Abstract:The crude polyphenol extract was obtained by leaching 60%ethanol aqueous solution from the passion fruit passionflower bark produced in Maoming.The polyphenol substance contained in the crude extract was qualitatively analyzed by liquid-mass spectrometry.The salicylic acid method，DPPH free radical scavenging ability，pyrogallol auto-oxidation method and IC50 value were used to evaluate the antioxidant activity of crude polyphenol extracts.The POV value method was used to evaluate the application effect of crude polyphenol extracts on peanut oil.The results showed that the peel ethanol crude extract was detected 14 polyphenols，13 of them were identified，respectively，quercetin，epigallocatechin，rutin，kaempferol，resveratrol，polydatin，gallic acid，epicatechin，isoorientin，orientin，luteolin，Vitexin and isovitexin.Taking VCas a control，under the same mass concentration，the scavenging effect of peel polyphenols on hydroxyl radicals and superoxide anion radicals is better than VC，and the scavenging effect on DPPH radicals was weaker than VC.Under the same control system，the IC50values of peel polyphenols for scavenging hydroxyl radicals，superoxide anion radicals，and DPPH radicals are 0.328，0.696 and 0.328 mg/mL，and the IC50values of VCare 3.305，15.850 and 0.007 mg/mL.Compared with Catechin，the antioxidant effect of passion fruit peel polyphenols on peanut oil is not as good as catechin，but it also has a better protective effect.The amount of 0.75%can keep peanut oil in POV within 48 hours under test conditions and the value is basically stable and unchanged.The oxidation inhibition rate reaches 33.33%，and the antioxidant effect increases with the increase of the dosage.