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.
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.