Lipases

Lipases are enzymes that catalyse the hydrolysis of lipids — fats and oils — into their component fatty acids and glycerol. In bread-making, endogenous flour lipases and added microbial lipases modify the small but important lipid fraction of wheat flour, releasing lysophospholipids and other amphiphilic lipid derivatives that interact with gluten proteins and starch to improve dough structure and bread quality. The result is a larger loaf volume, more even crumb structure, and improved texture and shelf life. Lipases have been adopted by commercial bakers as a natural alternative to synthetic emulsifiers such as mono- and diglycerides.

No JECFA numerical ADI is assigned to lipases as food additives. As enzymes (proteins), they are denatured during baking and subsequently digested to amino acids. Lipases are ubiquitous in human physiology — pancreatic lipase is essential for fat digestion — and no toxicological concern arises from dietary exposure to food-grade lipase preparations.

Lipases are approved in the EU as E1104 for use in bread-making and flour treatment. They are produced by fermentation from various microbial sources including Aspergillus, Rhizopus, and Candida species, each with distinct specificity profiles that are matched to specific food applications. In the brewing and dairy industries, lipases are also used to modify fat profiles for flavour development in certain cheese styles. For consumers, lipase activity in bread-making is functionally transparent — the enzyme has no direct effect on taste, colour, or nutritional composition of the finished product, and its commercial value is entirely in improving baking performance and extending shelf life.