Question

Explain how antioxidants function to prevent oxidative rancidity.

Answer 1

Oxidative rancidity is a chemical reaction catalyzed by heat, ultraviolet light, heavy metals and oxygen. Many of these factors are obviously present during the extrusion process. Oxidative rancidity is best controlled by the addition of antioxidants and ‘oxygen scavengers’. Most antioxidants are added before extrusion even though there may be minor destruction during the process depending on the time and temperatures employed. There is a growing trend to utilize natural antioxidants such as mixed tocopherols, rosemary, and other unique ingredients. Often an ‘antioxidant package’ containing antioxidants and oxygen scavengers are used in synergy. Oxygen scavengers such as ascorbic and citric acid appear to increase the effectiveness of antioxidants.