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- W2895653246 abstract "Inula helenium L. (Asteraceae) lipophilic root extracts were previously reported to contain antiproliferative eudesmane (alantolactone derivatives), germacrane and elemane-type sesquiterpene lactones [1]. Additionally, according to a previous report, the essential oil of I . helenium roots contained predominantly alantolactone (52.4%), and isoalantolactone (33.0%), while the oil displayed fungistatic and bacteriostatic properties [2]. In the current study, the essential oil composition of the aerial parts of I . helenium subsp. turcoracemosa collected in Trabzon was determined. The essential oil was obtained by hydrodistillation (3 h) using a Clevenger apparatus. The essential-oil yield was below 0.01% ( v/w ). The essential oil was trapped in n- hexane and dried over anhydrous Na 2 SO 4 . The essential oil was analyzed by GC-MS without further dilution. The essential oil was analyzed with an Agilent 5977 MSD GC-MS system operating in EI mode; injector and MS transfer line temperatures were set at 250 °C. Splitless injection was used in the analysis. Innowax FSC column (60 m x 0.25 mm, 0.25 µm film thickness) and helium as the carrier gas (1 mL/min) were used in GC-MS analyses. The oven temperature program was: 60 °C for 10 min and then raised to 220 °C at a rate of 4 °C/min, afterward the temperature was kept constant at 220 °C for 10 min and then raised to 240 °C at a rate of 1 °C/min. Mass spectra were recorded at 70 eV with the mass range m/z 35-425. Relative amounts of the separated compounds were calculated from the integration of the peaks in MS chromatograms. Identification of essential-oil components was carried out by comparison of their retention indices (RI), relative to a series of n -alkanes (C 5 to C 30 ), with the literature values, as well as by mass spectral comparison. Ninety-one compounds were identified representing 82.4% of the detected oil constituents. The main components of the oil were caryophyllene oxide (14.7%), eudesma-5,11(13)-dien-8,12-olide (alantolactone, 6.7%), isoalantalactone (3.8%), and aromadendrene oxide (3.3%). The aerial parts oil of I . helenium subsp. turcoracemosa also contained high amounts of eudesmane sesquiterpenes in accordance with the previous reports on I . helenium root essential oil. Our results indicate that eudesmanolides are also present in the aerial parts essential oil." @default.
- W2895653246 created "2018-10-12" @default.
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- W2895653246 date "2018-10-04" @default.
- W2895653246 modified "2023-09-23" @default.
- W2895653246 title "The essential-oil composition of Inula helenium L. subsp. turcoracemosa Grierson from Turkey" @default.
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