title: GC-MS analysis of the antioxidant active fractions of Micromeria juliana with anticholinesterase activity.
abstract: The aerial parts of Micromeria juliana (L.) Bentham ex Reichb. were extracted with light petroleum, acetone and methanol, successively. The antioxidant activity of different concentrations of the extracts was evaluated using different antioxidant tests, namely total antioxidant (lipid peroxidation inhibition activity), DPPH (1,1-diphenyl-2-picrylhydrazyl) radical scavenging, ferric reducing power, and metal chelating. Total antioxidant activity was determined using the beta-carotene-linoleic acid assay. Unexpectedly, the light petroleum extract exhibited strong lipid peroxidation inhibition activity. The extract was fractionated on a silica gel column and the antioxidant activity of the fractions was determined by the beta-carotene-linoleic assay at 25 microg/mL concentration. The fractions that exhibited more than 50% inhibition activity were analysed by GC and GC/MS; thus, the structure of fourteen compounds were elucidated. In addition, acetyl- and butyryl-cholinesterase inhibitory activities of the extracts were also determined in vitro. The light petroleum and acetone extracts were found to have mild butyrylcholinesterase inhibitory activity.
authors.affiliation: Mugla University, Faculty of Arts and Sciences, Department of Chemistry, 48121 Mugla, Turkey. omehmet@mu.edu.tr
authors.forename: Mehmet
authors.initials: M
authors.lastname: Oztürk
authors.forename: Ufuk
authors.initials: U
authors.lastname: Kolak
authors.forename: Mehmet Emin
authors.initials: ME
authors.lastname: Duru
authors.forename: Mansur
authors.initials: M
authors.lastname: Harmandar
mesh_terms: D000110:Acetylcholinesterase / Q000378:metabolism; D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D001713:Biphenyl Compounds / Q000378:metabolism; D002614:Chelating Agents / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D002800:Cholinesterase Inhibitors / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D005296:Ferrous Compounds / Q000378:metabolism; D008401:Gas Chromatography-Mass Spectrometry; D019686:Lamiaceae / Q000737:chemistry*; D010851:Picrates / Q000378:metabolism; D035261:Plant Components, Aerial / Q000737:chemistry; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology*; D019207:beta Carotene / Q000378:metabolism
chemical_list: D000975:Antioxidants; D001713:Biphenyl Compounds; D002614:Chelating Agents; D002800:Cholinesterase Inhibitors; D005296:Ferrous Compounds; D010851:Picrates; D010936:Plant Extracts; D019207:beta Carotene; C004931:1,1-diphenyl-2-picrylhydrazyl; D000110:Acetylcholinesterase; C029451:ferrous chloride