Browsing by Author "Kirimer, Nese"

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Origanum Minutiflorum O. Schwarz Et P. H. Davis Essential Oil: Enzyme Inhibitory Activities and Chemical Composition
(Marmara Univ, 2023) Yildiz, Gulsum; Demirci, Betuel; Temel, Halide Edip; Kirimer, Nese
The essential oil (EO) of Origanum minutiflorum O. Schwarz et P. H. Davis was obtained by the hydrodistillation method. The analysis of the EO was conducted using Gas Chromatography (GC) and Gas Chromatography/Mass Spectrometry (GC/MS). The yield of the EO was determined to be 3.9%. Fifty-six compounds were identified, constituting 97.8% of the EO. The EO was rich in carvacrol at a rate of 83.3%, and the other major compounds were p-cymene (3.0%), beta-caryophyllene (1.3%), trans-sabinene hydrate (1.1%), gamma-terpinene (1.1%), borneol (1.1%), and terpinene-4-ol (1.0%). While the EO (100 mu g/mL) demonstrated the highest inhibition on cyclooxygenase-1 (COX-1) with 55.26%, the inhibitory activities on the other enzymes were as follows: cyclooxygenase-2 (COX-2); 33.10%, and matrix metalloproteinase-9 (MMP-9); 12.87%. The EO had no inhibition on lipoxygenase (LOX). In this research, inhibitory activity of the EO of O. minutiflorum on COXs and MMP-9 enzymes was reported for the first time.
Origanum Minutiflorum: Phytochemical Profile and Inhibitory Effects on Key Enzymes Associated With Inflammation
(Taylor & Francis Ltd, 2023) Yildiz, Gulsum; Temel, Halide E.; Agalar, Hale G.; Kirimer, Nese
Origanum minutiflorum, an endemic species in Turkiye, is used for both food and medicinal purposes. 70% ethanol extract of aerial parts of O. minutiflorum was subjected to liquid-liquid extraction using; n-hexane, dichloromethane, ethyl acetate and n-butanol. The inhibitory activity of these fractions on lipoxygenase (LOX), cyclooxygenase (COX) and matrix metalloproteinase-9 (MMP-9) was investigated at 100 mu g/mL concentration. The LOX enzyme was most effectively inhibited by the dichloromethane fraction (82.33%), whereas the COX-1, COX-2 and MMP-9 enzymes were most effectively inhibited by the ethyl acetate fraction (78.50%, 83.96% and 45.11%, respectively). The ethyl acetate fraction was selected for activity-guided fractionation based on the COX enzymes' inhibitory activities by column chromatography. Only the ethyl acetate sub-fraction-1 showed inhibition on the COX-1 with 65.78%. The COX-2 inhibitory activities of the sub-fractions ranged from 59.96% to 97.62%. The main components were determined by HPLC-MS/MS as jaceidine in the dichloromethane fraction and rosmarinic acid in the ethyl acetate fraction. As far as we know, this study is the first to correlate the anti-inflammatory activity of O. minutiflorum extracts with LOX, COX and MMP-9 enzyme pathways and their secondary metabolites. These data showed that O. minutiflorum may contribute to other studies on natural origin anti-inflammatory agents.