Mash Protocol 3 (Proposed): The Maltose Mash
Mash Protocol 1 is our proven baseline; use it. This page is different in kind: a design we believe is the logical next step, assembled from our production experience, the enzyme literature, and the sugar chemistry on The Sugar Bible — and never run as written. Every number below is a starting hypothesis, not a validated target. If you run it, you are the experiment. We want to hear what happened.
Why a third protocol
MP1 works. It liquefies hot, converts hard, and finishes with a glucoamylase — which means it produces a glucose-forward wort. That was a deliberate trade for reliability and attenuation, and it still is. But it carries the known costs of glucose-heavy wort: a hot fermentation start that can stumble late, a drier beer than some styles want, and a yeast working against its own sugar-uptake order the whole way (the mechanism is on The Sugar Bible).
Conventional barley wort is maltose-forward, and yeast is at its best fermenting it. Sorghum malt cannot build that profile natively — its beta-amylase is too weak, which is the founding fact of our whole enzyme doctrine. But the external-enzyme toolbox has a maltose-leaning tool: fungal alpha-amylase. MP3 is the design that uses it.
The hypothesis in one sentence: a sorghum mash can produce a conventional maltose-forward wort — with better fermentation behavior, better yeast health, and a more beer-like finish — by trading MP1's glucoamylase for a fungal alpha-amylase and giving the yeast a proper protein rest.
The design sketch
Four moves, two of them straight from MP1's proven spine:
| Stage | Hypothesis | Reasoning |
|---|---|---|
| 1. Protein rest | Mash in around 122–140°F (50–60°C), thin (~2.6 L/kg), with a protease-containing enzyme; rest ~20–30 min | Sorghum wort runs short on free amino nitrogen. A real protease rest at working temperature builds FAN for the yeast and loosens grain structure ahead of liquefaction — work MP1's hot mash-in skips past |
| 2. Liquefy | Ramp to the 190°F (88°C) hold with bacterial alpha-amylase, per the proven baseline | Unchanged from MP1 — this is the spine we trust, and the 190°F baseline evidence carries it |
| 3. Convert for maltose | Cool back further than MP1 — to ~132°F (56°C) — adjust pH toward ~5.2, add fungal alpha-amylase; hold to conversion | Fungal alpha builds a maltose-forward profile but is heat-fragile: it needs the cooler hold MP1 never visits, and it works best at the lower pH |
| 4. Mash out | Raise to 180°F (82°C) | Hot enough to end enzyme work cleanly before lauter — conservative by design |
What MP3 deliberately drops: the glucoamylase. What it deliberately keeps: the hot liquefaction, the continuous stirring, the iodine endpoint, the records discipline — everything that made MP1 trustworthy.
What would have to be true
The design stands on four claims, each testable and each honestly unproven at scale:
- The protease rest raises wort FAN meaningfully in a sorghum mash — measurable by a before/after FAN assay.
- Fungal alpha at ~132°F converts a liquefied sorghum mash to target gravity in production time — measurable by gravity and hold length.
- The resulting wort is genuinely maltose-forward — measurable by an HPLC sugar profile.
- The fermentation improves: steadier attenuation curve, cleaner finish, healthier yeast crops — measurable against an MP1 control batch of the same recipe.
A fifth, softer claim rides along: a maltose wort plus better FAN should improve the finished beer's balance and head — worth scoring, hard to prove.
How to run it as a research project
Run it as a comparison or do not bother: the same recipe through MP1 and MP3, everything else held still, judged on FAN, sugar profile, fermentation curve, finished gravity, flavor, and foam. One batch is an anecdote. A repeat across malt lots is a result. Bench scale first — the malt-lab mash process is the right harness — and the validation checklist on the 190°F baseline page applies to every claim above.
If you run this — at any scale — we want the data, whichever way it went. A failed run documented honestly is worth more to this site than a success story without numbers.
Related Pages
- The Sugar Bible
- Mash Protocol 1: Enzyme Mash
- Mash Protocol 2: Decoction/Cereal Mash
- External Enzymes
- Yeast Nutrition
- Why the 190°F / 60-Minute Baseline Exists
Source and Validation Notes
This proposal is Gluten Free Brewer's own synthesis: it combines Bard's commercial production experience (the liquefaction spine, the records discipline), published enzyme and yeast-fermentation science, and standard industry mashing practice into a design we believe is the logical next protocol. It has never been run as written, at any scale, by us or anyone we know of. Nothing here is a validated specification; every value is a hypothesis stated so it can be tested and, if wrong, corrected in public.