Enzymes play essential roles in both baking and brewing, either as naturally occurring components of raw materials or as added processing aids. In baking, enzymes improve dough handling properties, enhance bread volume and crumb structure, extend shelf life, and enable the replacement of chemical additives. In brewing, enzymes facilitate mash conversion, improve fermentation efficiency, enhance beer clarity, and contribute to flavor stability. The use of enzymes in both industries has grown substantially as manufacturers seek to reduce reliance on chemical additives and improve process efficiency.
In baking, alpha-amylases from fungal sources are the most widely used enzymes. They hydrolyze damaged starch granules in wheat flour into dextrins, providing fermentable sugars for yeast and improving bread volume, crust color, and shelf life. Xylanases (hemicellulases) break down arabinoxylans in the cell wall of wheat endosperm, increasing dough extensibility, improving oven spring, and enhancing crumb structure. Lipases improve dough stability and bread volume by modifying polar lipids, producing emulsifying compounds in situ, and contributing to crumb softness. Glucose oxidase cross-links gluten proteins through hydrogen peroxide generation, strengthening dough for high-speed processing and improving bread volume.
Proteases in baking are used selectively depending on the product. In bread and roll production, limited proteolysis weakens gluten to improve dough extensibility and reduce mixing time. In cracker and biscuit production, more extensive proteolysis is desirable to reduce gluten strength and prevent shrinkage. Asparaginase is a specialized enzyme added to reduce acrylamide formation in baked goods by converting asparagine into aspartic acid and ammonia before the Maillard reaction occurs. This application has gained regulatory and consumer attention as acrylamide is classified as a probable human carcinogen.
In brewing, beta-glucanase degrades barley beta-glucans during mashing, reducing wort viscosity and improving filtration rates and extract yields. Alpha-amylases and limit dextrinase convert starch to fermentable sugars during mashing, while beta-amylase produces maltose from the non-reducing ends of starch chains. Proteases reduce haze formation by degrading haze-active proteins, improve foam stability by modifying protein profiles, and release free amino nitrogen (FAN) for yeast nutrition. Amyloglucosidase is added in light beer production to fully convert dextrins to fermentable sugars, reducing residual carbohydrate content and caloric value. Enzymes in baking and brewing are a major application of industrial enzymes. Brewing enzymes facilitate starch conversion during mashing, while yeast fermentation converts sugars to ethanol. Immobilized enzymes are increasingly used in continuous brewing processes.
