Distilling Research Directory
This is the one wing in the family that maps a field which is not gluten-free brewing. It earns its place because the overlap is mechanical rather than thematic: distillers work the same grains this directory maps — sorghum, rice, corn, millet — and face the same conversion problem, with the same tools. Where brewing treats enzyme dosing as proprietary, distilling literature and supplier documentation discuss it in the open, which makes it one of the better sources for questions this site has open.
The boundary is worth stating plainly, because it is easy to blur. A distillate is not a beer, and nothing on this page is guidance for brewing. Gluten claims work differently for distilled spirits than for beer, and this page maps a neighbouring industry's knowledge rather than importing its conclusions.
Whether this belongs in the family at all is a live question. It maps a subject the grain pages cannot hold, which is the family test — but it is an adjacent industry rather than a gluten-free brewing subject, and a reasonable reading says it should be evidence inside the enzyme pages instead of a wing. Published for that decision rather than ahead of it.
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 is US-centered by design, with international anchors where the practice is foundational.
Directory established 2026-08-25 · populated 2026-08-26 from this project's trade archive and an external research pass.
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.
Start here — the asymmetry. Spirits distilled from gluten grains may be labeled gluten-free; beer fermented from them may not. Beer has the measurement literature; spirits have almost none. Permission and proof sit on opposite sides of the same line (How the field connects, Research gaps, Literature).
Who actually wrote the gluten-free grain science — the Heriot-Watt and Scotch Whisky Research Institute series on germination temperature and proteolysis across sorghum, millet, rice and buckwheat (Institutions, Contributors, Literature).
Cultivar to flavor, answered for sorghum — the baijiu literature relating sorghum variety and grain quality to fermentation microecology and finished flavor, which is the study gluten-free brewing says it does not have (Contributors, Projects, Literature, How the field connects).
Cultivar to yield, answered for wheat — multi-environment variety trials reporting alcohol yield stability (Literature, How the field connects).
Where the two supply chains meet and part — shared enzymes, malt and equipment; barrels and analytical labs on the distilling side alone (Industry & Supply Chain).
Koji as a proven commercial conversion route — shochu and awamori, made at scale from rice by grown enzymes (Contributors, Literature).
The rules that cover both industries — TTB Ruling 2020-2 and the FDA's treatment of distilled foods, including the manufacturing-practice caveat that makes gluten status a process question (Institutions, Literature, How the field connects).
1. Institutions — the distilling schools, labs and research centers
US coverage first, then the international anchors — which in this field carry most of the research weight, and are named for that reason rather than for completeness.
— US —
United States Alcohol and Tobacco Tax and Trade Bureau (TTB). Not a research institution, but the body that decides what a spirit may be called and what a gluten statement may say. Its Ruling 2020-2 governs gluten content statements across wine, distilled spirits and malt beverages — the single document that treats this page's subject and this site's subject under one rule. Distilled spirits at TTB · Ruling 2020-2 · Verified 2026-08-26
James B. Beam Institute for Kentucky Spirits, University of Kentucky. Established 2019 on a $5 million gift from Suntory Global Spirits, with a later strategic partnership reported at $9.3 million; its distillery and maturation facility opened in August 2023 and is described as the world's largest teaching distillery. It serves as the bourbon industry's research and development arm, spanning engineering, chemistry, horticulture, food science and public health, and offers third-party testing and long-term experimental systems to industry. The nearest thing in the US to what Heriot-Watt is in the UK. The institute · research · the partnership · Verified 2026-08-26
Kentucky State University. Runs an undergraduate Certificate in Fermentation and Distillation, an 1890 land-grant institution placing distillation training inside an agricultural college — which is the structural position a gluten-free grain programme would need. The certificate · Verified 2026-08-26
Oregon State University — Fermentation Science. One of the few US fermentation science programmes covering the biological, chemical and physical foundations across beer, wine and other ferments. The programme · Verified 2026-08-26
Western Kentucky University and Central Washington University. Two further US institutions offering brewing and distilling qualifications — recorded to show the teaching layer exists across several states, not only in Kentucky. WKU · CWU · Verified 2026-08-26
— The research centers —
International Centre for Brewing and Distilling, Heriot-Watt University. Edinburgh. By its own account the only organisation in the UK offering both Honours and Masters degrees in brewing and distilling, with degrees recognised by the Chartered Institute of Brewers & Distillers. It matters to this directory for a specific reason: the germination-temperature proteolysis work on sorghum, millet, rice and buckwheat — the studies this directory already relies on for gluten-free malting — came out of this centre, with Scotch whisky research funding alongside it. The centre · the sorghum and millet study · the rice and buckwheat study · Verified 2026-08-26
The Scotch Whisky Research Institute (SWRI). Edinburgh. Two of its researchers, J.M. Brosnan and T.A. Bringhurst, are co-authors on both gluten-free grain proteolysis papers above. The practical consequence is worth stating plainly: a meaningful share of the published science on malting sorghum, millet, rice and buckwheat was produced by, or alongside, the Scotch whisky research establishment. SWRI · the studies · Verified 2026-08-26
The Chartered Institute of Brewers & Distillers (CIBD). Formerly the IBD. Its Journal of the Institute of Brewing carries much of this directory's enzyme and process literature, and it recognises the Heriot-Watt degrees above. The professional body that treats brewing and distilling as one discipline — which is the premise of this page. The institute · IBD · Verified 2026-08-26
USDA-ARS Center for Grain and Animal Health Research, Manhattan, Kansas. The federal centre housing the Grain Quality and Structure Research Unit — sorghum protein and grain-quality chemistry, and the closest US federal capacity to this page's grain question. The centre · the grain quality unit · Verified 2026-08-26
Kansas State University. Manhattan, Kansas — co-located with the ARS grain centre above, in the heart of US sorghum production. The land-grant institution nearest this directory's central grain. K-State · Verified 2026-08-26
The Scotch Whisky Association. The industry body behind much of the research funding that reaches Heriot-Watt and SWRI, and the standards authority for the category. The association · Verified 2026-08-26
— The sorghum-spirits research complex —
China's baijiu industry is the largest sorghum fermentation enterprise on earth, and it supports a research literature to match. Indexed here because it studies this directory's central grain at industrial scale.
Jiangnan University. Wuxi, China. Hosts the National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing, the State Key Laboratory of Food Science and Technology, and a Ministry of Education key laboratory in industrial biotechnology. It is the institutional centre of gravity for the world's largest sorghum fermentation research effort — and the counterpart to Heriot-Watt on the other side of the world. The university · the jiuqu enzyme work · Verified 2026-08-26
The baijiu research groups. Chinese food-science and microbiology institutions publishing continuously on sorghum variety, sorghum quality, fermentation microecology and flavor formation in baijiu. Individual institutional affiliations vary by paper and are cited with each entry in Literature rather than consolidated here, because we have not verified a stable institutional map. Sorghum variety and flavor · sorghum quality · Verified 2026-08-26
2. Contributors — the researchers and distillers behind the work
Listed for published work. Several of these names already appear on this directory's enzyme and process pages — they are indexed again here for the distilling half of the same careers.
— The gluten-free grain malting group —
R.C. Agu. The most consequential name on this page for a gluten-free brewer. His published work runs from Nigerian white and yellow malted sorghum varieties mashed with external enzymes (1995) to the 2012 germination-temperature studies on rice and buckwheat — three decades on exactly the conversion problem this site documents, carried out largely inside distilling research. Already indexed on external enzymes, internal enzymes and process and equipment. The 1995 sorghum paper · the 2012 rice and buckwheat paper · Verified 2026-08-26
J.M. Brosnan and T.A. Bringhurst — Scotch Whisky Research Institute. Co-authors on both gluten-free grain proteolysis papers. Neither name appears anywhere else in this directory, which is itself the finding: the whisky research establishment's contribution to gluten-free grain science has been sitting uncredited in our own citations. Sorghum and millet · rice and buckwheat · Verified 2026-08-26
Yuki Chiba, John H. Bryce and Vincent Goodfellow — Heriot-Watt. Co-authors across the same series, and already indexed on homebrew and home malting for the germination-temperature finding. The study · Verified 2026-08-26
G.H. Palmer. Malting science across barley and non-barley cereals, co-author with Agu, Brosnan and Bringhurst on the diastatic-power work. Already indexed on this directory's enzyme pages. The 2007 paper · Verified 2026-08-26
J.S. Swanston and colleagues. Authors of the study on stability of grain and alcohol yield across environments in soft wheat varieties grown for grain distilling — the cultivar-to-yield question, answered for the gluten grain, which is the answer this directory's sorghum pages still lack. The study · Verified 2026-08-26
— Distilling yeast and fermentation —
R. Hansen, S.Y. Pearson, P.G. Meaden and D.J. Jamieson, with J.M. Brosnan. Authors of the proteomic analysis of a distilling strain of Saccharomyces cerevisiae through an industrial grain fermentation — yeast physiology measured in a working distillery rather than a pilot plant, and a companion to the yeast work this directory maps on yeast and fermentation. The study · Verified 2026-08-26
L.S. Boeira, J.H. Bryce, G.G. Stewart and B. Flannigan. Authors of the study on how combinations of Fusarium mycotoxins — deoxynivalenol, zearalenone and fumonisin B1 — affect the growth of brewing yeasts. The mechanistic link between the mycotoxin literature this directory indexes on homebrew and home malting and what actually happens in a fermenter. Stewart is one of the best-known names in brewing science. The study · Verified 2026-08-26
— Barley genetics and enzymes, from the distilling side —
M.E. Looseley, L. Ramsay and colleagues, with J.S. Swanston. Authors of the association-mapping study of malting quality traits across UK spring and winter barley cultivar collections — cultivar genetics mapped to malting quality at population scale. The study · Verified 2026-08-26
G.J. McDougall, H.A. Ross and H.V. Davies, with Swanston. Showed that limit dextrinase from germinating barley has endotransglycosylase activity, explaining its activation by maltodextrins — enzyme mechanism underneath the conversion this directory tracks. The study · Verified 2026-08-26
Y. Stahl, S. Coates and P.C. Morris, with Bryce. Downregulated the barley limit dextrinase inhibitor and changed starch granule size distribution, starch composition and amylopectin structure — the starch-structure lever, pulled genetically. The study · Verified 2026-08-26
— The baijiu flavor and microbiology researchers —
G. Zhang, J. Tang, C. Liu and colleagues. Authors of the 2026 study on sorghum variety effects on fermentation microecology and flavor characteristics in sesame-flavor baijiu. The study · Verified 2026-08-26
M. Han, W. Li and colleagues. Authors of the study tracing sorghum quality through to flavor in light-flavor baijiu via the fermented grain's physicochemistry. The study · Verified 2026-08-26
M.K. Liu, Y.M. Tang and colleagues. Authors of the study on microbiological heterogeneity across four representative sorghum varieties in strong-flavor baijiu fermentation. The study · Verified 2026-08-26
— Koji-converted spirits —
K. Hayashi, Y. Kajiwara, T. Futagami and colleagues. Authors of the standing review of shochu and awamori production and the contribution of white and black koji fungi — the same organisms this directory maps on koji and grown enzymes, working in distilling. The review · Verified 2026-08-26
3. Projects & Grants — funded work in flight right now
What qualifies: work currently funded or actively producing output, concerning gluten-free grain conversion in distilling, with a public record.
USDA-ARS Grain Quality and Structure Research Unit, Manhattan, Kansas. Federal intramural research on sorghum grain composition and protein chemistry — the unit whose scientists this directory already indexes on sorghum and internal enzymes. It is the US federal capacity closest to this page's grain question, and the distinction matters: ARS is intramural, so it is a collaborator through cooperative agreements rather than a body you apply to for money. The unit · Verified 2026-08-26
The Heriot-Watt and SWRI gluten-free grain malting series. A completed programme rather than one in flight: four papers between 2007 and 2014 covering germination temperature and proteolysis in sorghum, millet, rice and buckwheat, plus diastatic power and cultivar-to-alcohol yield. Indexed as a project because it is the single most coherent body of work on this directory's grains, and because it stopped. Sorghum and millet · rice and buckwheat · Verified 2026-08-26
The WDSC technical programme, as a rolling research venue. The Worldwide Distilled Spirits Conference runs a three-day technical programme of oral presentations and posters from industry, suppliers and academia. It is where distilling research surfaces before, and sometimes instead of, journal publication — which makes it a place to look for work that a literature search will miss. WDSC 2026 · Verified 2026-08-26
The James B. Beam Institute research programme. A standing, industry-funded research operation with a working teaching distillery, maturation facility, third-party testing service and long-term experimental systems — the most substantial US distilling research capacity we have found, and the one most plausibly able to run a gluten-free grain trial if asked. Research at the institute · Verified 2026-08-26
Kentucky State University's fermentation and distillation programme. An undergraduate certificate developed with research opportunities attached, inside an 1890 land-grant agricultural college. Coverage of its federal funding record is referenced in public listings we could not verify to house standard, so the programme is indexed and the funding is not. The certificate · Verified 2026-08-26
The baijiu sorghum-variety programme, as a body of work. Not one funded project but a continuous output: papers on sorghum variety, sorghum quality and cultivar-driven microbial heterogeneity appearing across Food Research International, International Journal of Food Microbiology and related journals through 2023–2026. It is the only active research line we have found that systematically relates sorghum cultivar to finished-beverage flavor. 2026 variety and flavor · 2026 grain quality · 2023 four varieties · Verified 2026-08-26
We have not verified the funding behind these papers. Chinese institutional and provincial grant acknowledgements are stated in the articles themselves; we have not read them to house standard and do not list funders we have not checked.
No US-funded distilling project on gluten-free grain conversion has been found. That is a documented absence for this pass, not a settled one — the search here was narrower than on the grain pages.
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 NIFA — Agriculture and Food Research Initiative (AFRI). The federal competitive programme whose food-science and plant-products priority areas cover fermentation and grain quality research. The route a US academic distilling project on gluten-free grain would most plausibly take. AFRI · Verified 2026-08-26
USDA NIFA — Small Business Innovation Research (SBIR). Federal R&D funding for small businesses in food and agriculture. A craft distillery developing a gluten-free grain process is the eligible shape here, as a small business rather than an academic applicant. USDA SBIR · Verified 2026-08-26
USDA Agricultural Research Service. Not a grant-making body — ARS is USDA's intramural arm, doing research in its own laboratories with its own scientists. It appears here because its Grain Quality and Structure Research Unit is the federal capacity on sorghum grain quality, and because collaboration with ARS runs through cooperative agreements rather than an application for funds. Worth knowing before anyone prepares one. ARS · the grain quality unit · Verified 2026-08-26
USDA SARE. Producer-facing grants for on-farm trials, at a scale a grower could use to test malting or distilling varieties. Indexed here as it is on this directory's homebrew page, with the same caveat: the applicant has to be a producer. SARE grants · Verified 2026-08-26
USDA Value-Added Producer Grants. Planning and working-capital funding for producers adding value to a raw commodity. Distilling a grain is value addition in the programme's own terms. The programme · Verified 2026-08-26
— Industry —
Suntory Global Spirits. Funded the James B. Beam Institute with a $5 million founding gift in 2019 and a later strategic partnership reported at $9.3 million. A single corporate donor built the largest US academic distilling research capacity — which is a different funding model from the federal and checkoff routes this directory maps elsewhere, and a faster one. The partnership · Verified 2026-08-26
United Sorghum Checkoff Program. The US producer-funded body for sorghum research, promotion and market development. Its scope covers new uses for the grain, and distilling is a named end market for sorghum. This project's own archive records a proposal put to the Checkoff for gluten-free sorghum beverage development — indexed here as evidence the route is real and has been walked, not as a funded outcome. The Checkoff · National Sorghum Producers · Verified 2026-08-26
The Scotch whisky industry, as a research funder. Heriot-Watt's centre records substantial financial support from the brewing and distilling industries, and SWRI researchers co-authored the gluten-free grain work indexed on this page. An industry funding programme that has already paid for research on this directory's grains, without that being its purpose. The centre · SWRI · Verified 2026-08-26
Thin, and honestly so. The distilling industry funds a great deal of research; almost none of it is aimed at the gluten question, because distilling does not have a gluten question — see the gaps below.
5. Industry & Supply Chain — the distilleries and the suppliers they share with brewing
Described, never endorsed. Nothing here is a recommendation, and a listing is not a supply relationship. The verification questions apply to any purchase.
— Where distilling and brewing buy the same things —
The distilling enzyme and process supply chain. Suppliers serving distilling publish product catalogues covering distilling enzymes, fermentation nutrients, yeast, oak, filtration and analytical services in one document. For a gluten-free brewer the relevance is direct: the same enzyme families this directory maps on external enzymes are sold into distilling, where dose guidance is published rather than treated as proprietary. Gusmer Enterprises · Verified 2026-08-26
Malt, shared across both industries. The craft malting sector sells to brewers and distillers from the same floor, and gluten-free malt houses sit inside that sector. Root Shoot Malting · malthouses that run gluten-free · Verified 2026-08-26
Malt-trade intelligence. The malting industry's trade newsletter, which covers both brewing and distilling demand for the same grains. e-malt.com · Verified 2026-08-26
Distilling yeast and fermentation nutrition suppliers. The yeast trade serves distilling as a distinct product line from brewing, with strains selected for ethanol tolerance and congener profile rather than flavour in the finished ferment. Lallemand Distilling · yeast and fermentation · Verified 2026-08-26
— What distilling buys that brewing does not —
Cooperage and used-barrel supply. The barrel trade is distilling's distinctive input and has no brewing equivalent at scale — though barrel finishing crosses back into beer. Recorded because it is the clearest structural difference between the two supply chains. Northeast Barrel Company · Midwest Barrel Co. · Verified 2026-08-26
Alcohol-beverage analytical laboratories. Independent labs serving wine, beer and spirits producers for compliance and quality testing — the analytical layer a distiller uses where a brewer would use the gluten-testing providers on testing and certification. An alcohol beverage testing laboratory · Verified 2026-08-26
— Equipment —
Shared brewing and distilling equipment suppliers. Vessel, control and process-system suppliers commonly serve both industries, which is why a distillery is a plausible second act for a brewery's capital rather than a separate build. ABE Equipment · Brewmation · Verified 2026-08-26
The used-equipment market. Brewing and distilling plant changes hands through the same listings, which is where a small producer's capital problem is usually solved. BrewBids · Verified 2026-08-26
— The grain side —
US sorghum production and its end markets. The producer bodies that track where sorghum goes, distilling among them — the supply side of this page's central grain. United Sorghum Checkoff · National Sorghum Producers · Verified 2026-08-26
Federal grain quality research as a supply-chain input. The ARS grain-quality unit's work on sorghum protein and composition is what a buyer's specification would ultimately rest on, if one existed. The unit · the lot reporting standard · Verified 2026-08-26
— Trade press —
The spirits and beverage trade press. Whisky Magazine for the category, and beverage-industry publishers covering production, compliance and market movement across beer and spirits together. Whisky Magazine · BevSource · Verified 2026-08-26
This section is drawn in part from this project's own archive of trade correspondence — a working record of who actually sells into this space. Every entry has been verified against the company's public site before listing, and none is a recommendation.
6. Organizations & Events — trade bodies, competitions, and the field's calendar
— US trade and professional bodies —
American Distilling Institute (ADI). The US craft-distilling trade body, running an annual conference and a spirits judging programme — the craft sector's central meeting. ADI · the conference · Verified 2026-08-26
American Craft Spirits Association (ACSA). The US trade association representing craft distillers, with an annual convention and an awards programme. ACSA · Verified 2026-08-26
United States Alcohol and Tobacco Tax and Trade Bureau (TTB). The regulator, indexed in Institutions above and repeated here because it also runs the labeling approval process a distiller actually deals with. TTB · Verified 2026-08-26
— International professional bodies —
Chartered Institute of Brewers & Distillers. Professional qualification and journal publication across both industries. CIBD · IBD · Verified 2026-08-26
Distilled Spirits Council of the United States (DISCUS). The US national trade association for distilled spirits producers and marketers — the industry's policy voice, distinct from the craft-sector bodies above. DISCUS · Verified 2026-08-26
— Events —
ADI's annual conference and spirits judging. The US craft-distilling calendar's anchor. The conference · Verified 2026-08-26
Worldwide Distilled Spirits Conference (WDSC). The field's principal scientific conference, organised by the Chartered Institute of Brewers & Distillers and held in Edinburgh — the ninth ran 4–7 May 2026 on the theme Excellence in Science and Innovation, drawing more than 700 delegates, with Heriot-Watt opening the programme. Technical presentations and posters span sensory science, sustainability, emerging technologies and workforce capability. Both organising institutions are already indexed on this page. WDSC 2026 at CIBD · the conference site · Heriot-Watt's account · Verified 2026-08-26
James B. Beam Institute Industry Conference. The US academic distilling calendar's counterpart, run by the institute indexed in Section 1. The conference · Verified 2026-08-26
World Whiskies Awards. The category's international competition, run by the Whisky Magazine publisher. The awards · Verified 2026-08-26
We have found no distilling event or competition category dedicated to gluten-free spirits. That is unsurprising rather than notable — as the gaps below record, the category does not exist in the way it does for beer, because the regulator does not require it to.
7. Literature & Datasets — the anchor works, the methods, and the published data
— The gluten-free grain malting series (Heriot-Watt and SWRI) —
Chiba, Bryce, Goodfellow, MacKinlay, Agu, Brosnan, Bringhurst & Harrison (2012), Effect of germination temperatures on proteolysis of the gluten-free grains sorghum and millet during malting and mashing. J Agric Food Chem 60(14):3745–3753. Indexed on this directory's homebrew page for its germination finding; indexed here for its authorship, which is half distilling. PubMed 22440185 · Verified 2026-08-26
Agu, Chiba, Goodfellow, MacKinlay, Brosnan, Bringhurst, Jack, Harrison, Pearson & Bryce (2012), Effect of germination temperatures on proteolysis of the gluten-free grains rice and buckwheat during malting and mashing. J Agric Food Chem 60(40):10147–10154. The companion paper, covering the two grains the first did not — and absent from this directory until now. PubMed 22950683 · Verified 2026-08-26
Agu, Okenchi, Aneke & Onwumelu (1995), Brewing properties of Nigerian white and yellow malted sorghum varieties mashed with external enzymes. World J Microbiol Biotechnol 11(5):591–592. Sorghum variety, external enzymes, and brewing properties — in 1995. PubMed 24414919 · Verified 2026-08-26
Agu, Brosnan, Bringhurst, Palmer et al. (2007), Influence of corn size distribution on the diastatic power of malted barley. J Agric Food Chem 55(9). Grain physical uniformity against enzyme development — the distilling-side version of a question this directory's malt pages raise. PubMed 17394341 · Verified 2026-08-26
— Distilling yeast, and what impairs it —
Hansen, Pearson, Brosnan, Meaden & Jamieson (2006), Proteomic analysis of a distilling strain of Saccharomyces cerevisiae during industrial grain fermentation. Appl Microbiol Biotechnol 72(1):116–125. Yeast protein expression tracked through a real industrial grain fermentation. PubMed 16820951 · Verified 2026-08-26
Boeira, Bryce, Stewart & Flannigan (2000), The effect of combinations of Fusarium mycotoxins (deoxynivalenol, zearalenone and fumonisin B1) on growth of brewing yeasts. J Appl Microbiol 88(3):388–403. The missing mechanism behind this directory's mycotoxin finding: these toxins do not merely ride along in the grain, they act on the organism doing the fermenting. PubMed 10747219 · homebrew and home malting · Verified 2026-08-26
— Barley genetics and starch enzymes —
Looseley, Ramsay, Bull, Swanston et al. (2020), Association mapping of malting quality traits in UK spring and winter barley cultivar collections. Theor Appl Genet 133(9):2567–2582. Cultivar genetics against malting quality at population scale. PubMed 32506274 · Verified 2026-08-26
McDougall, Ross, Swanston & Davies (2004), Limit dextrinase from germinating barley has endotransglycosylase activity, which explains its activation by maltodextrins. Planta 218(4):542–551. PubMed 14618324 · Verified 2026-08-26
Stahl, Coates, Bryce & Morris (2004), Antisense downregulation of the barley limit dextrinase inhibitor modulates starch granule size distribution, starch composition and amylopectin structure. Plant J 39(4):599–611. Starch architecture altered at the gene, with measurable consequences for granule size and amylopectin. PubMed 15272877 · Verified 2026-08-26
Moralejo, Swanston, Muñoz et al. (2004), Use of new EST markers to elucidate the genetic differences in grain protein content between European and North American two-rowed malting barleys. Theor Appl Genet 110(1):116–125. Grain protein — this directory's central variable — traced to markers. PubMed 15551038 · Verified 2026-08-26
— Agronomy through to alcohol yield —
Watson, Hare, Kettlewell, Brosnan & Agu (2010), Relationships between disease control, green leaf duration, grain quality and the production of alcohol from winter wheat. J Sci Food Agric 90(15):2602–2607. Field agronomy carried all the way to distillery yield. PubMed 20687235 · Verified 2026-08-26
— A yeast route from traditional fermentation —
Agu, Anyanwu & Onwumelu (1993), Use of high-ethanol-resistant yeast isolates from Nigerian palm wine in lager beer brewing. World J Microbiol Biotechnol 9(6):660–661. Wild yeast taken from a traditional African ferment and put to work in lager — the practice this directory documents on traditional fermentation, published in 1993 by the same researcher who later wrote the gluten-free malting series. PubMed 24420294 · Verified 2026-08-26
— Cultivar to yield, answered for the gluten grain —
Swanston, Smith, Thomas, Sylvester-Bradley et al. (2014), Stability, across environments, of grain and alcohol yield, in soft wheat varieties grown for grain distilling. J Sci Food Agric 94(15):3234–3240. A multi-environment cultivar trial reporting alcohol yield stability. The study design this directory's sorghum pages record as missing, executed for wheat. PubMed 24668758 · Verified 2026-08-26
Kaur, Bhushan, Kashyap, Kocher & Srivastava (2026), Multi-Scale Effects of Wheat Genotypic and Biochemical Variation on Fermentation Efficiency and Distillation Yield of Vodka Distillates. J Food Sci 91(1):e70791. Genotype through to distillate yield. PubMed 41466362 · Verified 2026-08-26
— Sorghum spirits: the baijiu literature —
Zhang, Tang, Liu, Liu, Zhao & Xue (2026), Effects of sorghum variety on fermentation microecology and flavor characteristics of sesame-flavor Baijiu. Food Res Int 242(Pt 4):120161. Cultivar to flavor, for sorghum, at industrial scale. PubMed 42637478 · Verified 2026-08-26
Han, Li, Zhang, Zhang, Zhu & Li (2026), Microbial communities as key drivers: exploring sorghum quality impact on light-flavor Baijiu. Int J Food Microbiol 446:111545. Grain quality traced through fermentation to flavor. PubMed 41317442 · Verified 2026-08-26
Liu, Tang, Liu, Tian, Zhang & Fan (2023), Variation in microbiological heterogeneity in Chinese strong-flavor Baijiu fermentation for four representative varieties of sorghum. Int J Food Microbiol 397:110212. Four sorghum varieties, four microbial outcomes. PubMed 37084618 · Verified 2026-08-26
— Koji-converted spirits —
— Grown enzymes for distilling: the jiuqu literature —
China's distilling starters are the direct analogue of koji: mixed microbial cultures grown to supply the saccharifying enzymes a gluten-free grain cannot. This directory maps that idea on koji and grown enzymes; here it is at industrial scale, on sorghum.
Wang, Wu, Xu & Sun (2020), Synergistic Effect of Multiple Saccharifying Enzymes on Alcoholic Fermentation for Chinese Baijiu. Appl Environ Microbiol 86(8). Multiple saccharifying enzymes acting together rather than a single amylase — the multi-enzyme question this directory's external-enzyme page raises, answered in a distilling context. PubMed 32060021 · external enzymes · Verified 2026-08-26
Kang, Xue, Chen & Han (2022), Integrated multi-omics approaches to understand microbiome assembly in Jiuqu, a mixed-culture starter. Compr Rev Food Sci Food Saf 21(5):4076–4107. The standing review of how these starter communities assemble. PubMed 36038529 · Verified 2026-08-26
Wang, Wang, Shen & Wang (2020), Microbiota stratification and succession of amylase-producing Bacillus in traditional Chinese Jiuqu. J Sci Food Agric 100(8):3544–3553. Amylase-producing bacteria, not just fungi, doing the conversion work — a route this directory's enzyme pages do not currently cover. PubMed 32242927 · koji and grown enzymes · Verified 2026-08-26
Wang, Wu, Xu & Sun (2018), Specific volumetric weight-driven shift in microbiota compositions with saccharifying activity change in starter for Chinese Baijiu fermentation. Front Microbiol 9:2349. A physical parameter of the starter cake changing which organisms grow, and how much saccharifying activity results. PubMed 30323805 · Verified 2026-08-26
— The fermentation environment —
Huang, Liu, Tian & Qiu (2026), Succession of pit mud archaeal communities and metabolic networks. Appl Environ Microbiol 92(5):e0009926. Baijiu's fermentation pits carry their own microbial ecology that accumulates over decades — a form of terroir with no brewing equivalent. PubMed 42007759 · Verified 2026-08-26
Wang, Xiong, Song & Deng (2026), Diversity, community, and function of lactic acid bacteria in the brewing of strong-flavor Baijiu. Foods 15(14):2484. Lactic acid bacteria as functional participants rather than contaminants — the same organisms this directory maps on traditional fermentation. PubMed 42511231 · Verified 2026-08-26
— Koji-converted spirits —
Hayashi, Kajiwara, Futagami, Goto & Takashita (2021), Making Traditional Japanese Distilled Liquor, Shochu and Awamori, and the Contribution of White and Black Koji Fungi. J Fungi 7(7):517. Also indexed on koji and grown enzymes. PubMed 34203379 · Verified 2026-08-26
— The co-product literature —
Lu, Zhang, Zheng, Lv & Jiang (2025), Extraction and application of proteins from distiller's grains: a review. Int J Biol Macromol 319(Pt 3):145633. Where the grain protein goes after distillation — and, notably, the only substantial body of prolamin research connected to distilling. PubMed 40588198 · Verified 2026-08-26
— The regulatory documents —
TTB Ruling 2020-2, Gluten Content Statements in the Labeling and Advertising of Wine, Distilled Spirits, and Malt Beverages. The document that governs both this page's subject and this site's, and draws the line between them. The ruling · FDA vs TTB labeling · Verified 2026-08-26
FDA final rule on fermented, hydrolyzed and distilled foods (2020). Its treatment of distillation is the key passage: distillation is a purification process separating volatile components from nonvolatile material including proteins — with the caveat that carryover can occur under poor manufacturing practice, and that protein testing can confirm its absence. FDA Q&A · testing and certification · 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.
The whole page in one sentence: spirits get the allowance beer is denied, and spirits have none of the evidence. Distilled spirits made from gluten grains may be labeled gluten-free where good manufacturing practice keeps gluten out, because distillation removes gluten in a way regulators accept. Fermented malt beverages get no such allowance. Yet beer is the side with the measurement literature — ELISAs, mass spectrometry, patient serology — and spirits are the side with almost none. The permission and the proof sit on opposite sides of the line. FDA vs TTB labeling · Ruling 2020-2
The Scotch whisky research establishment wrote part of this directory's foundations, uncredited. Brosnan and Bringhurst of the Scotch Whisky Research Institute are co-authors on both gluten-free grain proteolysis papers — sorghum and millet, and rice and buckwheat. One of those studies is cited repeatedly on this directory's homebrew page. Neither name appeared anywhere in this directory until this page existed. Sorghum and millet · rice and buckwheat · SWRI
The cultivar-to-flavor study this directory says is missing has been done — for sorghum, in China, at industrial scale. Our flavour page records that gluten-free grains lack controlled cultivar-to-flavor data. The baijiu literature has exactly that: sorghum variety against fermentation microecology and flavor characteristics, sorghum quality against flavor formation, and four sorghum varieties against microbial outcome. Different beverage, different process, same grain and same question. Variety and flavor · grain quality · four varieties
The cultivar-to-yield trial exists too — for wheat. Swanston's group ran soft wheat varieties across environments and reported the stability of both grain and alcohol yield. That is the study design this directory's sorghum pages describe as absent, executed on the gluten grain because the gluten grain had an industry willing to pay for it. The study · sorghum directory
A single corporate gift built more US distilling research capacity than any public programme. Suntory Global Spirits funded the Beam Institute with $5 million in 2019 and a later partnership reported at $9.3 million, producing the world's largest teaching distillery with third-party testing and long-term experimental systems. Compare that with this directory's homebrew page, which records no funder at all, and its grain pages, where a $150,000 Experiment Station award is a large number. The distilling side's research capacity was bought, quickly, by one company. The partnership · homebrew and home malting
Mycotoxins do not just travel in the grain — they act on the yeast. This directory documents aflatoxins, fumonisin B1 and zearalenone in sorghum malt and traditionally brewed beer. Boeira's group tested combinations of Fusarium toxins against brewing yeast growth directly. That closes the loop between a contaminated grain bed and a fermentation that underperforms, and it was published in a brewing journal in 2000 by a Heriot-Watt group. The study · the mycotoxin literature
The barley cultivar question has been answered at population scale — for barley. Association mapping across UK spring and winter barley collections related cultivar genetics to malting quality; EST markers traced grain protein differences between European and North American two-rowed malting barleys. This directory's sorghum pages record the absence of exactly this work for their grain. The method is mature; only the grain is missing. Association mapping · EST markers · sorghum protein and the missing spec
The palm-wine yeast paper is the same author, twenty years earlier. Agu isolated high-ethanol-resistant yeasts from Nigerian palm wine and used them in lager brewing in 1993, then co-wrote the gluten-free grain malting series in 2012. One career runs from a traditional African ferment to Scotch whisky research to the studies this site depends on — which is a fair description of where gluten-free brewing knowledge actually comes from. 1993 · 2012 · traditional fermentation
Jiuqu is koji's industrial twin, and it works on sorghum. This directory maps grown enzymes as a brewing frontier — koji, an organism cultivated to supply the amylases a gluten-free grain lacks. China's distilling starters do exactly that at national scale, on sorghum, and the research asks the question this site keeps asking: how do multiple saccharifying enzymes act together, and what does the starter's composition do to conversion. The proof of concept this directory calls a frontier has been running commercially for centuries. Multiple saccharifying enzymes · koji and grown enzymes
Bacteria convert starch too, and this directory has not said so. The jiuqu literature documents amylase-producing Bacillus stratifying and succeeding through the starter. Every conversion route this directory maps is either a plant enzyme, a fungal enzyme, or a dosed industrial one. A bacterial route exists, is characterised, and is in commercial use — and appears nowhere in the enzyme wing. The study · internal enzymes
A physical property of the starter changes the enzyme output. Wang's group found that the volumetric weight of the starter cake shifts which microbes dominate and how much saccharifying activity results. That is a process variable with no brewing analogue — closer to how a maltster thinks about a germination bed than to anything in a mash tun. The study · homebrew and home malting
Distilling has terroir that brewing cannot copy. Baijiu's fermentation pits accumulate archaeal communities over decades, and the pit's age reshapes the metabolism and the flavour. A brewery can buy the same malt and the same yeast as its competitor; it cannot buy a sixty-year-old pit. Pit mud succession
Lactic acid bacteria are functional here, not spoilage. Strong-flavor baijiu treats its lactic community as part of the process. This directory's traditional fermentation page documents the same posture in African sorghum beers, and its brewing pages treat lactic organisms mainly as a contamination risk. Two of the three sorghum-fermentation traditions this directory covers count them as an ingredient. The study · traditional fermentation
The two ends of sorghum research have institutional centres and no connection. Heriot-Watt and SWRI in Edinburgh produced the gluten-free grain malting series; Jiangnan University anchors the world's largest sorghum fermentation research effort. Both work on this directory's central grain. We have found no citation running between them, and gluten-free brewing sits downstream of both without drawing on either systematically. ICBD · Jiangnan University
The federal sorghum capacity is in Kansas, and it is intramural. The ARS Grain Quality and Structure Research Unit sits beside Kansas State in the middle of US sorghum country, doing the protein and grain-quality chemistry a malting specification would rest on. It is not a grant body — reaching it means a cooperative agreement, not an application. That distinction decides how a small producer would actually approach the most relevant federal capacity there is. The unit · the lot reporting standard
The distilling yeast trade is a separate product line, selected for different things. Distilling strains are chosen for ethanol tolerance and congener profile; brewing strains for the flavour they leave behind. A gluten-free brewer fighting a low-nitrogen, glucose-forward wort is closer to the distiller's problem than the brewer's, which makes the distilling yeast catalogue worth reading. Lallemand Distilling · yeast and fermentation
The field's research surfaces at a conference before it reaches a journal. WDSC runs a three-day technical programme of presentations and posters from industry, suppliers and academia, organised by the same institute that publishes the Journal of the Institute of Brewing. A literature search alone will miss work that appeared there — which is part of why this page's absence findings are stated as searched rather than settled. WDSC 2026 · CIBD
Distilling publishes enzyme doses; brewing does not. The same enzyme families this directory maps are sold into distilling with published dose guidance in supplier documentation, while the brewing side treats dosing as proprietary. A gluten-free brewer's most useful published dose data may be sitting in a distilling catalogue. External enzymes · Gusmer Enterprises
Agu's career is the bridge, and it ran the other way. Three decades from Nigerian malted sorghum varieties with external enzymes in 1995 to rice and buckwheat proteolysis in 2012 — carried out substantially inside distilling research, and already cited on three of this directory's brewing pages. The knowledge this site needs was developed next door and imported without the address being noted. 1995 · 2012 · external enzymes
Koji converts starch for spirits and for beer, and only one of them has a commercial category. Shochu and awamori are koji-converted distilled beverages made at industrial scale from rice — gluten-free grain, grown-enzyme conversion, commercially proven. This directory's koji page documents the same organisms as a brewing frontier. The review · koji and grown enzymes
The prolamin research attached to distilling is about the leftovers. Every hordein, prolamin and gliadin paper we found connected to distilling concerns distillers' grains as a protein co-product — films, nanoparticles, extraction chemistry. The protein is studied carefully after it has been separated from the drink, and not at all inside it. The review · testing and certification
The regulator's own caveat is the whole risk. The FDA describes distillation as a purification process separating volatiles from proteins — then notes carryover can occur under poor manufacturing practice, and that protein testing can confirm absence. The allowance is conditional on process control, which means a spirit's gluten status is a manufacturing question, not a recipe question. FDA Q&A · the lot reporting standard
One ruling governs both industries, and it is the reason this page exists. TTB Ruling 2020-2 covers wine, distilled spirits and malt beverages in a single document. Reading it is the fastest way to see that the difference between this page's subject and this site's is a process distinction the regulator made, not a category that grew apart naturally. The ruling · gluten-reduced beer is not gluten-free
Research gaps — where the field's coverage runs out
Gaps are documented, not speculated. A documented zero is an answer.
Nobody has measured gluten in distilled spirits. We searched for it four ways in the biomedical literature — gluten against spirit, whisky, whiskey, vodka and gin in title and abstract; hordein, prolamin and gliadin against distillation and spirits; celiac and coeliac against the same beverage terms; and protein carryover into distillate. The results were five, fourteen, six and zero papers respectively, and not one of them measures gluten in a distilled spirit. The fourteen prolamin results are all about distillers' grains as a protein co-product. The regulatory allowance that distillation removes gluten rests on accepted physical principle and manufacturing practice, not on a published measurement literature. Searched 2026-08-26; recorded as a documented absence and gladly withdrawn if shown otherwise. FDA Q&A
The comparison this whole page implies has never been run. Nobody has taken a spirit distilled from barley and a spirit distilled from sorghum and measured them against each other for residual protein or immunogenic peptides. The method exists — this directory's testing page documents mass spectrometry and patient serology applied to beer. It has simply never been pointed at spirits. Testing and certification
The baijiu literature is unread on this side of the language barrier. Over a thousand indexed papers on sorghum fermentation at industrial scale, including the cultivar-to-flavor work gluten-free brewing says it lacks, and we have found no gluten-free brewing source that cites any of it. We are indexing it here having read abstracts, not full texts, and we cannot assess how the findings transfer from solid-state baijiu fermentation to a brewhouse. Variety and flavor
Funding on this page is unverified rather than absent. The baijiu papers carry grant acknowledgements we have not read to house standard, so Section 3 records a body of work without naming who pays for it. That is a gap in our reading, not necessarily in the record.
Two names in this directory point at the wrong scientists. Searching the literature for two of the authors this directory credits returns mostly a veterinary immunologist and a medicinal chemist who share their surnames and initials — roughly forty and twenty papers respectively that are not theirs. We have written the malting entries so the linked paper disambiguates the person, but a reader searching a bare name will land somewhere wrong. Author identifiers rather than initials would fix it, and this directory does not currently carry them.
Whether this page belongs in this family is still open. The page's own introduction says so, and this pass does not settle it. What this pass adds to the argument: the strongest single finding here — that the whisky research establishment authored the gluten-free grain malting science — is an argument for keeping it, because that connection is invisible from inside the brewing pages.
Distill with these grains? 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, and nothing here is brewing guidance. Corrections welcome — see Contact.