Sourjoe Citations & References

How to use this page

• Specific beats general. Prefer a named article, book record, paper, or guide page over a site homepage.
• Recipes and calculators are guidance, not lab reports. Formula outputs should be treated as practical estimates unless a section explicitly says otherwise.
• Weights beat volumes. Flour, water, salt, starter, and add-ins should be weighed whenever possible; volume conversions are best treated as kitchen approximations.
• Food-safety and allergen claims need regulatory or medical-facing sources. Do not rely on a recipe blog for gluten-free, allergen, or nutrition-label claims.
• Other bakers' sites, books, and apps are cited as sources, not endorsements. Where a citation happens to point to a product or app that also serves home bakers, the note describes only what that source documents or originated — it is not a recommendation, comparison, or claim of authority over Sourjoe's own methods.

Ingredients, weights, and kitchen measures

• Unit conversion King Arthur Baking. Ingredient Weight Chart. kingarthurbaking.com/learn/ingredient-weight-chart
  Why cited: common baking weights, especially flour-weight guidance for calculator reference tables.
• Measurement King Arthur Baking. How to measure flour. kingarthurbaking.com/blog/2023/10/13/how-to-measure-flour
  Why cited: caution that volume-measured flour varies materially depending on handling.
• Metric / imperial National Institute of Standards and Technology. Metric Kitchen. nist.gov/pml/owm/metric-si/metric-kitchen
  Why cited: household cooking equivalencies and metric-conversion framing.
• Food science McGee, H. (2004). On Food and Cooking: The Science and Lore of the Kitchen. ISBN: 9780684800011. Book record
  Why cited: broad food-science background for ingredient behaviour, starch, gluten, heat, and fermentation context.
• Bread science Calvel, R. (2001 English translation). The Taste of Bread. ISBN: 9780834216464. Book record
  Why cited: classic professional bread reference for mixing, fermentation, dough maturity, and flavour.
• Reference set Myhrvold, N., Migoya, F., et al. Modernist Bread. ISBN: 9780982761052. modernistcuisine.com/books/modernist-bread
  Why cited: advanced bread science, equipment, formula design, fermentation, and baking mechanics.

Microbiology and starter ecology

• Academic Landis, E. A., et al. (2021). The diversity and function of sourdough starter microbiomes. eLife 10:e61644. DOI: 10.7554/eLife.61644. elifesciences.org/articles/61644
  Why cited: starter microbial diversity, function, and community variation.
• Academic review Gänzle, M. G. (2014). Enzymatic and bacterial conversions during sourdough fermentation. Food Microbiology. PubMed record
  Why cited: enzymatic, bacterial, acidification, and metabolite context during sourdough fermentation.
• Starter practice The Sourdough Journey, Tom Cucuzza. How to Create a New Sourdough Starter — The Ultimate Guide. Starter guide
  Why cited: practical starter-building sequence, feeding observations, and scale-based home workflow.
• Open reference Hendrik Kleinwächter. The Sourdough Framework. thesourdoughframework.com
  Why cited: open-source sourdough reference for fermentation variables, framework thinking, and wheat sourdough background.

Fermentation control and dough development

• Bulk fermentation The Sourdough Journey, Tom Cucuzza. The Ultimate Sourdough Bulk Fermentation Guide. Bulk fermentation guide
  Why cited: practical dough-temperature and percentage-rise guidance used as a sanity check for rise-time language.
• Dough temperature The Perfect Loaf, Maurizio Leo. The Importance of Dough Temperature in Baking. Dough temperature article
  Why cited: dough temperature as a control variable for fermentation speed, timing, and flavour.
• Technique Hamelman, J. (2012). Bread: A Baker's Book of Techniques and Recipes. ISBN: 9781118132715.
  Why cited: professional baseline for process sequence, preferments, mixing, shaping, and baking.
• Process science Decock, P., & Cappelle, S. (2005). Bread technology and sourdough technology. Trends in Food Science & Technology, 16(1–3), 113–120. ScienceDirect record
  Why cited: background source for sourdough technology and industrial/practical fermentation context supporting general process-sequence claims in this chapter.

Baker's math, hydration, DDT/DWT, and conversions

• Baker's percentage King Arthur Baking Professional. Baker's Percentage. kingarthurbaking.com/pro/reference/bakers-percentage
  Why cited: flour equals 100%; every other ingredient is expressed as a percentage of total flour weight.
• Baker's math King Arthur Baking. What is baker's math, and how can I use it in my everyday bread baking? Baker math article
  Why cited: plain-language support for the Baker's Math Calculator rabbit-hole text.
• Baker's percentage The Perfect Loaf, Maurizio Leo. Introduction to Baker's Percentages. Baker percentages article
  Why cited: formula scaling and comparison context for sourdough bakers.
• Unit conversion King Arthur Baking ingredient weights and NIST Metric Kitchen, cited above.
  Why cited: used only for reference conversions; calculator outputs should still encourage weighing actual ingredients.
• Fermentation kinetics Q10 temperature coefficient (general food-science principle). Q10 temperature coefficient
  Why cited: supports the Rise Time Calculator rabbit-hole explanation that fermentation rate roughly doubles per ~10°C. The calculator is an adjustable field model, not a fermentation law.
• Dough temperature King Arthur Baking. Desired dough temperature. Desired dough temperature article
  Why cited: baseline method for the DDT/DWT rabbit-hole text and the Classic ×3 model — targeting a final dough temperature and solving for water via friction factor.
• DDT model King Arthur Baking. Desired dough temperature. kingarthurbaking.com
  Why cited: the King Arthur ×3 (straight dough: 3×DDT−room−flour−friction) and ×4 (with preferment) models. Verified against KA's worked example (78/72/71/22 → 69°F).
• DDT model Reinhart, Peter. The Bread Baker's Apprentice (p.53, "Desired Dough Temperature").
  Why cited: Reinhart's "240 method" (subtract known factors from 240) is the same Classic ×3 formula — the 240 is desired dough temperature × 3 for the book's standard 80°F dough. Credited as an educator of the classic formula; verified against his example (65+69+30 = 164; 240−164 = 76°F).
• DDT model Leo, Maurizio. The Perfect Loaf (book, p.138) and water-temperature calculator.
  Why cited: the Perfect Loaf 4-factor model, Water = 4×DDT − (flour+levain+ambient+friction). Verified against the book example (78/72/78/72/0 → 90°F).
• DDT model, one of several offered Windmill, LLC — the "Smart DDT" model published on the Rise app's site. bakewithrise.com/ddt, write-up, App Store listing.
  Why cited: this is one of several selectable DDT models in the calculator, alongside the classic ×3/×4 formulas and The Perfect Loaf's model, so bakers can compare approaches. The exponential heat-loss model and its fitted constants originate with Windmill, LLC, and are reproduced here with attribution; Sourjoe makes no claim about which model is most accurate and defers any accuracy claims to the originating source.
• Heat capacity Specific heat of water and dry ingredients (general physical-chemistry reference). Specific heat capacity
  Why cited: the approximate heat capacities (water 4.184, flour ~1.80, salt ~0.86 J/g°C) used in the DDT weighted-heat-balance and the DWT two-water blend model.
• Loaf volume Specific volume and spherical-cap geometry (general reference). Spherical cap volume
  Why cited: the Rise Factor Calculator estimates a domed loaf as a spherical/elliptical cap and reports specific volume (cm³/g) as its rise measure.

Book list

ISBNs are source-listed primary print ISBNs where available. Alternate paperback, e-book, international, and audio editions may have different ISBNs. Two Trevor Jay Wilson items are included because they are useful advanced sourdough references, but no ISBN was located in the author listings reviewed.

How this chapter is organized

The Reference sub-section glossary in The Book of Sourjoe holds 117 short Rabbit Hole entries (Background / Science Fact / Role in Bread Making / Interesting Fact) covering everything from acetic acid to windowpane, plus a set of 32 terms added 15Jul2026 (Ambient Proof through Wild Yeast — see the "Glossary Expansion, 15Jul2026" group below). Most of these draw on the same core food-science and baking texts already cited above (McGee, Calvel, Gänzle, Landis et al., Hamelman, Modernist Bread, The Perfect Loaf). Rather than repeat those citations 117 times, this chapter groups the glossary terms by topic and points each group back to its supporting sources, then lists term-specific sources for named techniques, history, and statistics that needed their own citation. A short list of terms that describe traditional or practitioner knowledge rather than a documented source follows at the end of this chapter.

• Fermentation & microbiology terms Acetic Acid, Acid Load, Amylase, Bulk Fermentation, Degassing, Development, Fermentation, Fermentolyse, Heterofermentative LAB, Homofermentative LAB, Lactic Acid, LAB (Lactic Acid Bacteria), Proteolysis, Retrogradation, Phytic Acid.
  Why cited: general fermentation biochemistry is supported by Gänzle (2014) and Landis et al. (2021), cited above under Culture, Starter & Leaven, plus McGee's On Food and Cooking and Modernist Bread, cited above under Essentials.
• Phytic acid Lopez, H. W., Krespine, V., Guy, C., et al. (2001). Prolonged fermentation of whole wheat sourdough reduces phytate level and increases soluble magnesium. Journal of Agricultural and Food Chemistry, 49(5), 2657–2662. PubMed record
  Why cited: source for the sourdough-vs-yeast phytate reduction comparison. Plain whole-wheat sourdough fermentation reduced phytate by 62%, versus 38% for yeast fermentation; a near-90% reduction was reached only in the study's separate pre-fermented-bran condition. Any glossary figure above roughly 62–65% should be understood as describing that pre-fermented-bran result, not the plain whole-wheat comparison.
• Dough handling technique terms Bassinage, Coil Fold, Elasticity, Extensibility, Folding, Gluten, Hand Mixing, Hydration, Kneading, Slap and Fold, Stretch and Fold, Windowpane.
  Why cited: general gluten and mixing mechanics supported by Hamelman's Bread and Modernist Bread, cited above.
• Bassinage & mixing mechanics The Perfect Loaf, Maurizio Leo. The Ultimate Guide to Mixing Bread Dough. theperfectloaf.com/guides/mixing-bread-dough
  Why cited: describes bassinage (double hydration), gluten oxidation during mixing, and the Rubaud lift-scoop-drop motion in the same terms used in the glossary.
• Rubaud method The Perfect Loaf (cited above); also a long-running The Fresh Loaf community discussion of Gérard Rubaud's Vermont baking background and method. thefreshloaf.com
  Why cited: confirms the technique is named for French-American baker Gérard Rubaud (d. 2018), who baked in Vermont, and that it is used for very wet, high-hydration dough. "Diving arm mixer" and "scooping a cat" are practitioner descriptions in common circulation among baking sites rather than Rubaud's own words; presented here as folk description, not direct quotation.
• Shaping, scoring & equipment terms Banneton/Brotform, Batard, Boules, Couche, Ear, Lame, Peel, Scoring, Oven Spring, Crumb, Dusting Flour.
  Why cited: general shaping and baking mechanics supported by Hamelman's Bread and King Arthur Baking's technique library, cited above.
• Starters, leavens & preferments Barm, Biga, Booster, Discard, Feeding, Float Test, Hooch, Levain, Mother, Natural Leaven, Old Dough, Preferment, Starter.
  Why cited: general starter-care and preferment mechanics supported by The Sourdough Journey, The Sourdough Framework, and Hamelman's Bread, cited above.
• Poolish history Pre-ferment. Wikipedia. en.wikipedia.org/wiki/Pre-ferment; Calvel, R., The Taste of Bread (cited above); Hamelman, J., Bread (cited above).
  Why cited: the "introduced to France by Polish bakers in the 1840s" story for poolish traces back to Calvel and Hamelman, but is treated by food historians as a widely repeated tradition rather than a documented fact, and Wikipedia's Pre-ferment article notes there is no confirmed, sourced explanation for the term's origin. The glossary presents this as a traditional attributed story rather than a settled historical fact.
• Diastatic malt King Arthur Baking. Diastatic malt powder. kingarthurbaking.com/products/diastatic-malt-powder
  Why cited: supports the alpha-amylase / Falling Number / crust-browning mechanism. The glossary's dosing figure is presented as a commonly used starting point rather than a fixed rule, since actual dosing varies with a flour's existing enzyme activity.
• Grain & flour terms Endosperm, Wheat Bran, Wheat Germ, Wheat Grain, Grain Mill, Scalded Flour, Enriched Dough, Tangzhong, Porridge Bread.
  Why cited: general milling and flour-composition claims supported by McGee, cited above.
• Wheat kernel composition Wheat Foods Council. A Kernel of Wheat. wheatfoods.org/resources/wheat-facts/kernel-of-wheat
  Why cited: source for the endosperm ≈83%, bran ≈14.5%, germ ≈2.5% by-weight figures used in the Endosperm, Wheat Bran, Wheat Germ, and Wheat Grain entries. Figures are consistent across independent milling-industry sources.
• Tartine style Robertson, Chad. Tartine Bread. ISBN 9780811870412 (cited above in Sourdough & Bread Books).
  Why cited: direct source for the high-hydration, young-leaven, open-crumb style described in the Tartine glossary entry. Named here as the origin of that specific style; other high-hydration methods in this list (Forkish, Perfect Loaf, Rubaud) are distinct approaches, not variations rated against Tartine.
• Proofing terms Proofing, Over-Proof, Under-Proof, Poke Test, Retarding.
  Why cited: supported by The Sourdough Journey's bulk fermentation guide and Hamelman's Bread, cited above.
• Kvass Kvass. Wikipedia. en.wikipedia.org/wiki/Kvass; A brief history of Kvass, Russia's 'bread in a bottle.' gw2ru.com
  Why cited: supports kvass as an ancient (1,000-year-plus), low-alcohol, fermented rye-bread drink with deep roots in Russian daily life. These sources support the general food-safety principle that fermentation acidity helps suppress harmful microbes; they do not document a historical claim naming cholera and typhoid specifically, so the glossary describes the safety benefit in general terms rather than naming those two diseases.

Glossary Expansion, 15Jul2026 (32 new terms)

These 32 entries were added to close gaps identified by a full pass of the Book's own content (Essentials, Culture/Starter/Leaven, Baker's Process, and the Calculator Tools chapter all used these terms without a Glossary definition) plus a re-check of this Citations page's own source notes. Grouped below by shared source rather than repeated per term.

• DDT/DWT calculator cluster Desired Dough Temperature (DDT), Desired Water Temperature (DWT), Friction Factor (FF) / Total Temperature Factor (TTF), Heat Capacity.
  Why cited: supported by the King Arthur Baking, Reinhart, and Perfect Loaf DDT sources already cited above under Calculator Tools, plus the specific-heat-capacity general physical-chemistry reference already cited there for water (4.184 J/g°C), flour (≈1.80 J/g°C), and salt (≈0.86 J/g°C). Friction-factor ranges (6–8°F hand, 20–24°F stand mixer) verified against King Arthur Baking's "Determining the Friction Factor in Baking." kingarthurbaking.com/blog/2018/08/27/determining-the-friction-factor-in-baking
• Q10 Temperature Coefficient, Inoculation Q10 temperature coefficient (general food-science principle), cited above under Calculator Tools for the Rise Time Calculator.
  Why cited: same source supports both the Q10 glossary entry itself and the Inoculation entry, since inoculation is one of the Rise Time Calculator's four core levers alongside temperature, hydration, and salt.
• Falling Number AACC International Method 56-81B (alpha-amylase / Falling Number method), referenced via the Diastatic Malt citation above.
  Why cited: standard grain-industry test for amylase activity; typical ranges (roughly 200–300s workable, below ~200s indicating sprout damage or high enzyme activity) are consistent across milling-industry references and the King Arthur diastatic malt source already cited.
• Ash Content BAKERpedia. Ash in Flour. bakerpedia.com/processes/ash-in-flour; CooksInfo. Ash Content of Flour. cooksinfo.com/ash-content-of-flour
  Why cited: source for the ash-as-mineral-residue definition, typical white-flour (≈0.4–0.5%) vs. whole-wheat (1.5%+) ranges, and the French T-number (T55/T150) labelling convention.
• Gliadin, Glutenin McGee, H., On Food and Cooking (cited above); Myhrvold, N., et al., Modernist Bread (cited above).
  Why cited: general gluten-protein biochemistry (gliadin's extensibility contribution, glutenin's disulfide-bonded elasticity) supported by the same food-science references already cited for the Gluten entry.
• Culture, Microbial Succession, Kahm Yeast, Wild Yeast Landis, E. A., et al. (2021), The diversity and function of sourdough starter microbiomes, eLife 10:e61644 (cited above); Gänzle, M. G. (2014) (cited above).
  Why cited: same starter-microbiome literature already cited under Culture, Starter & Leaven supports the three-phase succession pattern and the baker's-hands microbiome finding used in the Microbial Succession and Wild Yeast entries.
• Kahm Yeast, species detail Community and practitioner sources on oxidative surface yeasts (Pichia, Candida, Debaryomyces) on fermented foods, consistent across Bake School, Oculyze, and NW Ferments fermentation-safety references.
  Why cited: supports the harmless-but-off-putting characterization and the aerobic, surface-only growth pattern; presented as consistent practitioner/food-safety consensus rather than a single peer-reviewed source.
• San Francisco Sourdough Landis, E. A., et al. (2021) (cited above); academic literature on Fructilactobacillus sanfranciscensis and Kazachstania humilis interactions in sourdough microbiomes.
  Why cited: confirms the current species names (both have been reclassified from their older Lactobacillus/Candida names) and the mutualistic-pairing framing used in the glossary entry.
• Lievito Madre General Italian-baking reference consistent with Sourjoe's own Leaven Calculator hydration-guide content (lievito madre listed there at ~45–50% hydration for panettone/pandoro/colomba).
  Why cited: hydration range and traditional use for enriched Italian celebration breads cross-checked against multiple baking-education sources; presented as well-established practitioner knowledge.
• Starch Gelatinization, Starch Retrogradation, Resistant Starch, Prebiotic, Glycemic Index, Caramelization McGee, H., On Food and Cooking (cited above, starch and sugar chemistry); European Journal of Clinical Nutrition freeze-toast glycemic-response study, referenced via the same finding already summarized in the Book's Post-Bake chapter.
  Why cited: general starch-science background for gelatinization/retrogradation is the same McGee reference already cited throughout Essentials and Reference; the ~40% reduced blood-glucose-response figure for toasting frozen bread is drawn from the peer-reviewed nutrition literature summarized in that chapter.
• Terroir General agricultural/milling-industry usage, consistent with the Book's own Grains A to Z "Grain & Milling Compendium" content on hard vs. soft wheat regions and ancient-grain lineages.
  Why cited: presented as established cross-industry terminology (borrowed from winemaking) rather than a single-source claim.
• Ambient Proof, Bench Rest, Caramelization, Dividing, Discard Jar, Mise en Place, Pre-shape, Quiescence, Thermal Lag Hamelman, J., Bread (cited above); The Sourdough Journey, Tom Cucuzza, bulk fermentation guide (cited above).
  Why cited: general Baker's Process staging, timing, and cold-retard mechanics supported by the same process-sequence references already cited under Baker's Process.

Source status: traditional/practitioner knowledge, not yet a primary citation

A handful of Reference sub-section entries describe long-standing baker's tradition or practitioner technique rather than a documented, checkable source. Per the source-use policy above, these are presented in the glossary as "traditionally said" / "often described as" rather than as settled fact, and are listed here for transparency rather than attributed to a specific source.

• Desem — the cool-temperature, low-hydration mechanism and the "buried in a sack of flour for weeks" tradition is widely repeated in home-baking circles as practitioner technique rather than a documented, sourced claim.
• Maslin flour — the wheat/rye intercropping-as-insurance-policy history is plausible agricultural tradition; the specific etymology and the mycorrhizal-fungi/nutrient-uptake mechanism are presented as general background rather than a claim tied to one source.
• SCOBY / sourdough-as-biofilm — the biofilm framing is consistent with the starter-microbiome literature cited above (Landis et al. 2021), but the direct sourdough-to-kombucha SCOBY comparison is a practitioner analogy rather than a term used in that literature.
• Tangzhong — the gelatinization-temperature and staling-inhibition mechanism follow general starch science (McGee, cited above); the specific water-ratio and hydration-handling comparisons are practical baking guidance rather than a single-source claim.

Disclaimer, allergens, nutrition, and gluten-free claims

• Canadian Food Inspection Agency. Allergen-free, gluten-free and cross-contamination claims.
• Health Canada. Gluten-free labelling claims and the 20 ppm gluten threshold for specially produced gluten-free oats.
• U.S. Food & Drug Administration. Guidance on developing and using databases for nutrition labelling; lab analysis is recommended for label nutrient values.
• King Arthur Baking. Allergen program and cross-contact caution language.
• Bread Dad. Recipe safety and allergen disclaimer language for bread recipes.
• Allergy UK. Recipe disclaimer language on untested recipes, nutrition value, suitability, and food labels.
• Children's Hospital of Philadelphia. Recipe disclaimer language on variation in recipe outcomes and nutrition.
• Beyond Celiac. Celiac disease myth guidance: wheat-based sourdough is not safe for celiac disease.