title: Antioxidant activity and constituents of propolis collected in various areas of Korea.
abstract: Propolis is a resinous substance collected by honeybees from various plant sources. The composition of propolis depends on time, vegetation, and the area of collection. This study examined the antioxidant activity of propolis from various areas of Korea: Chilgok, Cheongju, Geochang, Muju, Pocheon, and Sangju. Ethanol extracts of propolis (EEP) were prepared and evaluated for their antioxidant activity by beta-carotene bleaching, 1,1-diphenyl-2-picrylhydrazyl free radical scavenging, and 2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) radical cation decolorization assays. Furthermore, the major constituents in EEP were identified by high-performance liquid chromatography analysis with a photodiode array and mass spectrometric detection, and each component was quantitatively analyzed. EEP from Cheongju and Muju had relatively strong antioxidant activity accompanied by high total polyphenol contents. Propolis from Cheongju contained large amounts of antioxidative compounds, such as caffeic acid, kaempferol, and phenethyl caffeate. On the other hand, propolis from Pocheon had compounds not seen in propolis from other areas.
authors.affiliation: Laboratory of Functional Food Science and COE Program in the 21st Century, School of Food and Nutritional Sciences, University of Shizuoka, 52-1 Yada, Shizuoka 422-8526, Japan.
authors.forename: Mok-Ryeon
authors.initials: MR
authors.lastname: Ahn
authors.forename: Shigenori
authors.initials: S
authors.lastname: Kumazawa
authors.forename: Tomoko
authors.initials: T
authors.lastname: Hamasaka
authors.forename: Keuk-Seung
authors.initials: KS
authors.lastname: Bang
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Nakayama
mesh_terms: D000975:Antioxidants / Q000032:analysis*; D052160:Benzothiazoles; D001713:Biphenyl Compounds; D002851:Chromatography, High Pressure Liquid; D000431:Ethanol; D005419:Flavonoids / Q000032:analysis; D016166:Free Radical Scavengers / Q000737:chemistry; D007723:Korea; D019787:Linoleic Acid / Q000737:chemistry; D010084:Oxidation-Reduction; D010636:Phenols / Q000032:analysis; D010851:Picrates / Q000737:chemistry; D010936:Plant Extracts / Q000737:chemistry; D059808:Polyphenols; D011429:Propolis / Q000737:chemistry*; D013451:Sulfonic Acids / Q000737:chemistry
chemical_list: D000975:Antioxidants; D052160:Benzothiazoles; D001713:Biphenyl Compounds; D005419:Flavonoids; D016166:Free Radical Scavengers; D010636:Phenols; D010851:Picrates; D010936:Plant Extracts; D059808:Polyphenols; D013451:Sulfonic Acids; C002502:2,2'-azino-di-(3-ethylbenzothiazoline)-6-sulfonic acid; D000431:Ethanol; D011429:Propolis; D019787:Linoleic Acid; C004931:1,1-diphenyl-2-picrylhydrazyl