title: Antimicrobial and antioxidant activities of the root bark essential oil of Periploca sepium and its main component 2-hydroxy-4-methoxybenzaldehyde.
abstract: The root bark essential oil of Periploca sepium Bunge (Asclepiadaceae/ Apocynaceae) obtained by hydrodistillation was investigated by GC and GC-MS. 2-Hydroxy-4-methoxybenzaldehyde was found to be the main component (78.8% of the total) among 17 identified compounds. 2-Hydroxy-4-methoxybenzaldehyde was separated and purified by preparative thin layer chromatography, and was further identified by means of physicochemical and spectrometric analysis. Both the essential oil and 2-hydroxy-4-methoxybenzaldehyde exhibited antimicrobial activities on all test bacteria and fungi, with MBC/MFC values ranging from 125 microg/mL to 300 microg/mL, MIC values from 80 microg/mL to 300 microg/mL, and IC(50) values from 63.29 microg/mL to 167.30 microg/mL. They also showed moderate antioxidant activity in the DPPH free radical scavenging, beta-carotene bleaching and ferrozine-ferrous ions assays. The results indicated that the major portion of these antimicrobial and antioxidant activities was due to the presence of 2-hydroxy-4-methoxy-benzaldehyde in the oil, which could potentially be developed as an antimicrobial and antioxidant agent in the future.
authors.affiliation: College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China.
authors.forename: Jihua
authors.initials: J
authors.lastname: Wang
authors.forename: Hao
authors.initials: H
authors.lastname: Liu
authors.forename: Jianglin
authors.initials: J
authors.lastname: Zhao
authors.forename: Haifeng
authors.initials: H
authors.lastname: Gao
authors.forename: Ligang
authors.initials: L
authors.lastname: Zhou
authors.forename: Zhilong
authors.initials: Z
authors.lastname: Liu
authors.forename: Yuanquan
authors.initials: Y
authors.lastname: Chen
authors.forename: Peng
authors.initials: P
authors.lastname: Sui
mesh_terms: D000890:Anti-Infective Agents / Q000494:pharmacology*; D000975:Antioxidants / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects; D001547:Benzaldehydes / Q000737:chemistry / Q000494:pharmacology*; D005658:Fungi / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D009822:Oils, Volatile / Q000494:pharmacology*; D031109:Periploca / Q000737:chemistry*; D024301:Plant Bark / Q000737:chemistry*; D018517:Plant Roots / Q000737:chemistry*
chemical_list: D000890:Anti-Infective Agents; D000975:Antioxidants; D001547:Benzaldehydes; D009822:Oils, Volatile; C118297:2-hydroxy-4-methoxybenzaldehyde