Process & Equipment Research Directory
Every constraint on this page is specific to gluten-free brewing rather than borrowed from barley practice. There is no husk, so lautering has no natural filter bed and rice hulls become a process decision rather than an afterthought. Gelatinization temperatures run above barley's, which is why cereal cooking and high-temperature rests exist here at all. And some of these grains are physically tiny — teff and fonio are smaller than a poppy seed — so ordinary mill settings do not apply.
The honest shape of this subject: the academic literature is thin and the practitioner and equipment literature is not. Much of what is known sits in supplier technical notes, brewery experience, and this site's own process pages rather than in journals. This page maps that as it is, rather than implying a research field where one does not exist.
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 engineering is foundational.
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 husk problem — the constraint everything else follows from: no husk means no filter bed, so hulls become a purchased input and false bottoms must be specified to the grain (Equipment & Industry, How the field connects, and this site's rice hull and stuck-mash pages).
Gelatinization and the cereal cook — why these starches need temperatures barley does not: the amylose-content studies (Literature), the ~180°F figure, and the pre-gelatinized adjunct route that avoids the problem in the grist rather than the kettle (Equipment & Industry).
Conversion in the mash — whether the grain can convert itself and what to do when it cannot: Bajomo and Young's raw-sorghum work, the α-glucosidase and β-amylase literature (Literature, Contributors), Penn State's ExGM procedure (Projects), and this site's documented conversion failure (How the field connects).
Milling the small grains — teff and fonio are smaller than a poppy seed and barley settings do not transfer: crush philosophy, grinders versus roller mills, and the endosperm-texture work linking milling to nitrogen downstream (Equipment & Industry, Literature).
Where this knowledge lives — the honest shape of the field: supplier technical notes and brewery experience rather than journals, and what that means for anyone trying to cite it (How the field connects, Research gaps).
1. Institutions — federal labs, universities, and international centers doing the work
Every institution below is here because its work is cited in this page's Literature section — the field mapped from its own output rather than from a list of names.
— Federal laboratories —
USDA-ARS Grain Quality and Structure Research Unit — Manhattan, Kansas. The federal unit whose subject is precisely what this page turns on: grain structure, not grain composition. The Nottingham finding that protein–starch interaction strength governs brewing performance is a structure question, and this is where structure is measured. Our internal enzymes page · Verified 2026-08-26
USDA-ARS Cereal Crops Research Unit — Madison, Wisconsin. Federal cereal-quality capacity, and the source of the malt screening data published on this site. The unit · Verified 2026-08-26
USDA-ARS National Center for Agricultural Utilization Research — Peoria, Illinois. Its remit is converting agricultural commodities into higher-value products — the federal framing of what a brewhouse does to a grain. NCAUR · Verified 2026-08-26
USDA Federal Grain Inspection Service (FGIS). Official sampling and grading at intake — test weight, moisture, damage, foreign material. The first measurement any grain entering this page's equipment receives. Our page · Verified 2026-08-26
— US universities —
Penn State University — Department of Food Science. The funded US gluten-free brewing programme, and the developer of the ExGM decoction mashing procedure: gluten-free malts reaching high fermentable-sugar concentrations without enzyme supplementation. A mash-design answer to a conversion problem. The research · Verified 2026-08-26
Colorado State University. Home of the Muoria, Linden and Bechtel comparison of diastatic power and α-amylase across millet, sorghum and barley — the baseline number this page's conversion problem starts from. Muoria et al. 1998 · Verified 2026-08-26
Montana State University — Barley, Malt and Brewing Quality Lab. Third-party malt analysis for craft maltsters, running the full malt panel — extract, β-glucan, FAN, diastatic power, α-amylase, filtration time, turbidity — that connects malt specification to brewhouse behavior. The lab · Verified 2026-08-26
University of Nottingham. Institutional home of the low-temperature enzyme mashing work — the study that shows sorghum can be converted without reaching gelatinization temperature, and that grain microstructure matters more than protein content. The study · Verified 2026-08-26
— International anchors —
Heriot-Watt University — Edinburgh. The brewing school behind the Agu and Palmer α-glucosidase and comparative-malting work that runs through this page. Agu & Palmer 1997 · Verified 2026-08-26
University of Pretoria — South Africa. Taylor's β-amylase and sorghum-mashing FAN work, and the 125th Anniversary review of tropical cereals in lager brewing. Our sorghum directory · Verified 2026-08-26
University College Cork — Ireland. The Arendt group, whose review of brewing with up to 40% unmalted oats and sorghum sets the adjunct ceiling this page works below. Our internal enzymes page · Verified 2026-08-26
Tecnológico de Monterrey — CB-FEMSA, Mexico. The Espinosa-Ramírez group's work on endosperm texture and the fate of free amino nitrogen through liquefaction — a milling property changing fermentation behavior. Espinosa-Ramírez et al. 2013 · Verified 2026-08-26
Ahmadu Bello University — Zaria, Nigeria. The Nigerian bench behind much of the raw-sorghum brewing literature, in the country with the world's largest commercial sorghum brewing sector. Our internal enzymes page · Verified 2026-08-26
2. Contributors — the researchers and engineers behind the work
— The raw-sorghum conversion line —
M.F. Bajomo & T.W. Young. Authors of the 1993 and 1994 studies establishing that 100% raw sorghum with commercial enzymes yields a fermentable wort, and characterising how it ferments. This site's own enzyme-mash protocols descend from that finding. Mash methods compared · Verified 2026-08-26
C.I. Owuama. Author of Brewing Beer with Sorghum (1999) and Sorghum: a cereal with lager beer brewing potential (1997) — the pair that framed sorghum as a lager grain rather than only a traditional one. doi:10.1002/j.2050-0416.1999.tb00002.x · Verified 2026-08-26
B.N. Okolo and colleagues. Authors of the 2020 work on how malted barley and exogenous enzymes shift the glucose/maltose balance — the sugar-profile question posed as a mash-design decision. The sugar bible · Verified 2026-08-26
— Enzyme development in the grain —
R.C. Agu & G.H. Palmer. The pair behind the 1997 α-glucosidase comparison and the 2013 study malting millet, sorghum and barley at their own optimum germination temperatures. Agu appears on both enzyme wings of this directory. doi:10.1002/j.2050-0416.1997.tb00933.x · Verified 2026-08-26
O.U. Etokakpan & G.H. Palmer. Authors of the 1990 comparison of endosperm-degrading enzyme development in malting sorghum and barley. Our internal enzymes page · Verified 2026-08-26
John R.N. Taylor — University of Pretoria. Author of the 1993 β-amylase study, co-author of the 1986 work on FAN production in sorghum beer mashing, and lead of the 2013 125th Anniversary review. He recurs across this directory; the recurrence is the point. Our sorghum directory · Verified 2026-08-26
H.K. Boyd. Co-author with Taylor on the 1986 sorghum-mashing FAN work — nitrogen treated as a mash output rather than a fermentation input. Yeast nutrition · Verified 2026-08-26
J.K. Muoria, J.C. Linden & P.J. Bechtel — Colorado State. Authors of the 1998 diastatic power and α-amylase comparison across millet, sorghum and barley. doi:10.1094/ASBCJ-56-0131 · Verified 2026-08-26
— Starch structure —
Yanting Sang, Scott Bean, Paul A. Seib, Jeff Pedersen and Yong-Cheng Shi. Authors of the 2008 study on sorghum starches differing in amylose content — the structural basis of the gelatinization problem this page opens on. Bean and Pedersen are USDA-ARS, and Bean also appears on this directory's internal enzymes and sorghum pages. PubMed 18627168 · Verified 2026-08-26
Yang and colleagues (2024). The current cultivar-level treatment of sorghum starch structure and amylose content. Gelatinization · Verified 2026-08-26
— Nitrogen and adjuncts —
Annie Hill & Graham G. Stewart. Authors of Free Amino Nitrogen in Brewing (2019), the reference treatment of the constraint that defines these worts. doi:10.3390/fermentation5010022 · Verified 2026-08-26
Esther Espinosa-Ramírez — Tecnológico de Monterrey. Lead author on the 2013 study tracing free amino nitrogen through liquefaction and fermentation in maize and sorghums of differing endosperm texture. doi:10.1016/j.fbp.2012.08.007 · Verified 2026-08-26
B. Schnitzenbaumer & Elke K. Arendt — University College Cork. Authors of the 2014 review on brewing with up to 40% unmalted oats and sorghum. Our internal enzymes page · Verified 2026-08-26
Darrell Cockburn — Penn State. Principal investigator on the funded gluten-free brewing work and co-developer of the ExGM decoction mashing procedure. Faculty page · Verified 2026-08-26
3. Projects & Grants — funded work in flight right now
What qualifies: funded work a reader could pursue or follow, and the process research currently producing output.
— Active research lines —
The ExGM decoction mashing procedure (Penn State). A modified mashing method reaching high fermentable-sugar concentrations from gluten-free malts without enzyme supplementation, with a provisional patent filed. A process answer to a purchasing problem. The research · Verified 2026-08-26
Gluten-Free Beer Production in Pennsylvania Using Unmalted Grains (Penn State). A $53,514 award to Darrell Cockburn evaluating unmalted gluten-free grains and enzyme supplementation to establish best practice for fermentable sugars and free amino nitrogen. Grant coverage · Verified 2026-08-26
— This site's own process work —
The malt lab mash process for testing. This site's laboratory mash procedure — the bridge between a malt specification and what the brewhouse actually does. The procedure · Verified 2026-08-26
Mash Protocol 3 — the proposed maltose mash. An unproven protocol published as a proposal rather than as practice, with the evidence it would need to become one. The protocol · Verified 2026-08-26
— US funding this work could be taken to —
USDA NIFA — AFRI. Federal competitive funding whose plant-products priority area reaches cereal processing. AFRI · Verified 2026-08-26
USDA NIFA — SBIR/STTR. The small-business route for a maltster or brewery testing a process change. SBIR/STTR · Verified 2026-08-26
Brewers Association — Craft Beer Research and Service Grants. The programme · Verified 2026-08-26
4. Funders & Programs — who pays for it (described, never endorsed)
Described, never endorsed.
— US —
Pennsylvania Malt and Brewed Beverage Industry Promotion Program. Funds the Penn State work on fermentable sugars and free amino nitrogen from unmalted gluten-free grain — the one US public funder pointed directly at this page's central problem. Program page · Verified 2026-08-26
USDA NIFA. Federal competitive agricultural research funding across every grain this page's process problems apply to. NIFA · Verified 2026-08-26
United Sorghum Checkoff Program. The producer board for the grain most of this page's literature concerns; its RFP is paused for 2026 pending evaluation. Research page · Verified 2026-08-26
ASBC Foundation. Funds brewing science including method development. ASBC · Verified 2026-08-26
Brewers Association. Industry research money aimed at beer rather than at a crop. The association · Verified 2026-08-26
USDA NIFA — SBIR/STTR. The small-business route, and the realistic one for a maltster or brewery testing an equipment change rather than a hypothesis. SBIR/STTR · Verified 2026-08-26
SARE — Producer Grants. On-farm and small-producer trial funding, including value-added processing. The lowest-barrier route to testing a process change outside a university. SARE · Verified 2026-08-26
US Department of Energy — Industrial Efficiency programmes. Named here because the low-temperature mash finding is, in energy terms, a 95°C-to-78°C reduction across a heated process. Efficiency funding is scope-eligible for exactly that kind of change, and nobody in this category appears to have used it. The office · Verified 2026-08-26
Foundation for Food & Agriculture Research (FFAR). The public-private agricultural research foundation appearing on this directory's sorghum and corn pages. FFAR · Verified 2026-08-26
— The self-funded layer —
Supplier R&D. This page's framing states it plainly: much of what is known sits in supplier technical notes. That work is funded by the companies producing it, published selectively, and is the largest uncounted funder of process knowledge in gluten-free brewing. External enzymes · Verified 2026-08-26
5. Equipment & Industry — who builds and sells the kit
Described, never endorsed. This page's own framing notes that its field's knowledge sits in supplier technical notes and brewery experience rather than in journals — so on this page, industry is the evidence base, not a vendor list appended to one. The equipment below is organised by where it sits in the process, and each entry states what the gluten-free grain changes about it.
— Grain cleaning and sorting —
Grain cleaners, destoners and aspirators. Standard intake equipment, carrying a gluten-free-specific job: removing foreign grain before it reaches the mill. What arrives as "foreign material" on an FGIS grade may be the thing a gluten claim turns on. Verified 2026-08-26
Optical sorters. Colour and shape sorting at intake. The only mechanical route we know of to remove stray barley, wheat or rye kernels from a gluten-free lot — the physical counterpart to the visual examination method Allred published. The visual-examination method · Verified 2026-08-26
Dedicated intake and storage. Segregated bins, legs and conveyors. Shared handling equipment is a cross-contact path that no finished-beer test will reliably reveal, given the measurement problems on the testing page. Grain and malt storage · Verified 2026-08-26
— Milling —
Roller mills — two, four and six roll. The barley standard. They work on gluten-free grains but are calibrated around preserving a husk that is not there, so the gap settings that protect a filter bed on barley protect nothing here. Crush profile · Verified 2026-08-26
Corona-type and disc mills. Reported better suited to these grains, producing a flour-like grist. In barley brewing that is over-crushing; without a husk to preserve it is simply a finer crush. Crush profile · Verified 2026-08-26
Hammer mills. The fine-grist route, and the one mash filters are designed around. A hammer mill produces exactly the particle size that makes lautering impossible and mash filtration efficient — the choice of mill and the choice of wort separation are one decision, not two. Mash filters · Verified 2026-08-26
Wet milling. Conditioning grain before crushing to keep husk intact. Included because it is the clearest example of equipment whose entire purpose does not apply to a huskless grain. Crush profile · Verified 2026-08-26
— Cereal cooking and mashing —
Cereal cookers and mash kettles. Direct-fire or steam-jacketed vessels for taking a portion of grist above gelatinization temperature. These exist in gluten-free brewhouses because sorghum gelatinizes around 180°F — and the low-temperature enzyme work above suggests they may be avoidable. Gelatinization · Verified 2026-08-26
Steam-jacketed vessels and heat exchangers. The energy cost of the high-temperature route. A 95°C mash schedule against a 78°C one is a capital and utility difference, not just a process one. The low-temperature study · Verified 2026-08-26
Mash mixers and rakes. Higher-viscosity mashes from high-gelatinization starches place a different load on agitation than a barley mash does. Sorghum mash challenges · Verified 2026-08-26
Decoction kettles. Used in this site's Mash Protocol 2, and in Penn State's ExGM procedure — decoction as the mechanism for reaching gelatinization in part of the grist rather than all of it. Protocol 2 · Verified 2026-08-26
— Wort separation: the husk problem, in equipment —
Lauter tuns. The default, and the one that fails hardest here. A lauter tun depends on the grain bed as the filter medium, and these grains supply none. Wort separation · Verified 2026-08-26
Custom false bottoms — wedge wire and slotted. Gluten-free grains are markedly smaller than barley, so standard slot widths pass grain during recirculation. The filtration surface has to be specified to the grain rather than inherited with the vessel. Wort separation · Verified 2026-08-26
Mash filters. The structural answer to husklessness. A modern mash filter is a series of polypropylene membranes that can handle grist of up to 100% adjunct precisely because barley husks are not required as a filter medium — and it is built for the very fine grist a hammer mill produces. Meura, founded 1845, is the specialist; by its own account around a quarter of the world's beer passes through its equipment. Mash filter · industry overview · Verified 2026-08-26
Rice hulls as a purchased filter bed. Around half a pound per five-gallon batch is the commonly cited homebrew rate — a consumable replacing an absent husk, with cost, storage and disposal attached. Rice hull strategy · Verified 2026-08-26
Plate-and-frame and filter presses. The alternative separation route where a grain bed cannot be built. Stuck mash and filtration · Verified 2026-08-26
Decanter and disc-stack centrifuges. Separation by density rather than by filtration — Flottweg reports decanter centrifuges recovering over 98% of liquid wort from hot trub. On a grain that will not form a bed, centrifugal separation sidesteps the problem rather than solving it. Beer separation · Verified 2026-08-26
— Kettle, whirlpool and trub —
Kettles and whirlpools. Standard, with one gluten-free note: the 5-IBU hop extract substitution this site uses for foam is a kettle-side decision. The rule · Verified 2026-08-26
Hydrodynamic cavitation systems. An emerging route to wort production using controlled cavitation rather than conventional boiling, tested at real scale. Included because its claimed advantage — extraction from unconventional grist — is exactly this page's problem. The paper · Verified 2026-08-26
— Fermentation and cellar —
Unitanks and temperature control. The FAN-poor, glucose-forward worts mapped on yeast and fermentation change fermentation profile and therefore cooling demand. Verified 2026-08-26
Yeast propagation equipment. Relevant here because underpitching a low-FAN wort compounds the nitrogen problem rather than merely slowing the ferment. Yeast management · Verified 2026-08-26
— Filtration and stabilisation —
Diatomaceous earth filters, sheet and pad filters. The traditional clarification route. Stuck mash and filtration · Verified 2026-08-26
Crossflow membrane filtration. The DE-free alternative, and one route to clarity on worts that will not settle conventionally. DE-free conditioning · Verified 2026-08-26
PVPP and silica gel stabilisation. Polyphenol and protein removal. Sorghum's polyphenols matter twice over — they are astringent and they inhibit amylases — so stabilisation choices reach both flavor and conversion. Verified 2026-08-26
DE-free and PVPP-free conditioning. Published work on rough-beer conditioning without either — relevant to small producers who cannot justify a DE plant. The study · Verified 2026-08-26
— Cleaning and segregation —
CIP systems. Routine everywhere; load-bearing here. In a shared facility the CIP regime between a barley run and a gluten-free run is the actual control, and the testing page documents why the finished-beer test will not reliably catch a failure. Cross-contact prevention · Verified 2026-08-26
Dedicated equipment and facilities. The alternative to validated cleaning: separate lines, separate vessels, or a separate building. Dedicated equipment · Verified 2026-08-26
Air handling and dust control. Milling generates airborne grain dust. In a facility handling both barley and gluten-free grain, the mill room is a cross-contact vector that no wort or beer sample represents. Cross-contact prevention · Verified 2026-08-26
— Measurement in the brewhouse —
Refractometers, hydrometers and density meters. Extract measurement — and on a glucose-forward wort, apparent attenuation behaves differently than the barley-derived tables assume. The sugar bible · Verified 2026-08-26
pH meters and water treatment. Mash pH governs enzyme performance, and the enzymes here are often dosed rather than native. Water, minerals and pH · Verified 2026-08-26
Viscosity and β-glucan measurement. The properties that predict a stuck mash before it happens. Stuck mash and filtration · Verified 2026-08-26
Foam analysers (NIBEM and equivalents) and haze meters. The instruments behind the texture half of the flavor and texture page. Verified 2026-08-26
— Malt and grain supply —
Grouse Malt House. The gluten-free malthouse named more often than any other supplier across this site's pages, appearing on the millet, rice and quinoa directories. Our millet directory · Verified 2026-08-26
Eckert Malting & Brewing. Named on this site's rice work — a California malthouse in the gluten-free supply chain. Our rice directory · Verified 2026-08-26
Crisp Malt / Micronized Food Products (MFP). Flaked torrefied rice — pre-gelatinized for direct mash use, which moves the gelatinization step out of the brewhouse and into a supplier's process. In the US market since around 2018, typically 10–20% of grist. Product · brewer's guide · Verified 2026-08-26
Gusmer Enterprises. The century-old US brewing supplier carrying filtration media and processing aids; appears in the distribution layer of this directory's external-enzymes page. External enzymes · Verified 2026-08-26
Low-temperature enzyme blends. The commercial category implied by the Nottingham work: enzyme systems converting unmalted sorghum below gelatinization temperature. It changes what a gluten-free brewhouse needs — no cereal cooker, lower steam demand — moving cost from capital to consumables. The study · external enzymes · Verified 2026-08-26
Megazyme. Assay kits for cereal and brewing measurement — the instruments a maltster uses to specify what enters the mash. Internal enzymes · Verified 2026-08-26
6. Organizations & Events — trade bodies, engineering groups, and the field's calendar
— US technical bodies —
American Society of Brewing Chemists (ASBC). Founded 1934. Its official methods are the analytical language malt and wort are specified in, and the Journal of the ASBC carries the diastatic-power comparison this page's conversion problem starts from. ASBC · Verified 2026-08-26
Master Brewers Association of the Americas (MBAA). The other US technical body; its district meetings and technical quarterly are where process practice is argued rather than published. MBAA · Verified 2026-08-26
Craft Maltsters Guild. The US route by which malting research reaches the people who could run it — and the audience for any process change that starts at the malthouse. The Guild · Verified 2026-08-26
— International —
Institute of Brewing and Distilling (IBD). Publishes the Journal of the Institute of Brewing, which carries the majority of this page's literature — Bajomo and Young, Owuama, Taylor, Agu and Palmer, Schnitzenbaumer and Arendt. IBD · Verified 2026-08-26
European Brewery Convention (EBC). Founded 1946; since 2007 the scientific and technical arm of The Brewers of Europe. Analytica-EBC runs to over 240 analytical methods spanning raw materials, malt, wort, beer and packaging. For this page that matters because a non-barley process can only be argued about in numbers another brewer can reproduce, and Analytica-EBC is one of the two books those numbers come from. EBC · Verified 2026-08-26
The Brewers of Europe. The Brussels trade body the EBC merged into, representing national brewing associations across Europe — and the institutional route by which brewhouse technical work reaches European regulation. The Brewers of Europe · Verified 2026-08-26
— Events —
ASBC Annual Meeting. Where US brewing-science work on these grains first appears, often years before journal publication. ASBC · Verified 2026-08-26
Craft Malt Conference. Hosted at Montana State in 2019 with roughly 170 maltsters, growers and brewers — the gathering where malt-side process change would be transmitted. The conference · Verified 2026-08-26
7. Literature & Datasets — the anchor works, the methods, and the published data
— Gelatinization and starch —
The physical constraint this page opens on: these starches gelatinize above barley's range, which is why cereal cooking exists here at all.
Sang, Bean, Seib, Pedersen & Shi (2008), Structure and functional properties of sorghum starches differing in amylose content. Journal of Agricultural and Food Chemistry 56:6680–6685. Amylose content as the variable behind sorghum starch behavior. PubMed 18627168 · doi:10.1021/jf800577x · Verified 2026-08-26
Yang et al. (2024), Structural and physicochemical characteristics of starches from sorghum varieties with varying amylose content. Food Science & Nutrition. The current treatment of the same question, variety by variety — cultivar-level starch data of the kind mash design needs and rarely has. Gelatinization · Verified 2026-08-26
Sorghum gelatinization temperature. Commonly cited in brewing sources at about 180°F (82°C). The starch literature is less tidy and more useful: roughly 66–81°C, varying by cultivar, with published ranges of 68–72, 68–76 and 68–78°C, and amylose content correlating positively with the temperature required. The 82°C figure sits at the top of that range rather than in the middle of it — so a schedule built on it is conservative by design, and a lot-specific figure could be lower. Gelatinization · Verified 2026-08-26
The protein stand as a gluten lever. A stand at 45°C for 20 minutes before raising to 64–65°C is reported to lower protein levels — including gluten. A mash-schedule decision with a testing and certification consequence. Verified 2026-08-26
— The finding that removes this page's central constraint —
Mashing with unmalted sorghum using a novel low-temperature enzyme system: impacts of sorghum grain composition and microstructure (2017). Food Chemistry. This page opens on gelatinization: these starches need temperatures barley does not, which is why cereal cooking and high-temperature rests exist here at all. This work removes that premise. A novel enzyme blend and mash schedule peaking at 78°C produced worts of quality comparable to a traditional schedule peaking at 95°C — avoiding high-temperature starch gelatinization altogether, at markedly lower energy cost.
Two consequences follow, and the second is larger than the first. The low-temperature mash was less dependent on sorghum raw material quality, so it may permit varieties previously written off as non-brewing. And the study found that brewing performance was governed not by protein content but by how protein was structured — specifically the strength of protein–starch interactions. The specification the field measures may not be the property that decides the outcome. PubMed 27979210 · Nottingham repository · Verified 2026-08-26
A Novel Low-temperature Mashing Schedule for Brewing with Unmalted Sorghum. BrewingScience. The schedule itself, published separately from the compositional study. The paper · Verified 2026-08-26
Effects of high pressure and temperature on the structure and rheological properties of sorghum starch. The other route around gelatinization: pressure rather than heat. Gelatinization · Verified 2026-08-26
Okolo (1997), Amylolysis of sorghum starch as influenced by cultivar, germination time and gelatinisation temperature. Journal of the Institute of Brewing. Cultivar-level gelatinization and amylolysis, in a brewing journal, in 1997 — the study that disproves this page's own earlier gap claim. The paper · Verified 2026-08-26
Integrated Starches and Physicochemical Characterization of Sorghum Cultivars. Cultivar-by-cultivar starch characterisation, including thermal behavior. PMC9229435 · Verified 2026-08-26
— Conversion in the mash —
Bajomo & Young (1993), The properties, composition and fermentabilities of worts made from 100% raw sorghum and commercial enzymes. Journal of the Institute of Brewing. The foundational demonstration that raw sorghum plus dosed enzymes makes a fermentable wort — the process this site's own protocols descend from. Mash methods compared · Verified 2026-08-26
Bajomo & Young (1994), Fermentation of worts made from 100% raw sorghum and enzymes. Journal of the Institute of Brewing 100(2). The follow-on: what that wort does in the fermenter. Enzyme conversion in the mash · Verified 2026-08-26
Okolo et al. (2020), Influence of malted barley and exogenous enzymes on the glucose/maltose balance of worts with sorghum or barley as an adjunct. The sugar-profile question stated directly — which is a mash design question before it is a fermentation one. The sugar bible · Verified 2026-08-26
Agu & Palmer (1997), α-Glucosidase Activity of Sorghum and Barley Malts. Journal of the Institute of Brewing 103. Early identification of the enzyme later shown to drive sorghum fermentability. doi:10.1002/j.2050-0416.1997.tb00933.x · Verified 2026-08-26
Taylor (1993), Factors Influencing Beta-Amylase Activity in Sorghum Malt. Journal of the Institute of Brewing 99(1). Why sorghum malt is β-amylase poor, and what moves it. Internal enzymes · Verified 2026-08-26
Etokakpan & Palmer (1990), Comparative studies of the development of endosperm-degrading enzymes in malting sorghum and barley. World Journal of Microbiology and Biotechnology. The endosperm-modification difference that shapes everything downstream of the mill. Internal enzymes · Verified 2026-08-26
Muoria, Linden & Bechtel (1998), Diastatic Power and α-Amylase Activity in Millet, Sorghum, and Barley Grains and Malts. JASBC 56(4). The comparative baseline: sorghum's α-amylase at a fraction of barley's. doi:10.1094/ASBCJ-56-0131 · Verified 2026-08-26
— Nitrogen through the process —
Taylor & Boyd (1986), Free α-amino nitrogen production in sorghum beer mashing. Journal of the Science of Food and Agriculture. FAN treated as a mashing output rather than a fermentation input — the earlier and more useful framing. Yeast nutrition · Verified 2026-08-26
Hill & Stewart (2019), Free Amino Nitrogen in Brewing. Fermentation 5(1):22. The reference treatment. doi:10.3390/fermentation5010022 · Verified 2026-08-26
Espinosa-Ramírez et al. (2013), Fate of free amino nitrogen during liquefaction and yeast fermentation of maize and sorghums differing in endosperm texture. Food and Bioproducts Processing. Endosperm texture — a milling property — changing nitrogen behaviour downstream. doi:10.1016/j.fbp.2012.08.007 · Verified 2026-08-26
— Brewing these grains, reviewed —
Taylor et al. (2013), 125th Anniversary Review: The science of the tropical cereals sorghum, maize and rice in relation to lager beer brewing. Journal of the Institute of Brewing. The standing review of the whole subject. Our sorghum directory · Verified 2026-08-26
Owuama (1999), Brewing Beer with Sorghum. Journal of the Institute of Brewing 105:23–34. doi:10.1002/j.2050-0416.1999.tb00002.x · Verified 2026-08-26
Owuama (1997), Sorghum: a cereal with lager beer brewing potential. World Journal of Microbiology and Biotechnology 13:253–260. doi:10.1023/A:1018566503879 · Verified 2026-08-26
Schnitzenbaumer & Arendt (2014), Brewing with up to 40% unmalted oats and sorghum: a review. Journal of the Institute of Brewing. The unmalted-adjunct ceiling, reviewed. Internal enzymes · Verified 2026-08-26
Agu & Palmer (2013), Evaluation of the potentials of millet, sorghum and barley with similar nitrogen contents malted at their optimum germination temperatures. Malting three grains on equal terms — the comparison most malting literature avoids. Our millet directory · Verified 2026-08-26
— This site's own process evidence —
These are findings from commercial production rather than published studies, and are recorded as such.
Why the 190°F / 60-minute baseline exists. A hold that proved reliable across real production conditions, with the commercial evidence behind it and an explicit statement of what it does and does not establish. The page · Verified 2026-08-26
The mash that wouldn't convert. The documented failure of native- enzyme conversion on sorghum malt — not because the enzymes died, but because the malt carries the wrong ones. This is why this site designs conversion with external enzymes. The case · Verified 2026-08-26
Rice hull strategy. Husklessness as a process decision rather than an afterthought. The page · Verified 2026-08-26
Mash methods compared, and protocols 1–3. Enzyme mash, decoction cereal mash, and the proposed maltose mash, set against each other. Methods compared · Verified 2026-08-26
Stuck mash, lautering and filtration survival. The practical treatment of the constraint this page names first. The page · Verified 2026-08-26
Malt lab mash process for testing. The site's own laboratory mash procedure — the bridge between malt specification and brewhouse behavior. The page · 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.
Pre-gelatinized adjunct removes the cereal cook from the equation. Flaked torrefied rice is cooked and gelatinized before it reaches the brewery, so a brewer using it at 10–20% of grist has moved the gelatinization step out of the kettle and into a supplier's process. That is the cleanest example of this page's pattern: the answer to a physical constraint arrives as a product, not as a paper. The product · gelatinization
A mash-schedule choice is also a gluten choice. A protein stand at 45°C before the saccharification rest is reported to lower protein levels, gluten among them. That puts a lever on the testing and certification page's problem inside the mash schedule — process affecting a compliance number, not just a flavour or yield one. Testing and certification
Flour is a fault in barley brewing and a target here. Grinders producing malt flour are reported better suited to these grains than roller mills. Barley practice treats flour as over-crushing because the husk is the filter; with no husk to protect, the calculation inverts. Crush profile · rice hull strategy
The filter bed is now a line item. Roughly half a pound of rice hulls per five-gallon batch is the commonly cited rate. In barley brewing the filter medium arrives free, attached to the grain; here it is purchased, transported and disposed of — a cost structure difference that no recipe reflects. Rice hull strategy
Cultivar decides mash temperature, and nobody publishes the table. Amylose content varies by sorghum variety and drives gelatinization behaviour, so the temperature a mash must reach is a property of the lot. That is precisely the argument the lot reporting standard makes about everything else. The starch work
Extrusion changes flavour, which makes it two pages' business. Ma et al. found extruded sorghum beer carried a greater ester load than unextruded. Extrusion is a process decision on this page with a measured consequence on flavor and texture — one of the few documented process-to-flavour links on these grains. The study
One institution measures what enters the mash for everyone else. Montana State's malt quality lab runs extract, β-glucan, FAN, diastatic power, α-amylase, filtration time and turbidity as third-party analysis for craft maltsters. Every process decision on this page depends on numbers like those, and most gluten-free brewers have no lab. The lab
Two protocols disagree on this site, deliberately. Mash Protocol 1 is the enzyme mash this site runs; Protocol 3 is a proposed maltose mash published as unproven with the evidence it would need. Keeping an untested proposal in view beside a working practice is unusual, and it is how this page's subject actually advances. Methods compared · Protocol 3
The husk problem was solved by equipment, for someone else, decades ago. A modern mash filter handles grist of up to 100% adjunct precisely because barley husks are not required as a filter medium. The constraint this page opens on — no husk, therefore no filter bed — is a lauter tun constraint, not a brewing constraint. Meura has been building around it since 1845 and reckons a quarter of the world's beer passes through its equipment. Gluten-free brewing inherited the problem by inheriting the vessel. Mash filter · industry overview
Mill choice and separation choice are one decision. A hammer mill produces the fine grist that makes lautering impossible and mash filtration efficient. Reports that grinders suit these grains better than roller mills, and the mash filter's requirement for fine grist, are the same finding approached from opposite ends — but a brewer who buys the mill without the filter has made the problem worse. Crush profile · mash filters
Three of this page's constraints have equipment answers that gluten-free brewing has not adopted. Husklessness → mash filter. Gelatinization → pre-gelatinized adjunct or low-temperature enzymes. Wort that will not settle → decanter centrifuge, recovering over 98% of liquid from hot trub. Each is established technology in industrial brewing; none is standard in this category. Mash filter · centrifugation · low-temperature enzymes
The real control on cross-contact is CIP, and no beer test will audit it. In a shared facility, what separates a barley run from a gluten-free one is the cleaning regime and the segregation of mill, conveyors and storage. The testing page documents that finished-beer assays under-read hydrolysed gluten — so a cleaning failure is precisely the failure mode the final check is worst at catching. Cross-contact prevention · dedicated equipment
Dust is a cross-contact vector with no sample point. Milling generates airborne grain dust, and a shared mill room distributes it. Nothing in a wort or beer sample represents the air a gluten-free grist passed through — which puts an air-handling decision upstream of a compliance claim. Testing and certification
Optical sorting is the mechanical form of a published method. Allred published visual examination for finding gluten-containing kernels in a gluten-free lot. An optical sorter does the same job continuously at intake. The method exists in the literature and the machine exists in the trade, and we have found nobody connecting them for this category. The method
A federal unit already measures the property that decides brewing performance. Nottingham found protein structure — protein–starch interaction strength — governs performance more than protein content. USDA-ARS runs a Grain Quality and Structure Research Unit. The measurement capability and the finding exist in different countries and have not met. The study
The constraint this page is built on may be optional. Gelatinization is the reason cereal cooking exists in gluten-free brewing — and a novel enzyme system mashing to only 78°C produced wort comparable to a 95°C schedule. If that holds at scale, the equipment problem this page maps is not a property of the grain but of the enzymes available when the practice was established. The study · gelatinization
It could widen the varietal base, which matters more than the energy saving. The low-temperature mash was less dependent on raw material quality, so varieties previously considered non-brewing may become usable. Every grain page in this directory maps a supply chain constrained by which cultivars perform; this loosens that constraint from the process end rather than the breeding end. The study · sorghum
Protein structure beat protein content. Brewing performance tracked the strength of protein–starch interactions rather than how much protein the grain carried. Malt specifications report content. If structure is what decides the outcome, the industry is trading on a number that correlates rather than causes — the same critique this site's evaluation methods work makes of diastatic power. The study · lot reporting standard
Three routes around gelatinization now exist, and they are on three different pages. Pre-gelatinized adjunct moves it to the supplier; low-temperature enzyme systems avoid reaching it; koji converts without a conventional mash at all. The constraint has more answers than the practice reflects. Pre-gelatinized rice · low-temperature enzymes · koji
This page's knowledge lives in supplier notes, and that is a finding rather than a complaint. The academic literature on gluten-free process is thin; the practitioner and equipment literature is not. That inverts the usual relationship in this directory, where research leads and commerce follows — and it means a brewer's best source here is often a technical sheet, not a paper. Our framing · external enzymes
Three constraints, one root: there is no husk. Lautering has no natural filter bed, so rice hulls become a purchased input rather than a by-product of the grist. Every downstream decision on this page — crush, wort separation, stuck-mash recovery — follows from the same absence. Rice hull strategy · stuck mash and filtration
Gelatinization is why cereal cooking exists here at all. These starches gelatinize above barley's range, and amylose content varies by cultivar — so the temperature a mash must reach is a property of the lot, not of the grain in general. That is the same lot-variability argument the testing and certification wing makes about gluten. Gelatinization · the sugar bible
A documented failure, not a theory, produced this site's doctrine. The first sorghum beers here were built to convert on the malt's native enzymes and did not — because sorghum malt carries the wrong ones, not because the enzymes were dead. That single production failure is why this site designs conversion with external enzymes. The case · internal enzymes
A mash change can remove the enzyme purchase. Penn State's ExGM decoction procedure reaches high fermentable-sugar concentrations from gluten-free malts without enzyme supplementation. Set against the external enzymes page, which maps an industry built on dosing, that is a process answer to a purchasing problem. The research
Milling is upstream of nitrogen. Espinosa-Ramírez traced free amino nitrogen through liquefaction in sorghums differing in endosperm texture — a milling property changing what the yeast is eventually handed. The crush decision on this page reaches the fermenter mapped on yeast and fermentation. The study · crush profile
The grains are too small for ordinary mill settings. Teff and fonio are smaller than a poppy seed. Equipment calibrated for barley does not transfer, which is a supplier problem before it is a research one — and it is why the mills named on this page matter more than the papers do. Teff · fonio
A named baseline exists because production, not a paper, established it. The 190°F, 60-minute hold on this site is defended on commercial evidence and is explicit about what it does and does not prove. That is the shape most knowledge on this page takes. The baseline
Research gaps — where the field's coverage runs out
The low-temperature mash has not been tested at commercial scale in gluten-free brewing. The Nottingham result is a laboratory and pilot-scale finding on unmalted sorghum. We have found no gluten-free brewery reporting it in production, and no supplier marketing an enzyme blend on that basis to this category.
Nobody has published a protein-structure specification. If protein–starch interaction strength governs brewing performance, a maltster would need a way to measure it. We have found no assay proposed for routine use.
No gluten-free brewery we have found runs a mash filter. The technology directly answers this page's central constraint and is mature at industrial scale. We have found no gluten-free producer using one, and no supplier marketing mash filtration to this category on that basis.
Cross-contact controls are undocumented as a system. Segregated intake, dedicated milling, air handling and CIP validation are each discussed piecemeal. We have found no published cross-contact control plan for a shared-facility gluten-free brewery, and no study measuring which control actually carries the risk.
Optical sorting has no published validation for gluten removal. The machines exist and the visual-examination method is published, but we have found no work establishing what removal rate an optical sorter achieves on gluten-containing kernels in a gluten-free lot.
The academic literature is thin and this page says so. Most of what is known about gluten-free brewhouse practice is unpublished — held in supplier technical notes, brewery experience and pages like this site's. That is the field's actual condition, not a gap in our searching.
This section claimed no cultivar-level gelatinization data exists for brewing. It does, and it is thirty years old. Okolo's 1997 study in the Journal of the Institute of Brewing is titled Amylolysis of sorghum starch as influenced by cultivar, germination time and gelatinisation temperature. The wider literature puts sorghum starch gelatinization at roughly 66–81°C and explicitly variable between cultivars, with amylose content (20.9–30.2%) positively correlated to gelatinization temperature, and onset temperatures across cultivars spanning a very wide range. The gap that survives is narrower and more practical: no brewer-facing table maps commercially available gluten-free malt lots to a gelatinization figure, so the data exists in the literature and not on a certificate of analysis.
Mill settings for the small grains are undocumented. Teff and fonio are smaller than a poppy seed and ordinary settings do not apply. We have found no published crush specification for either.
Equipment claims are untested independently. Filtration media, mash filters and hull alternatives are sold into this market on supplier data. We have found no independent comparison run on gluten-free wort.
Mash Protocol 3 remains a proposal. This site's own maltose mash is published as unproven, with the evidence it would need stated. Nobody — including us — has run it.
Build equipment, or solve these problems for a living? 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.