Losses of natural antioxidants in relation to processing conditions and
the formation of Maillard reaction products have been studied in coffee
brews and tomato puree.21 The antioxidant activities of both these evaluated
food commodities were enhanced as the roasting time and temperature
increased. In conclusion, although natural antioxidants are partially
lost during heating, the overall antioxidant properties of heated foods can
be maintained or even enhanced by the development of new antioxidants,
such as Maillard reaction products.