Glucose oxidase

Glucose oxidase is an enzyme that catalyses the oxidation of glucose to glucono-delta-lactone with simultaneous consumption of molecular oxygen and generation of hydrogen peroxide. In bread-making and flour treatment, the hydrogen peroxide produced by glucose oxidase acts as a mild oxidising agent that strengthens gluten protein networks by promoting the formation of disulphide bonds between gluten proteins. This results in dough with improved gas-holding capacity, better tolerance to mechanical processing, and increased loaf volume. Glucose oxidase provides a natural alternative to chemical dough oxidising agents such as potassium bromate (E924), which is banned in the EU.

No JECFA numerical ADI is assigned to glucose oxidase as a food additive. As a protein, glucose oxidase is denatured during baking and is completely digested to amino acids during normal digestion. The hydrogen peroxide it generates during dough processing is short-lived and does not persist into the finished baked product.

Glucose oxidase is approved in the EU as E1102 and in other markets for use in bread-making. Its use grew significantly as regulators around the world phased out chemical oxidising agents, and it is now a standard component of many commercial bread-making enzyme cocktails. It is typically produced by fermentation of Aspergillus niger, a well-characterised production organism. For consumers, glucose oxidase is functionally transparent — it has no effect on the flavour, colour, or nutritional profile of the finished bread, and its role is entirely structural during the dough preparation and baking stages. It is considered an environmentally and toxicologically benign processing aid.