title: DPPH free-radical scavenging ability, total phenolic content, and chemical composition analysis of forty-five kinds of essential oils.
abstract: Forty-five kinds of commonly used essential oils were employed to investigate the DPPH (1,1-diphenyl-2-picrylhydrazyl) radical scavenging ability and total phenolic content of major chemical compositions. The free-radical scavenging ability and total phenolic content of cinnamon leaf and clove bud essential oils are the best among these essential oils. One-half milliliter of cinnamon leaf and clove bud essential oils (10 mg/ml EtOH) are shown to be 96.74% and 96.12% of the DPPH (2.5 ml, 1.52x10(-4) M) free-radical scavenging ability, respectively. Their EC50 (effective concentrations) are 53 and 36 (microg/ml). One milligram per milliliter of cinnamon leaf, clove bud, and thyme red essential oils were shown to be 420, 480, and 270 (mg/g of GAE) of total phenolic content, respectively. Eugenol in cinnamon leaf and clove bud essential oils (82.87% and 82.32%, respectively) were analyzed by GC-MS. It is clear that the amounts of the phenol compounds in essential oils and the DPPH free-radical scavenging ability are in direct proportion.
authors.affiliation: Department of Science and Technology for Bioindustry, Hungkuang University, Shalu, No. 34, Chung-Chie Road, Taichung, Taiwan 433, ROC.
authors.forename: Hsiao-Fen
authors.initials: HF
authors.lastname: Wang
authors.forename: Yu-Kang
authors.initials: YK
authors.lastname: Wang
authors.forename: Kuang-Hway
authors.initials: KH
authors.lastname: Yih
mesh_terms: D001713:Biphenyl Compounds; D002935:Cinnamomum zeylanicum / Q000737:chemistry; D005054:Eugenol / Q000032:analysis / Q000737:chemistry; D016166:Free Radical Scavengers / Q000032:analysis / Q000737:chemistry* / Q000494:pharmacology; D008401:Gas Chromatography-Mass Spectrometry; D009822:Oils, Volatile / Q000032:analysis / Q000737:chemistry* / Q000494:pharmacology; D010636:Phenols / Q000032:analysis; D010851:Picrates / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry
chemical_list: D001713:Biphenyl Compounds; D016166:Free Radical Scavengers; D009822:Oils, Volatile; D010636:Phenols; D010851:Picrates; D005054:Eugenol; C004931:1,1-diphenyl-2-picrylhydrazyl