Initiation Mechanisms • Initiated by enzymes called lipoxygenases – Inactivate by blanching (short heating to denature enzymes) • Metal ions (e.g. Fe, Co, Cu) can also initiate reaction – found naturally in foods, from metal equipment – Prevent using chelating agents such as EDTA or citric acidInitiation Mechanisms • Initiated by enzymes called lipoxygenases – Inactivate by blanching (short heating to denature enzymes) • Metal ions (e.g. Fe, Co, Cu) can also initiate reaction – found naturally in foods, from metal equipment – Prevent using chelating agents such as EDTA or citric acid