POTATO PEEL WASTE - STABILITY AND ANTIOXIDANT ACTIVITY OF A FREEZE-DRIED EXTRACT

Aqueous extracts of potato peel waste were freeze-dried. High performa nce liquid chromatography (HPLC) of the freeze-dried extracts revealed that chlorogenic (50.31%), gallic (41.67%), protocatechuic (7.81%), a nd caffeic (0.21%) acids were the major phenolics. During 15 days stor age of the freeze-dried extract, no degradation of phenolics occurred. After 4 days storage at 63 degrees C, 5.00g of sunflower oil containi ng either the freeze-dried extract (200 ppm) or butylated hydroxyaniso le (BHA) (200 ppm) reached peroxide values (PV) of 37.38 and 37.47 meg kg(-1) respectively. L-ascorbic acid-6-palmitate was the best antioxi dant (PV= 10.65 meg kg(-1)) but the freeze-dried extract was as good a s BHA.