title: Anthocyanin-rich purple potato flake extract has antioxidant capacity and improves antioxidant potential in rats.
abstract: Anthocyanins from various vegetables and fruits have antioxidant activities, however, the bioactivities of coloured potato anthocyanins are not well studied. We examined the antioxidant capacities of pigmented fractions from purple potato flakes in vitro, and the antioxidant potentials of purple potato flakes in vivo. 1,1-Diphenyl-2-picrylhydrazyl radical scavenging activity of the pigmented fraction from Hokkai no. 92 (H92) potato flakes was higher than that from Kitamurasaki (KM) potato flakes. Extracts equivalent to 600 microg pigmented fractions from KM and H92 potato flakes inhibited linoleic acid oxidation in the order trolox>H92> or =KM>control. Rats were fed 25% KM or H92 potato flake diets for 4 weeks. The major anthocyanin was identified as petanin. Control rats were fed a diet with cornstarch instead of potato flakes for 4 weeks. The serum antioxidant potential level in the H92 group was significantly higher than that in the control group. The degree of hepatic lipid peroxidation in the H92 group was significantly lower than that in the control group. Hepatic Cu/Zn-superoxide dismutase (SOD), Mn-SOD and glutathione peroxidase (GSH-Px) mRNA levels in the H92 group were significantly higher than those in the control group. Similar significant differences in Cu/Zn-SOD and Mn-SOD mRNA levels between the KM and control groups were found. The present results suggest that purple potato flakes have antioxidant functions with regard to radical scavenging activity and inhibition of linoleic acid oxidation, and that they improve the antioxidant potentials in rats by enhancing hepatic Mn-SOD, Cu/Zn-SOD and GSH-Px mRNA expression.
authors.affiliation: Department of Agriculture and Life Science, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080, Japan.
authors.forename: Kyu-Ho
authors.initials: KH
authors.lastname: Han
authors.forename: Mitsuo
authors.initials: M
authors.lastname: Sekikawa
authors.forename: Ken-ichiro
authors.initials: K
authors.lastname: Shimada
authors.forename: Makoto
authors.initials: M
authors.lastname: Hashimoto
authors.forename: Naoto
authors.initials: N
authors.lastname: Hashimoto
authors.forename: Takahiro
authors.initials: T
authors.lastname: Noda
authors.forename: Hisashi
authors.initials: H
authors.lastname: Tanaka
authors.forename: Michihiro
authors.initials: M
authors.lastname: Fukushima
mesh_terms: D000818:Animals; D000872:Anthocyanins / Q000494:pharmacology*; D000975:Antioxidants / Q000494:pharmacology*; D015139:Blotting, Southern / Q000379:methods; D016166:Free Radical Scavengers / Q000378:metabolism; D019787:Linoleic Acid / Q000378:metabolism; D008099:Liver / Q000378:metabolism; D008297:Male; D010084:Oxidation-Reduction; D010860:Pigments, Biological; D010936:Plant Extracts / Q000494:pharmacology; D051381:Rats; D011916:Rats, Inbred F344; D020133:Reverse Transcriptase Polymerase Chain Reaction; D011198:Solanum tuberosum; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism
chemical_list: D000872:Anthocyanins; D000975:Antioxidants; D016166:Free Radical Scavengers; D010860:Pigments, Biological; D010936:Plant Extracts; D017392:Thiobarbituric Acid Reactive Substances; D019787:Linoleic Acid