Volume: 42 Issue: 2
Chiral differentiation of terpenoids in bergamot mint (Mentha citrata) cultivar Kiran: A non-menthol mint essential oil
Year: 2020, Page: 138-144, Doi: https://doi.org/10.62029/jmaps.v42i2.VS
Received: Dec. 10, 2019 Accepted: March 20, 2020 Published: July 1, 2020
Mentha citrata, popularly known as bergamot mint,is one of the mint species which does not possess menthol, a terpenoid chemical constituent that gives the name Mentha to the genus. CSIR-CIMAP has developed a cultivar cv. Kiran by induced mutagenesis. Gas chromatographic (GC) analysis of the essential oil of this cultivar shows linalool (44.9 %) and linalyl acetate (28.7%) as the major constituents. Further, the enantioselective GC analysis of the essential oil to determine the enantiomeric ratio of linalool and linalyl acetate indicate that (R)-(-)-linalool is in 78.8% excess over its enantiomer, whereas (R)-(-)-linalyl acetate is present as a single enantiomer. Other chiral terpenoids resolved in the enantioselective GC analysis are (1S)-(-)-ß-pinene as the major exclusive enantiomer with 93.0% enantiomeric excess and (-)-sabinene with 60.2% enantiomeric excess than its enantiomers. The significance of enantiomer separation and enantiomeric excess of chiral terpenoids in the essential oil of M. citrata cv. Kiran is of great importance in ascertaining the authenticity of this essential oil.
Keywords: Enantiomeric excess, Enantioselective GC, Linalool, Linalyl acetate, Mentha citrate
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Pragadheesh VS, Anju Yadav, Chandan S Chanotiya. 2020. Chiral differentiation of terpenoids in bergamot mint (Mentha citrata) cultivar Kiran: A non-menthol mint essential oil. J Med Aromat Plant Sci 42: 138-144.
