/s12275-017-7114-z · Verified 2026-08-26
Nile (2015), The nutritional, biochemical and health effects of makgeolli. Journal of the Institute of Brewing. The Korean rice beverage whose saccharification runs on Aspergillus and Rhizopus amylases rather than malt — published in a brewing journal, and still largely unread by brewers. doi:10.1002/jib.264 · Verified 2026-08-26
Isolation and Evaluation of Rhizopus arrhizus Strains from Traditional Rice Wine Starters (Jiuqu). Enzyme activities, antioxidant capacity and flavour compounds from the Chinese starter tradition. PMC11765298 · Verified 2026-08-26
Synergistic Effect of Multiple Saccharifying Enzymes on Alcoholic Fermentation for Chinese Baijiu Production (2020). Applied and Environmental Microbiology. Rhizopus secretes the most abundant glucoamylase in the system; alpha-amylase and glucoamylase from Aspergillus and Rhizopus dominate the daqu enzyme profile. doi:10.1128/aem.00013-20 · Verified 2026-08-26
Effects of six commercially available koji (Chinese Xiaoqu) on ethyl acetate, ethyl lactate and higher alcohols in baijiu brewing. Direct comparison of commercial starters against flavour outcomes — the kind of comparative data the gluten-free field has for no conversion method. PMC10362182 · Verified 2026-08-26
— Enzyme production as an industry —
Optimization and scale-up of alpha-amylase production by Aspergillus oryzae using solid-state fermentation of edible oil cakes (2021). BMC Biotechnology. Solid-state fermentation — the koji method — read as an industrial enzyme-production route on low-cost substrates. doi:10.1186/s12896-021-00686-7 · Verified 2026-08-26
Random mutagenesis of super Koji (Aspergillus oryzae): improvement in production and thermal stability of alpha-amylases for maltose syrup production. Gamma-ray mutagenesis to produce thermostable alpha-amylase strains — strain improvement aimed squarely at the property that matters for high-gelatinization grains. PMC6264608 · Verified 2026-08-26
— The same organism family, treated as hazard —
Sorghum malting science has a substantial literature on suppressing the moulds koji deliberately cultivates. It is the same question approached from the opposite end, and it is where the safety case for grown enzymes has to be made.
Lefyedi & Taylor (2007), Control of the Growth of Coliforms and Moulds in Sorghum Malting by Bacterial and Yeast Cultures. Mould control in sorghum malting achieved by deliberately introducing competing cultures — the inverse technique to koji inoculation. doi:10.1002/j.2050-0416.2007.tb00267.x · Verified 2026-08-26
Tawaba et al. (2012), Optimizing red sorghum malt quality when Bacillus subtilis is used during steeping to control mould growth. A bacterial antagonist used during steeping specifically to stop mould establishing on sorghum grain. doi:10.1002/jib.36 · Verified 2026-08-26
Tola et al. (2022), Fungal Species and Multi-Mycotoxin Associated
with Post-Harvest Sorghum Grain in Eastern Ethiopia. What grows on
sorghum when nobody chooses it — the toxigenic-fungi baseline against
which any deliberate inoculation has to be argued. Open access under
CC BY; held as INT-20260727-008.
doi:10.3390/toxins14070473 ·
Verified 2026-08-26
How the field connects — documented links between the entries above
Every connection carries its own evidence link — no inferred relationships, no speculation.
Koji makes amino nitrogen; a bottle of enzymes cannot. Commercial brewing enzymes are carbohydrases — they cleave starch into sugar and stop there. Koji mould secretes proteases alongside its amylases, and the 2017 sorghum study measured 24% more free amino nitrogen in the koji wort. Gluten-free wort runs chronically FAN-short, which the yeast and fermentation page names as a defining problem of these grains. So the two conversion routes are not substitutes: dosing enzymes buys sugar, growing them buys sugar and the nitrogen the yeast needs. Nothing in the external enzymes catalogue does the second job. The 2017 study · the FAN problem
Sorghum's own polyphenols inhibit sorghum's own amylases — and koji's are not sorghum's. The reason sorghum malt underperforms is not only that it makes less enzyme; its tannins and polyphenols are documented amylase inhibitors, and inhibition runs higher in tannin sorghums. The grain suppresses the very enzymes it produces. Koji's amylases are fungal proteins from a different organism, made by a mould growing in the presence of those same polyphenols. Whether they resist inhibition the way the grain's own enzymes cannot is, so far as we can find, unasked — and it is the sharpest open question this page holds, because it goes to the mechanism behind the whole internal enzymes problem. Sorghum malt amylase survey · polyphenol inhibition
The koji process step happens to solve the gelatinization problem. Sorghum gelatinizes above barley's range — the process and equipment page names this as a core physical constraint, and it is why cereal cooking and high-temperature rests exist in gluten-free brewing at all. Koji requires the grain be steamed before inoculation: the 2023 study soaks 2.5 hours to roughly 35% water uptake, then steams. That step gelatinizes the starch and prepares the substrate for the mould in one operation. A brewer adopting koji does not add a gelatinization step — they already performed it. The 2023 method · the gelatinization constraint
Three traditions independently chose acid as the contamination control. Koji mash pH falls to around 4.5, where acid proteases carry the nitrogen work; A. kawachii hyperproduces citric acid specifically to hold shochu mash low and exclude wild organisms; West African sorghum beers are lactic-soured. Three separate lineages arrived at acidification rather than heat or antimicrobials. This site's sorghum malting pages reach instead for Bacillus subtilis and competing cultures — a fourth answer to the same question, and the only one of the four that does not use pH. A. kawachii genome · dolo review · steeping antagonists
A quarter of the fungal community in a traditional sorghum beer is a koji-family mould. Sequencing of Sesotho across five fermentation stages and five locations put Rhizopus at 25.3% of fungal taxa and Aspergillus at 2.5%. That is not a trace presence — Rhizopus is the same genus carrying the glucoamylase load in Chinese jiuqu. Southern African sorghum brewing and Chinese starter brewing are running overlapping organisms, and neither literature cites the other. Sesotho sequencing · jiuqu Rhizopus
The enzyme brewing needs is the one liquid culture struggles to make. Submerged culture is cheaper and more controllable than growing mould on grain — but acid-stable α-amylase, the enzyme shochu brewing depends on, is hardly produced that way, and it took dedicated method development to reach industrial titres. Solid-state culture on grain makes it readily. The scale-up route that looks obvious on paper is the one that loses the property brewing cares about. Masuda 2012 · the patent estate
The koji genera are already in sorghum brewing. The standing review of West African dolo states that moulds of Aspergillus, Penicillium, Rhizopus and Geotrichum "are often associated with the malting and brewing processes." This is the strongest answer to whether koji is relevant here: the same genera are already present in traditional sorghum brewing — uncontrolled, unselected, and never treated as a conversion strategy. Koji is not a foreign technique being imported into gluten-free brewing. It is the domesticated form of something the sorghum tradition has been doing accidentally for centuries. Dolo review · our traditional fermentation wing
The koji organism has been grown on millet. A. oryzae — the sake and miso mould itself — has been applied to pearl millet in solid-state fermentation alongside Rhizopus azygosporus, and a named collection strain (MTCC 3107) to a named millet cultivar. Two of this directory's eight grains now have documented koji-organism work behind them. Millet SSF · the millet page
Our grain can be the feedstock for the enzyme, not just its target. Aspergillus terreus has been grown on pearl millet specifically to produce α-amylase. That inverts the relationship the rest of this directory assumes: gluten-free grain is normally the thing lacking conversion power and buying it in. Here it is the substrate on which conversion power is manufactured. Millet amylase production · external enzymes
Cultivar changes koji performance, the way it changes everything else here. The 2023 adjunct study found Australian non-waxy sorghum koji low in enzyme activity through its first day where Kinmen waxy sorghum was not. Lot and cultivar variability is the problem this site's lot reporting work exists to address, and it does not disappear when the enzymes are grown rather than bought. The study
Cultivate or suppress: one organism, two doctrines. Sorghum malting science works to keep moulds off the grain — with competing cultures (Lefyedi & Taylor) and with bacterial antagonists during steeping (Tawaba). Koji's entire method is to put a mould on the grain on purpose. The two literatures are about the same organisms and almost never cite each other. Mould control · steeping antagonists · koji on sorghum
The site already held this paper, filed under something else. The koji-on-sorghum study is cited twice in this site's own process pages — for the methodological point that malt and beer outcomes are distinct tests, never for the Aspergillus intervention that is the paper's subject. The evidence for this page was already in the building. Sorghum malt · finished-malt QA
One group, two papers, three years apart. Both studies applying koji to sorghum for brewing came from the same laboratory at Tecnologico de Monterrey — the 2017 wort-yield work and the 2020 finished-lager work, sharing Serna-Saldivar as senior author. This is not a field with independent replication; it is one group, twice. 2017 · 2020
Montana State appears on two of this site's pages, for two reasons. Its malt quality panel is published as a dataset in the internal enzymes directory; the same programme is now running koji trials with A. oryzae and A. luchuensis. An institution that measured native enzyme activity is now testing grown enzyme activity. Koji at MSU
The bottled enzymes descend from this mould, historically. Taka-diastase, manufactured from A. oryzae in 1894, is among the first industrial enzyme products; Novo Nordisk later built an A. oryzae expression system to produce commercial enzymes. The external enzymes page and this one are describing the same organism at different points in its domestication. Taka-diastase · expression system
Japan funds this; we have found no one else who does. Five of the six funders traceable through this page are Japanese — JSPS, JST, NEDO, the Noda Institute, and the Ministry of Finance through NRIB. We have not found a US or European public funder supporting koji conversion for brewing. The organism has a national research infrastructure in one country and effectively none anywhere else. NRIB · JSPS-funded work
Three traditions solved the same problem without malt. Japanese koji, Korean nuruk and Chinese jiuqu all convert starch with fungal amylases grown on grain rather than with germinated barley — and all three run principally on rice, a gluten-free grain. The convergence is documented in three separate literatures that rarely cite one another. Nuruk enzymes · jiuqu Rhizopus · baijiu saccharification
The shochu organism solves a contamination problem this site solves with heat. A. kawachii hyperproduces citric acid, holding the mash at low pH and suppressing wild microorganisms — biological contamination control rather than thermal. Sorghum malting on this site reaches for Bacillus subtilis and competing cultures for the same purpose. A. kawachii genome · steeping antagonists
The one US koji programme is published, and it used our own measurement language. Montana State's barley-koji work ran a full malt panel — diastatic power, α-amylase, FAN, filtration time — under ASBC official methods, and reached the Journal of the ASBC in 2025. That matters beyond koji: it means grown-enzyme grain can be characterised with exactly the instruments the testing and certification wing already tracks, and reported in the terms a lot standard would use. The paper · the programme
Checkoff money is one step away from this. The Montana koji work was promoted by the state's wheat and barley committee under a checkoff banner, and a commercial miller pearled its grain. Producer checkoffs fund grain research across this directory — sorghum, rice, corn — which makes them the nearest realistic US funding route for a gluten-free koji trial, and the sorghum checkoff has not taken it. Montana article · Sorghum Checkoff
A US brewer can already get the strain, federally. The NRRL Culture Collection at USDA-ARS Peoria holds roughly 93,000 characterised microbial strains and distributes to more than forty countries. Whatever else is missing from the US picture, strain access is not — the infrastructure a gluten-free brewer would need to start already exists and is public. NRRL collection · catalog
Federal attention is on the dangerous cousin, not the useful one. Both USDA-ARS laboratories on this page study A. flavus and aflatoxin — New Orleans on the flavus–corn interaction, Peoria on mycotoxin prevention. The US government studies the organism koji brewers must distinguish themselves from, and not koji itself. That shapes what a gluten-free certifier would find if they went looking. New Orleans project · the distinction
The industry exists without the science, and that is unusual here. Every other wing of this directory maps fields where research leads and commerce follows. Koji in North America inverts it: roughly twenty sake breweries, a trade association with a koji sourcing list, domestic spore suppliers — and no US public research funding we could find. A gluten-free brewer seeking expertise should call a brewery, not a university. SBANA · the one federal funder
Montana State sits on both sides of the conversion question. Its malt quality panel appears as a dataset in the internal enzymes directory — native enzyme activity, measured. Its barley programme now runs koji trials with A. oryzae and A. luchuensis. One US institution is measuring what the grain makes and testing what a mould could add. Koji at MSU
The craft malt route is the realistic one. The Montana koji work reached practitioners through the Craft Maltsters Guild, and the same lab provides third-party malt analysis to craft maltsters. If grown enzymes ever arrive in gluten-free brewing, this is the documented channel — maltsters, not brewers, and not enzyme vendors. Guild coverage · the lab
Two 1890s facts about the same mould, on two of our pages. Takamine isolated the A. oryzae enzyme complex and Parke, Davis of Detroit manufactured it from 1895 — the first commercial enzyme in North America. The external enzymes page opens on an industry whose first product came from the organism this page is about. Koji on the global market
A brewery that propagates its own conversion agent. Proper Sake grows koji from maintained spore stock and sells it onward. Contrast the gluten-free model documented on this site, where conversion power is purchased per batch from a multinational and its activity is not disclosed on the lot — the problem the testing and certification wing exists to chase. Brewer profile
Sake is the commercial proof, and it is already gluten-free. An entire industry converts a gluten-free grain with grown enzymes and has done for centuries — rice, water, yeast, koji, no barley. North America has around twenty sake breweries and a trade association. The technique gluten-free brewing is asking about is not experimental; it is only unproven on sorghum. The sorghum research
The American enzyme industry began with this mould. Jokichi Takamine isolated the A. oryzae enzyme complex and contracted Parke, Davis & Co. of Detroit in 1895 to manufacture Taka-Diastase — the first commercially produced enzyme in North America. The bottled enzymes on the external enzymes page are the industrial descendants of the organism on this one, and the descent is American, not only Japanese. Koji on the global market · Taka-diastase
A brewery that is also a spore house. Proper Sake Co. grows its koji from stock brought back from Japan, maintains it across incubators, and sells it on to restaurants. Vertical integration of the conversion agent is normal in this field and has no parallel in gluten-free brewing, where conversion power is bought in a bottle from a multinational. Brewer profile · the bottled alternative
Twenty US breweries, and no US research funding. North America has roughly twenty sake breweries and a trade association with a koji sourcing list, while every traceable funder of koji science on this page is Japanese. The United States has the industry and not the science; a gluten-free brewer looking for domestic expertise will find it in a brewery, not a laboratory. SBANA · koji sources
Domestic koji supply now exists. Koji House in Virginia, Proper Sake in Nashville and Amazake Co. sell koji or spores inside the United States. The dependency on six century-old Japanese houses is no longer absolute — which matters for anyone assessing whether this conversion route could be sourced reliably. Koji House · Amazake Co.
Rice is solved; sorghum is not. Sake demonstrates grown-enzyme conversion of a gluten-free grain at commercial scale over centuries. The two sorghum studies show it works there too. Nobody has carried it across, and that single step is the whole gluten-free brewing question this page exists to track. Sake koji research · sorghum koji
Side streams are the next substrate, and this site has one. Copenhagen's 2026 work runs koji on cereal and oilseed processing residues rather than whole grain. Gluten-free brewing generates its own residue stream in spent grain, and the process and equipment page has no answer for it. Side-stream study
The organism is regulated; the practice is not. A. oryzae holds FDA GRAS status, so the input is cleared. But we have found no standard, scheme or trade body governing koji conversion in brewing anywhere — including for gluten-free claims, where testing and certification would have to reckon with a live mould on the grain. GRAS Notice 829
Two pages on this site describe the same organism at different stages of domestication. A. oryzae is a production host in an enzyme factory and a live culture on a brewery's grain. Internal enzymes come from the grain, external from a bottle, grown from a mould — but the bottle's contents and the mould are, in the industrial case, the same species. Expression system · external enzymes · internal enzymes
Filterability is the process warning, and it is already published. The 2023 sorghum-koji adjunct study records that koji-only worts were difficult to filter. Sorghum brewing already has no husk and therefore no natural filter bed — the two problems compound, and anyone reading this page before running a trial should know that. The study · lautering without husk
The safety case has to clear a documented baseline. Post-harvest sorghum in Eastern Ethiopia carries diverse fungi and multiple mycotoxins. Any argument for deliberate inoculation runs through that finding rather than around it — A. oryzae has to be distinguished from what already grows there uninvited. Fungal and mycotoxin survey
Research gaps — where the field's coverage runs out
A gap this page opened with, and the search closed. This section previously read that we had found no published work applying koji conversion to a gluten-free brewing grain. The first pass through this site's own material disproved it: Espinosa-Ramírez et al. (2020) applied Aspergillus oryzae to sorghum malting and measured it through to finished gluten-free lager. The claim is recorded here as corrected rather than quietly deleted.
The grain sweep, stated plainly. We searched for koji or koji-organism work on each of this directory's eight grains. Sorghum has three studies and a documented presence of the genera in traditional brewing. Millet has three. Rice is the tradition's home grain and needs no argument. Buckwheat has solid-state fungal fermentation work — now indexed above — but with Aspergillus niger, Poria cocos and edible-medicinal fungi rather than koji moulds. For teff, fonio, quinoa and amaranth we found no koji study at all — four of eight grains with nothing, which is a real boundary on how far this page's relevance currently reaches.
What the search did not find. Across this site's content we have found no mention of amazake, makgeolli, nuruk, jiuqu, Rhizopus, Monascus, tempeh, miso, or solid-state enzyme production — the vocabulary of the koji field is almost entirely absent. That is a statement about this site's coverage, not about the world's; the external pass will establish what exists beyond it.
The gap is sorghum, not commercialisation. An earlier draft of this section claimed no gluten-free commercial product used grown enzymes. That was wrong on its own terms: sake is rice, rice is gluten-free, and sake is grown-enzyme conversion at commercial scale with a US industry behind it. The real gap is narrower and more useful — koji conversion is commercially proven on rice and demonstrated in research on sorghum, and nobody has carried it commercially from the one grain to the other.
Where the thin edge genuinely looks thin. Our internal material carries one study applying koji to one gluten-free grain. Whether that is the field's whole extent, or only the extent of what we have gathered, is exactly what remains to be established — and until it is, this page states the smaller claim.
Work with koji, or brew with it? Entries are added on merit once verified — tell us about it.
Entries are added as they are verified, never to pad the count. A listing here is a map reference, not a citation. Corrections welcome — see Contact.