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Sources & References

This is the trust page. It says who stands behind the site, what evidence each section rests on, and how to judge a claim — primary experience and records first, outside standards and data to verify, and clear labels on anything that is illustrative rather than current.

A technical reference is only as good as its sources. This page pulls them into one place so a claim anywhere on the site can be traced back to where it came from.

Who Stands Behind This​

The site is written by Craig Belser — founder, brewer, developer, and a celiac who has been brewing gluten-free since 2003. He helped found Bard's, developed the malted-sorghum beer behind it, and spent more than twenty years learning what gluten-free grain, malt, enzymes, process, and quality control actually demand in commercial production. Full background: About Craig and Bard's Story.

That means the technical guidance here is grounded in real production experience and records, not a clean theory exercise. It also means opinions are labeled as opinions, and the one non-negotiable is stated plainly: no wheat, barley, rye, or oats — ever.

The site uses AI to organize material and tighten writing. AI is not the source of the knowledge and does not overrule evidence, experience, or reality — see where AI fits.

How to Judge a Claim Here​

  • Primary experience and records first. The brewing pages rest on real commercial production and quality records.
  • Outside standards and data to verify. Regulations, enzyme-maker documentation, and published research are cited where they carry the weight, not decoration.
  • Illustrative data is labeled. The market figures come from a 2019 study; every number is stamped illustrative, deliberately conservative, and not current — validate before making a live claim.
  • Measured vs. estimated. Where a figure is an in-house estimate rather than measured data, the site says so. When measured data and an estimate disagree, the measured data wins.

The Research Library — the Primary Record, Published​

The strongest sources behind this site are no longer summarized — they're published. The Research Library holds the primary record in full: original datasets with downloadable CSVs and ready-to-paste citations, a survey of every evaluation methodology the field has used, and the standards we propose for the field to adopt or tear apart.

ShelfWhat's on itStart here
Data CatalogEvery published dataset, one row each, with downloads and citationsThe catalog
Cultivar dataThe USDA-ARS Madison screening (25 named cultivars) and the 2002–2004 screenings (74 more samples)USDA Madison Screening
Evaluation methodsEach methodology the field has used, reviewed on its own page, plus the side-by-side comparisonMethods Overview
Production dataIndependent laboratory analyses of production malt and finished beer — Hartwick, Midwest, and LCBO certificates in fullHartwick 2019
Proposed standardsSpecific, versioned, criticizable proposals — starting with sorghum malt evaluationGFB-SME draft
Research asksThe open questions, specified well enough to run — any scale welcomeResearch Asks

This library grows as archive records clear review. Each addition follows the same rules: programmatic transcription, full-precision downloads, honest provenance, and a citation block.

Primary Sources Behind the Knowledge Base​

SectionWhat it rests onStart here
Brewing process & protocolsCommercial production records and protocol runs — real mashes, doses, temperatures, and outcomesThe Reliable Mash, Why the 190°F Baseline Exists, External Enzymes
Malting & grainThe production malting program's own quality standards, the USDA-ARS collaboration, and independent laboratory analyses of production maltCultivars for Malting, Why Native Malt Enzymes Are Not Enough
Quality, safety & trustIndependent laboratory analyses, official FGIS inspection results, and grain-acceptance records, organized into a farm-to-package trust chainQA Trust Chain, Grain Source & Acceptance
Market & business caseAn independent 2019 target-audience research study built on MRI (Mediamark) syndicated consumer data, plus Bard's own consumer surveyWhat the 2019 Audience Research Found, Gluten Survey Results

Standards, Regulations & Literature​

How this list works: every claim that leans on an outside source is footnoted on the page that makes it — those per-page citations are the canonical record. This section is the organized survey of that record, regenerated from the site's own footnotes (last regenerated 2026-08-10; if a page's footnote and this list ever disagree, the page wins and this list needs its refresh).

Regulation and official standards​

Sorghum malting and brewing science​

  • Taylor, J.R.N. et al. (2013). 125th Anniversary Review: The science of the tropical cereals sorghum, maize and rice in relation to lager beer brewing. J. Inst. Brewing 119. doi:10.1002/jib.68
  • Taylor, J.R.N. (1993). Factors Influencing Beta-Amylase Activity in Sorghum Malt. J. Inst. Brewing 99(1). doi:10.1002/j.2050-0416.1993.tb01181.x
  • Taylor, J.R.N. & Boyd, H.K. (1986). Free α-amino nitrogen production in sorghum beer mashing. J. Sci. Food Agric. doi:10.1002/jsfa.2740371109
  • Owuama, C.I. (1997). Sorghum: a cereal with lager beer brewing potential. World J. Microbiol. Biotechnol. 13:253–260. doi:10.1023/A:1018566503879
  • Owuama, C.I. (1999). Brewing Beer with Sorghum. J. Inst. Brewing 105:23–34. doi:10.1002/j.2050-0416.1999.tb00002.x
  • Bajomo, M.F. & Young, T.W. (1993). The properties, composition and fermentabilities of worts made from 100% raw sorghum and commercial enzymes. J. Inst. Brewing 99(2). doi:10.1002/j.2050-0416.1993.tb01158.x
  • Bajomo, M.F. & Young, T.W. (1994). Fermentation of worts made from 100% raw sorghum and enzymes. J. Inst. Brewing 100(2). doi:10.1002/j.2050-0416.1994.tb00810.x
  • Agu, R.C. & Palmer, G.H. (1997). α-Glucosidase Activity of Sorghum and Barley Malts. J. Inst. Brewing 103. doi:10.1002/j.2050-0416.1997.tb00933.x
  • Agu, R.C. & Palmer, G.H. (2013). Evaluation of the potentials of millet, sorghum and barley with similar nitrogen contents malted at their optimum germination temperatures for use in brewing. J. Inst. Brewing 119. doi:10.1002/jib.91
  • Etokakpan, O.U. & Palmer, G.H. (1990). Comparative studies of the development of endosperm-degrading enzymes in malting sorghum and barley. World J. Microbiol. Biotechnol. 6(4):408–417. doi:10.1007/BF01202124
  • Muoria, J.K., Linden, J.C. & Bechtel, P.J. (1998). Diastatic Power and α-Amylase Activity in Millet, Sorghum, and Barley Grains and Malts. J. Am. Soc. Brewing Chemists 56(4):131–135. doi:10.1094/ASBCJ-56-0131
  • Adefila et al. (2012). Characterization of an α-amylase from sorghum obtained under optimized conditions. J. Inst. Brewing. doi:10.1002/jib.11
  • Swanston, J.S., Rao, N.S., Subramanian, V. & Taylor, K. (1994). The influence of some aspects of grain quality on malting potential in sorghum. J. Cereal Science. doi:10.1006/jcrs.1994.1012
  • Iwuoha, C.I. & Aina, J.O. (1997). Effects of steeping condition and germination time on the alpha-amylase activity, phenolics content and malting loss of Nigerian local red and hybrid short Kaura sorghum malts. Food Chemistry. doi:10.1016/0308-8146(95)00215-4
  • Malting Characteristics of Sorghum Cultivars. Cereal Chemistry 72(6):533 (1995). cerealsgrains.org PDF
  • Schnitzenbaumer, B. & Arendt, E.K. (2014). Brewing with up to 40% unmalted oats (Avena sativa) and sorghum (Sorghum bicolor): a review. J. Inst. Brewing 120(4). doi:10.1002/jib.152
  • Garzón & Drago (2018). Aptitude of sorghum hybrids for brewery or bio-functional malted beverages. J. Food Biochemistry. doi:10.1111/jfbc.12692
  • Espinosa-Ramírez et al. (2013). Fate of free amino nitrogen during liquefaction and yeast fermentation of maize and sorghums differing in endosperm texture. Food Bioprod. Processing. doi:10.1016/j.fbp.2012.08.007
  • Espinosa-Ramírez et al. (2020). Use of Aspergillus oryzae during sorghum malting to enhance yield and quality of gluten-free lager beers. Bioresour. Bioprocess. doi:10.1186/s40643-020-00330-w
  • Okolo, B.N. et al. (2020). Influence of malted barley and exogenous enzymes on the glucose/maltose balance of worts with sorghum or barley as an adjunct. J. Inst. Brewing 126(1). doi:10.1002/jib.598
  • Khoddami, A., Mohammadrezaei, M. & Roberts, T.H. (2017). Effects of Sorghum Malting on Colour, Major Classes of Phenolics and Individual Anthocyanins. Molecules. doi:10.3390/molecules22101713
  • Convertibility of IoB, EBC and SABS Methods for Sorghum Diastatic Power. J. Inst. Brewing (2004). Archived PDF

Starch, wort, and fermentation chemistry​

  • Sang, Y., Bean, S., Seib, P. A., Pedersen, J., & Shi, Y.-C. (2008). Structure and Functional Properties of Sorghum Starches Differing in Amylose Content. J. Agric. Food Chem. doi:10.1021/jf800577x
  • Yang et al. (2024). Structural and physicochemical characteristics of starches from sorghum varieties with varying amylose content. Food Sci. Nutr. doi:10.1002/fsn3.4245
  • Stewart, G.G. (2016). Saccharomyces species in the Production of Beer. Beverages 2(4):34. doi:10.3390/beverages2040034
  • Alves, S.L. et al. (2008). Molecular Analysis of Maltotriose Active Transport and Fermentation by Saccharomyces cerevisiae. Appl. Environ. Microbiol. 74(5):1494–1501. doi:10.1128/AEM.02570-07
  • Hill, A. & Stewart, G.G. (2019). Free Amino Nitrogen in Brewing. Fermentation. doi:10.3390/fermentation5010022

Malting safety, microbial control, and mycotoxins​

  • Lefyedi, M.L. & Taylor, J.R.N. (2007). Control of the Growth of Coliforms and Moulds in Sorghum Malting by Bacterial and Yeast Cultures. J. Inst. Brewing. doi:10.1002/j.2050-0416.2007.tb00267.x
  • Tawaba et al. (2012). Optimizing red sorghum malt quality when Bacillus subtilis is used during steeping to control mould growth. J. Inst. Brewing. doi:10.1002/jib.36
  • Neme, K. & Mohammed, A. (2017). Mycotoxin occurrence in grains and the role of postharvest management as a mitigation strategy. Food Control. doi:10.1016/j.foodcont.2017.03.012
  • Tola et al. (2022). Fungal Species and Multi-Mycotoxin Associated with Post-Harvest Sorghum Grain in Eastern Ethiopia. Toxins. doi:10.3390/toxins14070473
  • Ciasca et al. (2022). Mycotoxin Analysis of Grain via Dust Sampling. Toxins. doi:10.3390/toxins14060381

Gluten detection and celiac safety​

  • Panda, R. et al. (2015). Detection and Quantification of Gluten during the Brewing and Fermentation of Beer Using Antibody-Based Technologies. J. Food Protection. doi:10.4315/0362-028X.JFP-14-546
  • Panda, R. & Garber, E.A.E. (2019). Detection and Quantitation of Gluten in Fermented-Hydrolyzed Foods by Antibody-Based Methods. Frontiers in Nutrition. doi:10.3389/fnut.2019.00097
  • Real, A. et al. (2014). Identification and in vitro reactivity of celiac immunoactive peptides in an apparent gluten-free beer. PLOS ONE. doi:10.1371/journal.pone.0100917
  • Allred, L.K. et al. (2017). The Celiac Patient Antibody Response to Conventional and Gluten-Removed Beer. J. AOAC International. doi:10.5740/jaoacint.16-0184
  • Allred, L.K., Kupper, C. & Quinn, A. (2018). The Use of Visual Examination for Determining the Presence of Gluten-Containing Grains in Gluten Free Oats and Other Grains, Seeds, Beans, Pulses, and Legumes. J. AOAC International. doi:10.5740/jaoacint.170414
  • Celiac prevalence and gluten-avoidance context: American Journal of Gastroenterology (prevalence); Catassi et al., Nutrients (2013); Cascella et al., Schizophrenia Bulletin (2011); Mayo Clinic Proceedings (2016).

Foam and hop chemistry​

  • Ferreira, I.M. et al. (2005). Effects of the combination of hydrophobic polypeptides, iso-alpha acids, and malto-oligosaccharides on beer foam stability. J. Agric. Food Chem. doi:10.1021/jf047796w
  • Kunimune, T. & Shellhammer, T.H. (2008). Foam-Stabilizing Effects and Cling Formation Patterns of Iso-α-acids and Reduced Iso-α-acids in Lager Beer. J. Agric. Food Chem. doi:10.1021/jf8011079
  • Takoi, K. (2021). Influence of hop bitter acids and their derivatives on beer foam stability evaluated using customer-oriented Foam Collapse Time. BrewingScience. doi:10.23763/BrSc21-14takoi

Industry and supplier documentation​

  • Enzyme manufacturer technical data sheets and brewing guidance for the exogenous enzyme systems the protocols use (Termamyl, Ondea Pro, and glucoamylase families) — cited by class on the process pages; product names churn, declared activities are the durable reference.
  • Brewers Association craft-brewing statistics (2017).

Key Terms​

A starting glossary — the terms most likely to be read loosely elsewhere. This is a stub; it will grow.

TermWorking definition
Truly gluten-freeBrewed from gluten-free grains from the start — never barley, wheat, rye, or oats. The house standard here.
Gluten-reducedBrewed with gluten grains, then treated to lower detectable gluten. A different promise; not the same market.
External (exogenous) enzymesEnzymes added to the mash to do the conversion sorghum malt's own enzymes cannot reliably carry. "Malt for character, external enzymes for conversion."
LiquefactionThe hot step that opens starch and thins the mash so downstream conversion has a fair chance.
Diastatic powerA malt's native enzyme capacity. Here it characterizes a malt lot; it is not a release gate, because conversion is external.
Pre-fermentation evidenceThe supplier, intake, malt, and process records gathered before fermentation — what a truly gluten-free claim actually rests on, since fermentation makes gluten hard to detect.
MRI indexIn the market data, 100 = the national average for a behavior; above 100 means it concentrates in that group or region.

An Open Reference​

Gluten Free Brewer is meant to be a working, open resource for brewers, maltsters, suppliers, researchers, and serious gluten-free beer people. If something here is wrong, unclear, or out of date, that is worth fixing — get in touch.