4.4 Article

Comparative study of volatile oil compositions of two Plectranthus species from northern India

Journal

NATURAL PRODUCT RESEARCH
Volume 25, Issue 18, Pages 1727-1732

Publisher

TAYLOR & FRANCIS LTD
DOI: 10.1080/14786419.2010.513975

Keywords

Plectranthus; essential oils; piperitenone oxide; beta-caryophyllene; piperitone; germacrene D

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The leaf and inflorescence essential oils of Plectranthus rugosus Wall. (syn. Rabdosia rugosa Wall.) and Plectranthus incanus L. (syn. Plectranthus mollis L.), which grow wild in Uttarakhand, India, were analysed and compared by capillary gas chromatography and gas chromatography-mass spectrometry. The analysis led to the identification of 43 constituents, forming 89.5-93.6% of the total oil compositions. Both leaf and inflorescence oil of P. rugosus were dominated by sesquiterpene hydrocarbons (71.8%, 71.7%) represented by beta-caryophyllene (36.2%, 29.8%), germacrene D (25.2%, 28.2%) and alpha-humulene (6.6%, 8.6%) as the major constituents. Conversely, the leaf and inflorescence oil of P. incanus were dominated by monoterpenoids (74.4%, 65.8%) with piperitenone oxide (44.2%, 38.5%), piperitone (8.6%, 12.2%) and terpinolene (14.5%, 10.2%) as major constituents. Piperitenone oxide, piperitone, cis- and trans-piperitols and trans-piperitol acetate were the marker constituents in P. incanus, which were not noted in the essential oil of P. rugosus.

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