title: Riboflavin Phototransformation on the Changes of Antioxidant Capacities in Phenolic Compounds.
abstract: Eight phenolic compounds including: p-coumaric acid, vanillic acid, caffeic acid, chlorogenic acid, trolox, quercetin, curcumin, and resveratrol were treated with riboflavin (RF) photosensitization and in vitro antioxidant capacities of the mixtures were determined by 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2' azino bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS), and ferric reducing antioxidant power (FRAP) assays. Mixtures containing p-coumaric acid and vanillic acid under RF photosensitization showed increases in ferric ion reducing ability and radical scavenging activity of DPPH, whereas mixtures of other compounds had decreases in both radical scavenging ability and ferric reducing antioxidant power. Hydroxycoumaric acid and conjugated hydroxycoumaric and coumaric acids were tentatively identified from RF photosensitized p-coumaric acid, whereas dimmers of vanillic acid were tentatively identified from RF photosensitized vanillic acid. RF photosensitization may be a useful method to enhance antioxidant properties like ferric ion reducing abilities of some selected phenolic compounds.
authors.affiliation: Dept. of Food Science and Biotechnology, Sungkyunkwan Univ, Suwon, Republic of Korea.
authors.forename: Juhee
authors.initials: J
authors.lastname: Song
authors.affiliation: Dept. of Food Science and Biotechnology, Sungkyunkwan Univ, Suwon, Republic of Korea.
authors.forename: Nam Gyu
authors.initials: NG
authors.lastname: Seol
authors.affiliation: Dept. of Food and Nutrition, Kangwon National Univ, Samcheok, Republic of Korea.
authors.forename: Mi-Ja
authors.initials: MJ
authors.lastname: Kim
authors.affiliation: Dept. of Food Science and Biotechnology, Sungkyunkwan Univ, Suwon, Republic of Korea.
authors.forename: JaeHwan
authors.initials: J
authors.lastname: Lee
mesh_terms: D000975:Antioxidants / Q000737:chemistry / Q000494:pharmacology*; D052160:Benzothiazoles / Q000378:metabolism; D001713:Biphenyl Compounds / Q000378:metabolism; D002109:Caffeic Acids / Q000737:chemistry / Q000494:pharmacology; D002726:Chlorogenic Acid / Q000737:chemistry / Q000494:pharmacology; D002839:Chromans / Q000737:chemistry / Q000494:pharmacology; D003373:Coumaric Acids / Q000737:chemistry / Q000494:pharmacology; D003474:Curcumin / Q000737:chemistry / Q000494:pharmacology; D008027:Light; D015394:Molecular Structure; D010084:Oxidation-Reduction; D010636:Phenols / Q000737:chemistry / Q000494:pharmacology*; D010851:Picrates / Q000378:metabolism; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology*; D011422:Propionates; D011794:Quercetin / Q000737:chemistry / Q000494:pharmacology; D000077185:Resveratrol; D012256:Riboflavin / Q000737:chemistry*; D013267:Stilbenes / Q000737:chemistry / Q000494:pharmacology; D013451:Sulfonic Acids / Q000378:metabolism; D014641:Vanillic Acid / Q000737:chemistry / Q000494:pharmacology
chemical_list: D000975:Antioxidants; D052160:Benzothiazoles; D001713:Biphenyl Compounds; D002109:Caffeic Acids; D002839:Chromans; D003373:Coumaric Acids; D010636:Phenols; D010851:Picrates; D010936:Plant Extracts; D011422:Propionates; D013267:Stilbenes; D013451:Sulfonic Acids; C002502:2,2'-azino-di-(3-ethylbenzothiazoline)-6-sulfonic acid; D002726:Chlorogenic Acid; D011794:Quercetin; C004931:1,1-diphenyl-2-picrylhydrazyl; D014641:Vanillic Acid; C495469:p-coumaric acid; D003474:Curcumin; D000077185:Resveratrol; C010643:6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid; D012256:Riboflavin; C040048:caffeic acid
keywords: antioxidant capacity; phenolic compound; phototransformation; riboflavin