Beta Amylase for Light Beer and Low-Calorie Fermentability
Maximise wort fermentability for light beer, low-calorie lager, and low-alcohol beer by supplementing beta amylase activity — converting residual dextrins into yeast-fermentable maltose.
Light beer and low-calorie lager are defined by what they do not contain: residual fermentable sugars and dextrins that contribute calories. Producing a light beer at 85–92% apparent attenuation — versus 72–78% for standard lager — requires that nearly all wort carbohydrates be converted to fermentable sugars that yeast can metabolise completely. Standard mashing conditions and malt enzyme levels cannot achieve this without process modification: the enzyme system simply does not produce enough maltose and glucose at normal saccharification temperatures to push attenuation to the levels required for a true light or ultra-light beer.
Beta amylase for light beer fermentability is the primary enzymatic tool to drive wort attenuation toward the maximum possible level. Operating at pH 4.5–6.0 and 55–65°C, exogenous beta amylase at high dosage (1.5–4.0 kg/t grist) is added during mashing to convert as much of the starch-derived dextrin as possible into maltose. In addition, amyloglucosidase (glucoamylase) is frequently added to the mash or fermentation tank to further hydrolyse the residual alpha-limit dextrins that beta amylase cannot bypass due to their α-1,6 branch points.
In the classic approach to ultra-light lager production pioneered in North American brewing, the wort is mashed at a low temperature (60–63°C) to maximise both native and exogenous beta amylase activity, then the temperature steps to 72°C for mash-out to inactivate all remaining amylase and lock in the sugar profile. Exogenous glucoamylase is then added to the fermentation vessel itself to continue hydrolysing residual dextrins during fermentation, achieving apparent attenuation values of 90–95% in ultra-light beer. The result is a beer with 40–60% fewer calories than standard lager, achieved through near-complete fermentation of all available carbohydrates.
Brewery procurement teams source beta amylase for light beer on high declared activity, temperature stability at mash conditions, compatibility with glucoamylase and brewing adjunct materials, and food-grade documentation. COA, TDS, HALAL, and KOSHER documents are available per lot. MOQ 25 kg.
Low-Temperature Mashing for Maximum Beta Amylase Activity
Light beer production begins with a mash temperature of 60–63°C — lower than standard lager mashing — to maximise the activity window of both endogenous malt beta amylase and exogenous supplemental enzyme. At this temperature, exogenous beta amylase at 1.5–3.0 kg/t grist has maximum activity and produces the highest maltose level achievable before mash-out. The resulting high-maltose wort ferments fully, producing a beer with very low residual extract and reduced calorie content.
Extended Beta Amylase Saccharification Rest
For breweries using standard mash temperature but targeting higher attenuation than normal, an extended saccharification rest at 62–65°C for 90–120 minutes (instead of the standard 60 minutes) with exogenous beta amylase at 1.0–2.0 kg/t grist allows more complete maltose production. This approach requires no change to mash equipment but does lengthen the mash cycle. The resulting wort has 3–5% higher fermentable content than the same grist at standard saccharification time, translating directly to higher apparent attenuation in the finished beer.
Combined Mash + Fermentation Enzyme Strategy
The most effective strategy for ultra-light lager (90–95% apparent attenuation) combines high-dose exogenous beta amylase in the mash (1.5–4.0 kg/t grist at 60–63°C) with glucoamylase addition to the fermentation vessel at pitching. The beta amylase maximises maltose production during mashing; the glucoamylase continues to hydrolyse any residual dextrins that pass into the fermenter, producing glucose that yeast metabolises as fermentation proceeds. This tandem approach is used commercially in North American ultra-light lager and is the established method for achieving <95 kcal per 330 mL beer specifications.
Low-Alcohol Beer (0.5–2.5% ABV) Wort Preparation
Low-alcohol beer (LAB) production requires wort with controlled fermentability — either naturally low (produced by mashing at high temperature to generate mostly dextrins and limit fermentable sugar) or full-gravity wort that is then dealcoholised. For dealcoholisation route LAB, standard wort fermentability does not disadvantage the process. For the low-original-gravity route, targeted enzyme use allows brewers to control exactly how much of the wort is fermentable, producing beers of 0.5–2.5% ABV without vacuum dealcoholisation capital investment.
| Parameter | Value |
| Activity range | 50,000 – 150,000 U/g (multiple grades) |
| Optimal pH | 4.5 – 6.0 |
| Optimal temperature | 55°C – 65°C |
| Form | White to light yellow powder |
| Shelf life | 12 months (sealed, cool, dry place) |
| Packaging | 25 kg fiber drums |
Frequently Asked Questions
What apparent attenuation can I achieve with exogenous beta amylase in light beer?
With optimised mashing conditions (60–63°C, pH 5.2–5.5, 90–120 min) and exogenous beta amylase at 2.0–4.0 kg/t grist, apparent attenuation of 85–90% is achievable in the mash alone. Adding glucoamylase to the fermentation vessel in addition to beta amylase in the mash can push apparent attenuation to 92–96% in ultra-light lager production. Standard malt mashing without enzyme supplementation typically achieves 72–78% apparent attenuation — the gap between these values represents the calorie reduction achievable through enzymatic optimisation.
Should I use beta amylase in the mash or in fermentation for light beer?
Beta amylase belongs in the mash, where its optimal activity range (55–65°C) is matched to mash saccharification conditions. It is inactivated at fermentation temperatures (10–20°C for lager) and is not active in the fermenter. Glucoamylase, not beta amylase, is the enzyme added to the fermentation vessel to continue dextrin hydrolysis during fermentation. The most effective light beer strategy uses both: beta amylase in the mash to maximise maltose production during saccharification, and glucoamylase in the fermenter to scavenge residual alpha-limit dextrins that beta amylase could not break down.
Is exogenous beta amylase compatible with glucoamylase in light beer production?
Yes. Beta amylase and glucoamylase are fully compatible and have additive effects on starch saccharification in the mash. Beta amylase releases maltose; glucoamylase releases glucose from the same starch ends and can bypass α-1,6 branch points. Both can be dosed simultaneously in the mash, or beta amylase can be used in the mash and glucoamylase reserved for fermentation vessel addition. In the fermenter, only glucoamylase is active (beta amylase is inactive at fermentation temperatures). For maximum light beer fermentability, the combined mash + fermenter enzyme approach is standard practice.
What documentation is needed to use beta amylase in food-grade beer production?
Beta amylase for brewing must be supplied with food-grade documentation including COA (activity, moisture, microbial limits, heavy metals), TDS, and HALAL/KOSHER certificates if required by market or customer. For breweries supplying certified organic beer, the enzyme source (barley or soybean extraction vs microbial production) and organic certification status must be confirmed. Our beta amylase is supplied with full food-grade documentation, and HALAL/KOSHER certificates are available per lot. Allergen declarations (soy or barley content) are included in the TDS for regulatory purposes.
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