Relation between antioxidant and components of potato protein hydrolysate

Fenton system was used to catalyze lipid oxidation in the O/W emulsion.2-thiobarbituric acid reactive substances(TBARS)were used as indicator for lipid oxidation.Potato protein hydrolysate(PPH)with different hydrolysis time of 0.5,1 and 6h were used as co-emulsifier with Tween 20 for emulsion preparation.The oxidation stability of the emulsions was investigated.1h PPH showed the highest antioxidant ability.1h PPH was then separated using G15 gel filtration.Three fractions were collected.The low molecular weight fraction showed better antioxidant ability estimated using ABTS scavenging ability and Fe2+ chelating ability.The higher antioxidant ability was according to their higher content of the amino acid to be oxidized.