title: Determination of Enantiomeric Distribution of Terpenes for Quality Assessment of Australian Tea Tree Oil.
abstract: A number of papers have appeared in recent years proposing the use of enantiomeric ratios of key monoterpenes in Australian tea tree oil (TTO) for detection of adulterated oils. There are however a range of reported values, even from exactly the same suite of authentic oils, and we address here probable reasons for these differences and stress the importance of establishing reference ratios within each laboratory based on oils of known provenance. Any biological variation in the ratio for the key terpene terpinen-4-ol has been demonstrated to be effectively unmeasurable, because the standard deviation on multiple measurements of the same oil is of the same order as that of multiple authentic oils.
authors.affiliation: Central Science Laboratory, University of Tasmania , Churchill Avenue, Sandy Bay, Hobart, Tasmania 7005, Australia.
authors.forename: Noel W
authors.initials: NW
authors.lastname: Davies
authors.affiliation: Australian Tea Tree Industry Association (ATTIA, Limited) , Post Office Box 903, Casino, New South Wales 2470, Australia.
authors.forename: Tony
authors.initials: T
authors.lastname: Larkman
authors.affiliation: Australian Centre for Research on Separation Science, School of Chemistry, Monash University , Wellington Road, Clayton, Victoria 3800, Australia.
authors.forename: Philip J
authors.initials: PJ
authors.lastname: Marriott
authors.affiliation: National Center for Natural Products Research, School of Pharmacy, University of Mississippi , University, Mississippi 38677, United States.
authors.forename: Ikhlas A
authors.initials: IA
authors.lastname: Khan
mesh_terms: D001315:Australia; D058110:Counterfeit Drugs / Q000032:analysis; D008401:Gas Chromatography-Mass Spectrometry / Q000592:standards; D031650:Melaleuca / Q000737:chemistry; D011786:Quality Control; D013237:Stereoisomerism; D020947:Tea Tree Oil / Q000032:analysis* / Q000737:chemistry*; D013729:Terpenes / Q000032:analysis* / Q000737:chemistry*
chemical_list: D058110:Counterfeit Drugs; D013729:Terpenes; D020947:Tea Tree Oil