Abstract
The present study was aimed to find out the chemical constituents of essential oils of cymbopogon species,viz. Cymbopogon martinii var motia, Cymbopogon flexuosus Nees., Cymbopogon winterianus Jowitt., growing in Garhwal region of Uttarakhand, India. The essential oils were obtained by hydro-distillationand subjected to detailed Gas Chromatography-Mass Spectroscopy (GC-MS) analysis in order to determine the variation in their volatile constituents. Twenty seven compounds are ?-pinene, ?-myrcene, Limonene, Cis-b-Ocimene, pCymene ,Terpinolene,6-Methyl hept-5-en-2-one, Citronellal, Linalool, Linalyl acetate, ?-Elemene, ?-Caryophyllene, Citronellyl acetate, Neral, ?– Terpineol, Borneol,Gerainal, ?-Cadinene,Geranyl acetate, Citronellol,Nerol,Geraniol, Caryophyllene oxide,Germacrene—D-4-ol,Elemol, Epi-?-cadinol, ?-Cadinol representing 92.24 to 95.86% of the oil compositions as identified. While comparing the common constituents of three different species of cymbopogon taxa , the remarkable variation in compositions of essential oil was observed and it was in concentration of nearl (0.40;34.9;1.6), gerainal (nil;47.5;0.96) geraniol (82.5;4.5;20.15) , citronellol (T;0.2;12.39) , citronellal (0.1;0.5;36.19) , and linalool (0.8;1.6;0.96) for C.martini, C.flexuosus, C. winterianus respectively
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