title: Polyphenolic contents and antioxidant properties of different grape (V. vinifera, V. labrusca, and V. hybrid) cultivars.
abstract: The polyphenolic contents and the antioxidant activity of the skins and pulps of different grape cultivars were estimated using HPLC and DPPH antioxidant assay, respectively. The phenolics and flavonoids identified were quercetin, kaempferol, caffeic acid, p-coumaric acid, cinnamic acid, and (-)-epicatechin. The total phenolic contents were found to be the highest in the grape skin of Flouxa (>400 mg/100 g), followed by Campbell Early and Tamnara (>300 mg/100 g), and then by Red Globe and Ruby Seedless (>250 mg/100 g), and the total phenolic content was the lowest in Italia and Delaware (<60 mg/100 g). The antioxidant activities of the grape extracts varied from 12.5% (Ruby Seedless) to 60.2% (Hongiseul) for skins, whereas the antioxidant activities of the grape extracts varied from 35.4% (Campbell Early) to 84.5% (Hongiseul) for pulps. The grape pulps have stronger antioxidant activities than those of the grape skins. Our results suggest that the phenolic and flavonoid contents in extracts of grape skins and pulps showed statistically significant correlations with the free radical scavenging activity.
authors.affiliation: Department of Molecular Biotechnology, College of Life and Environmental Sciences, Konkuk University, Seoul 143-701, Republic of Korea.
authors.forename: Shivraj Hariram
authors.initials: SH
authors.lastname: Nile
authors.forename: S H
authors.initials: SH
authors.lastname: Kim
authors.forename: Eun Young
authors.initials: EY
authors.lastname: Ko
authors.forename: Se Won
authors.initials: SW
authors.lastname: Park
mesh_terms: D000975:Antioxidants / Q000737:chemistry* / Q000378:metabolism; D002109:Caffeic Acids / Q000737:chemistry; D003373:Coumaric Acids / Q000737:chemistry; D016166:Free Radical Scavengers / Q000737:chemistry; D044949:Kaempferols / Q000737:chemistry; D059808:Polyphenols / Q000145:classification* / Q000302:isolation & purification; D011422:Propionates; D011794:Quercetin / Q000737:chemistry; D027843:Vitis / Q000737:chemistry* / Q000378:metabolism
chemical_list: D000975:Antioxidants; D002109:Caffeic Acids; D003373:Coumaric Acids; D016166:Free Radical Scavengers; D044949:Kaempferols; D059808:Polyphenols; D011422:Propionates; C006552:kaempferol; D011794:Quercetin; C495469:p-coumaric acid; C040048:caffeic acid
references.citation: Free Radic Res. 2002 Nov;36(11):1199-208
references.pmid: 12592672
references.citation: Mol Cell Biochem. 2001 May;221(1-2):79-87
references.pmid: 11506190
references.citation: Chem Biol Interact. 2000 Jun 15;127(1):45-59
references.pmid: 10903418
references.citation: J Agric Food Chem. 2000 Feb;48(2):220-30
references.pmid: 10691619
references.citation: J Agric Food Chem. 1999 Oct;47(10):3954-62
references.pmid: 10552749
references.citation: Ann Nutr Metab. 1997;41(6):353-7
references.pmid: 9491190
references.citation: J Agric Food Chem. 2000 Feb;48(2):140-6
references.pmid: 10691606
references.citation: Arch Intern Med. 1996 Mar 25;156(6):637-42
references.pmid: 8629875
references.citation: Life Sci. 1999;65(4):337-53
references.pmid: 10421421
references.citation: J Chromatogr A. 2000 Jun 9;881(1-2):461-9
references.pmid: 10905728
references.citation: Diabetes Care. 2004 Feb;27(2):362-6
references.pmid: 14747214