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BİTİŞ, LEYLA

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    Chemical composition of endemic Stachys subnuda Montbret & Aucher ex Benth. essential oil and its anti-inflammatory and antioxidant activities
    (TAYLOR & FRANCIS INC, 2019) DOĞAN, AHMET; Sen, Ali; Kurkcuoglu, Mine; Bitis, Leyla; Dogan, Ahmet; Baser, Kemal Husnu Can
    The essential oil of aerial parts of Stachys subnuda Montbret & Aucher ex Benth (S. subnuda) was analyzed by gas chromatography (GC) and GC/mass spectrometry (MS). Anti-inflammatory activity was evaluated by lipoxygenase inhibition assay. The antioxidant activity was determined by 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2'-azinobis-3-ethylbenzothiozoline-6-sulfonic acid (ABTS) assays. Sixty-two constituents, comprising 97.1% of the total essential oil composition, were identified. Phytol (25.2%), beta-caryophyllene (11.2%), germacrene D (6.9%), and hexadecanoic acid (6.9%) were the major compounds of aerial part essential oils of S. subnuda. The essential oil showed significant radical scavenging activity with 50% inhibition (IC50) values of 0.124 and 0.204 mg/mL for ABTS and DPPH radicals, respectively. The essential oil exhibited moderate anti-inflammatory activity with an IC50 value of 0.419 mg/mL. The results indicated that S. subnuda essential oil had good anti-inflammatory and antioxidant activity. Also, this is first study on chemical composition, anti-inflammatory and antioxidant activity of S. subnuda essential oil.
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    Chemical composition, antiradical, and enzyme inhibitory potential of essential oil obtained from aerial part of Centaurea pterocaula Trautv
    (TAYLOR & FRANCIS INC, 2021) ŞEN, ALİ; Sen, Ali; Kurkcuoglu, Mine; Yildirim, Aybeniz; Senkardes, Ismail; Bitis, Leyla; Baser, Kemal Husnu Can
    The chemical composition, free radical scavenging, alpha-amylase inhibitory, and 5-lipoxygenase inhibitory activity of the essential oil obtained from the aerial parts of Centaurea pterocaula Trautv. were examined. Twenty-nine compounds corresponding to 93.2% of the oil were identified in the oil of C. pterocaula. Hexadecanoic acid (13.9%), caryophyllene oxide (11.5%), spathulenol (11.4%), (E)-beta-damascenone (5.0%), hexahydrofarnesyl acetone (5.0%), and tetradecanoic acid (4.9%) were the main compounds of the oil. The oil exhibited good anti-inflammatory activity, inhibiting 5-lipoxygenase with an IC50 value of 86.22 mu g/mL. The oil was found to be active against DPPH radical and alpha-amylase with IC50 values of 83.05 and 79.66 mu g/mL respectively, while it showed moderate activity against ABTS radicals with IC50 value of 360.9 mu g/mL. To the best of our knowledge, this is first report on the chemical composition of C. pterocaula essential oil from Turkey; as well as on the biological activity of its essential oil.