title: Comparative analysis of volatile components from Clematis species growing in China.
abstract: The volatile components between stems and roots and also among five Clematis species from China were studied and analyzed by gas chromatography-mass spectrometry (GC-MS) combined with alternative moving window factor analysis (AMWFA), a new chemometric resolution method. Identification of the compounds was also assisted by comparison of temperature-programmed retention indices (PTRIs) on HP-5MS with authentic samples included in our own laboratory database under construction. A total of 153 different compounds accounting for 86.6-96.5% were identified and significant qualitative and quantitative differences were observed among the samples. The major volatile components in different essential oils from Clematis species were n-hexadecanoic acid and (Z,Z)-9,12-octadecadienoic acid. Our work further demonstrated chemometric resolution techniques upon the two-dimensional data and PTRIs can provide a complementary and convenient method for fast and accurate analysis of complex essential oils.
authors.affiliation: Research Center of Modernization of Chinese Herbal Medicine, College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, PR China.
authors.forename: Ying-Xu
authors.initials: YX
authors.lastname: Zeng
authors.forename: Chen-Xi
authors.initials: CX
authors.lastname: Zhao
authors.forename: Yi-Zeng
authors.initials: YZ
authors.lastname: Liang
authors.forename: Hong
authors.initials: H
authors.lastname: Yang
authors.forename: Hong-Zhuang
authors.initials: HZ
authors.lastname: Fang
authors.forename: Lun-Zhao
authors.initials: LZ
authors.lastname: Yi
authors.forename: Zhong-Da
authors.initials: ZD
authors.lastname: Zeng
mesh_terms: D039324:Clematis / Q000737:chemistry*; D004365:Drugs, Chinese Herbal / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D019787:Linoleic Acid / Q000032:analysis; D009822:Oils, Volatile / Q000032:analysis; D019308:Palmitic Acid / Q000032:analysis; D010938:Plant Oils / Q000032:analysis*
chemical_list: D004365:Drugs, Chinese Herbal; D009822:Oils, Volatile; D010938:Plant Oils; D019308:Palmitic Acid; D019787:Linoleic Acid