title: [Synthesis and characterization of protocatechuic acid derivants].
abstract: To explore the effects of protocatechuic acid (PCA) and its derivants on angiogenesis of the chick embryo chorioallantoic membrane (CAM) and scavenging DPPH radical in vitro. The protection of benzyl and alkaline hydrolysis of benzyl ester were employed. The structures of PCA-1, PCA-2 and PCA-3, the derivates of PCA, were elucidated by 1H, 13C-NMR and MS data The bioactivity of PCA and its derivants was evaluated on the models of DPPH radical and chick embryo chorioallantoic membrane (CAM), respectively. PCA and PCA-1 showed the best activity of scavenging DPPH radical among all the compounds. In contrast to PCA-2, PCA and PCA-3 displayed inhibition to angiogenesis (P < 0.001). Pyrocatechol hydroxyl is the active site of PCA on scavenging DPPH radical in vitro. PCA with carboxyl and without pyrocatechol hydroxyl seems to show promotion to angiogenesis, but it needs more evidences.
authors.affiliation: Beijing University of Chinese Medicine, Beijing 100102, China.
authors.forename: Qu-Sheng
authors.initials: QS
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Qiu-Jun
authors.initials: QJ
authors.lastname: Han
authors.forename: Peng-Long
authors.initials: PL
authors.lastname: Wang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Li
authors.forename: Hai-Min
authors.initials: HM
authors.lastname: Lei
mesh_terms: D043925:Angiogenesis Inducing Agents / Q000037:antagonists & inhibitors / Q000737:chemistry*; D000818:Animals; D001713:Biphenyl Compounds; D002396:Catechols / Q000737:chemistry; D002642:Chick Embryo; D049033:Chorioallantoic Membrane / Q000187:drug effects*; D004365:Drugs, Chinese Herbal / Q000737:chemistry* / Q000302:isolation & purification; D016166:Free Radical Scavengers / Q000737:chemistry; D062385:Hydroxybenzoates / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D010851:Picrates
chemical_list: D043925:Angiogenesis Inducing Agents; D001713:Biphenyl Compounds; D002396:Catechols; D004365:Drugs, Chinese Herbal; D016166:Free Radical Scavengers; D062385:Hydroxybenzoates; D010851:Picrates; C009091:protocatechuic acid; C004931:1,1-diphenyl-2-picrylhydrazyl; C034221:catechol