Chemical Composition and TLC-DPPH-Radical Scavenging Activity of Cyperus alternifolius Rottb. Essential Oils

摘要

The essential oils (EOs) of the tubers and aerial parts of Cyperus alternifolius Rottb. were separately extracted and analyzed by gas chromatography-mass spectroscopy (GC-MS). Seventeen and fi fteen volatile compounds were identified from the tubers and aerial parts represented 99.16 % and 100 % of the total mass, respectively. Terpenes (97.82 % and 97.43 %) were the more characteristic content including sesquiterpenes (97.22 % and 3.89 %) and monoterpenes (0.6 % and 93.54 %), respectively. Caryophyllene (50.6 %), caryophyllene oxide (29.84 %), farnesyl acetone (4.65 %) represented the major components of the tubers EO. While D-limonene (63.78 %), theaspirane A (13.36 %), theaspirane B (10.97 %) andy-terpinene (3.4 %) were the majors of aerial partsEO. The aerial parts oil showed significant antioxidant activity at all concentrations in relation to rutin by TLC-DPPH radical scavenging activity method. The EO of the tubers exhibited moderate antioxidant activity at 5 Ug/ml and 10 p-g/ml with values1.33±0.13 and 1.12±0.38, respectively. Significant antioxidant activity were exhibited by aerial parts EO at the three concentrations 2.5 ug/ml, 5 jig/ml and 10 pig/ ml with activity values 5.83±0.61, 7.18±0.81 and 8.48±1.30, respectively.