title: Antityrosinase and antioxidant effects of ent-kaurane diterpenes from leaves of Broussonetia papyrifera.
abstract: Three new ent-kaurane type diterpenes, broussonetones A-C (1-3), were isolated from leaves of Broussonetia papyrifera, together with seven known compounds, and their structures determined by 1D and 2D NMR and MS methods. Compounds 1-3 were marginal inhibitors of tyrosinase. Antioxidant assays showed them also to be inhibitors of xanthine oxidase. The mild inhibition of tyrosinase and significant inhibition of xanthine oxidase suggests that 1-3 could be useful ingredients in the development of skin-protecting cosmetics.
authors.affiliation: Department of Fragrance and Cosmetic Science, Kaohsiung Medical University, Kaohsiung 807, Taiwan, Republic of China. hhko@cc.kmu.edu.tw
authors.forename: Horng-Huey
authors.initials: HH
authors.lastname: Ko
authors.forename: Wen-Ling
authors.initials: WL
authors.lastname: Chang
authors.forename: Tzy-Ming
authors.initials: TM
authors.lastname: Lu
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D001713:Biphenyl Compounds / Q000494:pharmacology; D031623:Broussonetia / Q000737:chemistry*; D045786:Diterpenes, Kaurane / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D004354:Drug Screening Assays, Antitumor; D015394:Molecular Structure; D014442:Monophenol Monooxygenase / Q000037:antagonists & inhibitors*; D010851:Picrates / Q000494:pharmacology; D018515:Plant Leaves / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D013624:Taiwan; D014969:Xanthine Oxidase / Q000037:antagonists & inhibitors
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D000975:Antioxidants; D001713:Biphenyl Compounds; D045786:Diterpenes, Kaurane; D010851:Picrates; C568000:broussonetone A; C568001:broussonetone B; C568002:broussonetone C; C004931:1,1-diphenyl-2-picrylhydrazyl; D014442:Monophenol Monooxygenase; D014969:Xanthine Oxidase