3. Results
3.1. Chemical composition of Omani basil oil
The yield of the hydrodistilled basil oil during cropping season of
late summer was found to be 1.2 mL i.e. 0.6% v/w on fresh weight basis which was greater than the previously reported value by
Hanif et al.[5]. It has been reported that yield of basil oil may vary
considerably from 0.07% to 1.92% in various basil accessions[17].
The content and composition of Omani basil oil identified by GC–MS
analysis are presented in Table 1. A total of 38 phytochemicals were detected but only 36 chemical
constituents were identified (99.87%). The number of identified
components in this study was small as compared with the previous
study in which a total of 75 compounds were identified representing
99.8% of Omani basil oil[5]. Linalool was identified as the major
component (69.87%), followed by geraniol (9.75%), p–allylanisole
(6.02%), 1,8–cineole (4.90%), trans–琢–bergamotene (2.36%) and
neryl acetate (1.24%).
Although there was a difference in number and concentration of the basil oil constituents in both studies, linalool (69.87%) was identified
as the major component with almost similar concentration present
in Omani basil oil in both studies. In our study, the concentration
of p–allylanisole was found to be approximately ten times of the
value observed in Omani basil oil by Hanif et al[5]. This difference
could be due to seasonal variation and stage of plant growth. Two
compounds with retention time of 13.40 min (0.074%) and 31.38
min (0.045%) could not be identified by GC–MS analysis.
The basil volatile oil primarily consisted of oxygenated monoterpenes,
monoterpene hydrocarbons, sesquiterpene hydrocarbons, oxygenated
sesquiterpenes and diterpene hydrocarbon.
3. Results3.1. Chemical composition of Omani basil oilThe yield of the hydrodistilled basil oil during cropping season oflate summer was found to be 1.2 mL i.e. 0.6% v/w on fresh weight basis which was greater than the previously reported value byHanif et al.[5]. It has been reported that yield of basil oil may varyconsiderably from 0.07% to 1.92% in various basil accessions[17].The content and composition of Omani basil oil identified by GC–MSanalysis are presented in Table 1. A total of 38 phytochemicals were detected but only 36 chemicalconstituents were identified (99.87%). The number of identifiedcomponents in this study was small as compared with the previousstudy in which a total of 75 compounds were identified representing99.8% of Omani basil oil[5]. Linalool was identified as the majorcomponent (69.87%), followed by geraniol (9.75%), p–allylanisole(6.02%), 1,8–cineole (4.90%), trans–琢–bergamotene (2.36%) andneryl acetate (1.24%).Although there was a difference in number and concentration of the basil oil constituents in both studies, linalool (69.87%) was identifiedas the major component with almost similar concentration presentin Omani basil oil in both studies. In our study, the concentrationof p–allylanisole was found to be approximately ten times of thevalue observed in Omani basil oil by Hanif et al[5]. This differencecould be due to seasonal variation and stage of plant growth. Twocompounds with retention time of 13.40 min (0.074%) and 31.38min (0.045%) could not be identified by GC–MS analysis.The basil volatile oil primarily consisted of oxygenated monoterpenes,monoterpene hydrocarbons, sesquiterpene hydrocarbons, oxygenatedsesquiterpenes and diterpene hydrocarbon.
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