title: Antioxidant activity of papaya seed extracts.
abstract: The antioxidant activities of the ethanol, petroleum ether, ethyl acetate, n-butanol and water extract fractions from the seeds of papaya were evaluated in this study. The ethyl acetate fraction showed the strongest DPPH and hydroxyl free radical-scavenging activities, and its activities were stronger than those of ascorbic acid and sodium benzoate, respectively. The n-butanol fraction demonstrated the greatest ABTS⁺ radicals scavenging activity. The ethyl acetate fraction and the n-butanol fraction not only showed higher antioxidant activities than the petroleum ether fraction, water fraction and ethanol fraction, but also showed higher superoxide anion and hydrogen peroxide radicals scavenging activities than those of the other extract fractions. The high amount of total phenolics and total flavonoids in the ethyl acetate and n-butanol fractions contributed to their antioxidant activities. The ethyl acetate fraction was subjected to column chromatography, to yield two phenolic compounds, p-hydroxybenzoic acid and vanillic acid, which possessed significant antioxidant activities. Therefore, the seeds of papaya and these compounds might be used as natural antioxidants.
authors.affiliation: Key Laboratory of Protection and Development Utilization of Tropical Crop Germplasm Resources (Hainan University), Ministry of Education, Haikou 570228, China.
authors.forename: Kaibing
authors.initials: K
authors.lastname: Zhou
authors.forename: Hui
authors.initials: H
authors.lastname: Wang
authors.forename: Wenli
authors.initials: W
authors.lastname: Mei
authors.forename: Xiaona
authors.initials: X
authors.lastname: Li
authors.forename: Ying
authors.initials: Y
authors.lastname: Luo
authors.forename: Haofu
authors.initials: H
authors.lastname: Dai
mesh_terms: D020001:1-Butanol / Q000737:chemistry; D000085:Acetates / Q000737:chemistry; D000473:Alkanes / Q000737:chemistry; D001713:Biphenyl Compounds / Q000037:antagonists & inhibitors* / Q000378:metabolism; D029441:Carica / Q000737:chemistry*; D002626:Chemistry, Pharmaceutical / Q000379:methods*; D002850:Chromatography, Gel; D000431:Ethanol / Q000737:chemistry; D005419:Flavonoids / Q000737:chemistry; D016166:Free Radical Scavengers / Q000032:analysis / Q000737:chemistry / Q000494:pharmacology; D017665:Hydroxyl Radical / Q000037:antagonists & inhibitors* / Q000378:metabolism; D010226:Parabens / Q000494:pharmacology; D010851:Picrates / Q000037:antagonists & inhibitors* / Q000378:metabolism; D010936:Plant Extracts / Q000032:analysis / Q000737:chemistry / Q000494:pharmacology; D012639:Seeds / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D014641:Vanillic Acid / Q000494:pharmacology; D014867:Water / Q000737:chemistry
chemical_list: D000085:Acetates; D000473:Alkanes; D001713:Biphenyl Compounds; D005419:Flavonoids; D016166:Free Radical Scavengers; D010226:Parabens; D010851:Picrates; D010936:Plant Extracts; D012997:Solvents; D014867:Water; D017665:Hydroxyl Radical; D000431:Ethanol; C007650:ethyl acetate; D020001:1-Butanol; C004931:1,1-diphenyl-2-picrylhydrazyl; D014641:Vanillic Acid; C038193:4-hydroxybenzoic acid; C004544:naphtha