Effect of Geographical Climatic Conditions on Yield, Chemical Composition and Carbon Isotope Composition of Nagarmotha (Cyperus scariosus R. Br.) Essential Oil
2016
Anil Kumar, | Niranjan, Abhishek | Lehri, Alok | Srivastava, Ramesh K. | Tewari, SK
Nagarmotha (Cyperus scariosus) rhizomes collected from 13 locations in India were characterized for oil content using hydro-distillation method. The distilled oil was subjected for estimation of its chemical composition using GC-MS. The oil yield analysed by using hydro-distillation varied from 0.20% Padampur (Orissa) to 0.58% Tilakgram (M.P.). The Gas chromatography-Mass Spectrometry (GC-MS) analyses of the 13 hydro-distilled oils showed considerable differences in their chemical composition. The major compounds present in essential oil of nagarmotha rhizomes were identified as cyperene, longifolin, caryophylline oxide and longiverbenone. The amount of cyperene varied from 5.77% (Tilakgram M.P.) to 24.17% (Raipur, Chhattisgarh), longifolin varied from 5.95% (Raipur, Chhattisgarh) to 20.43% (Panna, M.P.), caryophyllene oxide ranged from 2.42% (Padampur, Orissa) to 10.38% (Tilakgram M.P.) and longiverbenone ranged from 3.96% (Padampur, Orissa) to 12.71% (Badarpur, Orissa). All the nagarmotha rhizomes and oils were also characterized for their carbon isotope composition using Isotopic Ratio Mass Spectrometry (IRMS). The carbon isotope ratio of the oils varied from -11.15 (Ujjain MP) to –15.78 (Sitapur UP) per mil. Similar values of carbon isotope composition were obtained by estimation directly in the nagarmotha rhizome.
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