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The integration of exogenous enzymes into the production workflow often raises logistical questions in the brewhouse: should they be added to the mash tun during mashing, at yeast pitching, or directly during fermentation?
Using the right enzyme at the wrong moment – or at the wrong temperature – can completely neutralize its protein activity. To optimize your recipes, maximize your yields, and solve technical bottlenecks, here is a decision guide explaining exactly when and how to add your enzymes at each stage of the brewing process.
Find all our precision enzyme references in our professional catalogue dedicated to brewing enzymes.
1. During mashing: To improve filtration and convert difficult starches
Adding enzymes directly into the mash tun (or the kettle) is recommended whenever the grain bill creates a technical challenge for the brewhouse:
- When to use it? If large quantities of raw cereals are present (corn, rice, wheat) or for recipes containing more than 20% cereals rich in beta‑glucans (oats, rye, malted wheat).
- Which enzymes to add?Beta‑Glucanase / Xylanase to break down gums and prevent stuck mash or clogged grain beds, or Thermostable Alpha‑Amylase during high‑temperature gelatinization of raw cereals.
- Mode of action: Add directly during mashing (between 45°C and 65°C depending on the enzyme). Be sure to perform a rigorous mash‑out at 78°C if you want to deactivate the enzyme and lock in your wort body profile.
2. At yeast pitching: To secure flavor profile and tank turnover
Adding enzymes during the transfer of chilled wort into the fermenter, at the same time as yeast pitching, aims to prevent defects and accelerate maturation:
- When to use it? At the very beginning of primary fermentation, allowing the enzyme to work synergistically with yeast metabolism.
- Which enzymes to add?
- ALDC (Alpha‑Acetolactate Decarboxylase): To block diacetyl formation. Essential for fast‑turnaround lagers or IPAs prone to Hop Creep.
- Prolyl‑Endopeptidase (Clarity Ferm): To degrade gluten and prevent chill haze formation.
- Mode of action: Inject directly into the wort‑to‑fermenter transfer line or into the tank during inoculation. The enzyme works at fermentation temperature (10°C – 22°C) throughout the active phase.
3. During active fermentation or conditioning: To dry out the beer or enhance hop aroma
Some enzymes are specifically designed to restructure remaining sugars or release complex aromatic compounds inside the fermenter:
- When to use it? At the start of fermentation or during dry hopping.
- Which enzymes to add?
- Amylo‑Glucosidase (Glucoamylase): Added during fermentation to break down all residual dextrins and reach a final gravity of 1.000 (ideal for Brut IPAs or very dry beers).
- Beta‑Glucosidase / Beta‑Lyase: Added during dry hopping to achieve biotransformation of thiol and monoterpene precursors contained in hops.
- Mode of action: Mix the enzyme with a small volume of wort or sterile degassed water before adding it to the top of the fermenter.
4. Decision tree: Which enzyme to use for your professional brewing issue?
| Brewhouse Problem / Objective | Recommended Enzyme | Injection Moment | Technical Attention Point |
|---|---|---|---|
| Very slow filtration or stuck mash | Beta‑Glucanase | Mash tun (45°C – 65°C) | Sensitive to temperatures above 70°C. |
| Risk of buttery off‑flavor (Diacetyl) / Fast lagers | ALDC | Yeast pitching (fermenter transfer) | Must be added BEFORE diacetyl is produced by yeast. |
| Producing gluten‑free or ultra‑bright beer | Prolyl‑Endopeptidase | Yeast pitching (fermenter transfer) | Maintains excellent foam stability when dosed correctly. |
| Targeting minimal final gravity (FG = 1.000) | Amylo‑Glucosidase | Mashing or early fermentation | If added in fermenter, it will continue increasing attenuation until the end. |
Rolling Beers Pro Technical Team Insight
Always control the inactivation temperature! Enzymes are biological catalysts subject to strict denaturation rules. If you use an enzyme in the fermenter (such as Amylo‑Glucosidase) and perform pasteurization or extended conditioning without filtration, make sure you know its denaturation temperature. Conversely, if you want to stop the action of a mashing enzyme, a 10‑minute mash‑out at at least 78°C is mandatory. An enzyme that is not inactivated in a bottle‑conditioned beer can destroy all remaining dextrins and cause dangerous over‑carbonation (gushing) in packaged products!