JOURNAL 758


Records of Natural Products
VOLUME & ISSUE
Year: 2014 Issue: 4 October-December
PAGES
p.360 - 372
STATISTICS
Viewed 1263 times.
AUTHORS
    Mei Wang, Amar G. Chittiboyina, Cristina Avonto, Jon F. Parcher and Ikhlas A. Khan
PDF OF ARTICLE

GRAPHICAL ABSTRACT


ABSTRACT


 Commercial geranium oil samples, steam-distilled oils of authenticated plant samples, and a reference sample were investigated by GC/MS to determine the validity and applicability of a series of chemical and stereochemical tests that have been proposed in the literature to identify the country of origin, phytochemical identity or authenticity of geranium oils. The chemical tests evaluated include the ratio of the concentrations of geraniol to citronellol and the presence or absence of certain sesquiterpenes, viz., (-)- guaia-6,9-diene and (-)-10-epi-γ-eudesmol. The stereochemical tests include the stereochemical distribution of i) citronellol, ii) menthone and isomenthone, and iii) rose oxides. The most reliable chemical test was the presence or absence of the sesquiterpene probes. The stereochemical tests proved to be less reliable. Most of the tests could be used to classify geranium oils into general types; however, none of the tests provided a foolproof method to distinguish cultivars or country of origin. During this study, the ambiguity in the absolute stereochemistry of (-)-10-epi-γ-eudesmol and (-)-guaia-6,9-diene was addressed, and these two sesquiterpenes could serve as effective markers for the authentication of P. graveolens essential oils.

KEYWORDS
  • Geranium oil
  • sesquiterpenes
  • chemical and stereochemical tests
  • Pelargonium graveolens
  • chiral GC/MS. © 2014 ACG Publications. All rights reserved.

SUPPORTING INFORMATION


Supporting Information
Download File 51-RNP-EO_1309-064_SI.pdf (678.97 KB)