title: Terpenoid compositions and antioxidant activities of two Indian valerian oils from the Khasi Hills of north-east India.
abstract: The volatile constituents of Valeriana jatamansi Jones and V. hardwickii Wall. (Valerianaceae) collected from the Khasi Hills of north-east India were analyzed by GC and GC/MS. Twenty-seven and twenty-one compounds were characterized and identified from V. jatamansi and V. hardwickii samples, representing 90.6% and 82.7% of the total oil, respectively. Sesquiterpenes were shown to be the main constituents in both the oil samples. Maaliol (26.1%), patchouli alcohol (9.3%) and a-gurjunene (8.7%) were the major components of V. jatamansi oil, whereas valeracetate (21.3%), methyl linoleate (14.1%), bornyl acetate (13.8%) and cuparene (7.1%) were the main constituents of V. hardwickii oil. Both Indian valerian essential oils were studied for their antioxidant activities using the free radical-scavanging activity (DPPH) and ferric reducing antioxidant power (FRAP) assays. V. hardwickii oil exhibited a higher antioxidant capacity than V. jatamansi in both assays. For both the valerian oil samples, there was a concentration-dependent increase in free radical scavenging activity and ferric reducing capacity. Both valerian oils and their ingredients are potential sources of natural antioxidants.
authors.affiliation: Department of Biotechnology, Gauhati University, Guwahati-781 084, India.
authors.forename: Jayashankar
authors.initials: J
authors.lastname: Das
authors.forename: Ashiho A
authors.initials: AA
authors.lastname: Mao
authors.forename: Pratap J
authors.initials: PJ
authors.lastname: Handique
mesh_terms: D000975:Antioxidants / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D007194:India; D009822:Oils, Volatile / Q000032:analysis*; D013729:Terpenes / Q000032:analysis*; D014632:Valerian / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D009822:Oils, Volatile; D013729:Terpenes