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DİKPINAR, TUĞÇE

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2018 - 201912020 - 20221
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Author: DİKPINAR, TUĞÇE × Subject: antioxidant ×

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    Characterization of the Biological Activity and Phenolics in Achillea lycaonica
    (TAYLOR & FRANCIS INC, 2018) RAYAMAN, ERKAN; Taskin, Turgut; Taskin, Duygu; Rayaman, Erkan; Dikpinar, Tugce; Suzgec-Selcuk, Sevda; Arabaci, Turan
    The purpose of this study was to comparatively evaluate for the first time the antioxidant, antimicrobial, and antiurease effects of A. lycaonica extracts obtained using three extraction methods and five solvents followed by identification of the phenolic compounds obtained by Soxhlet extraction with ethyl acetate and maceration with chloroform that showed the highest total phenolic and flavonoid contents with antioxidant and antiurease activity. The phenolic compounds were identified to be chlorogenic acid, caffeic acid, rutin, dicaffeoylquinic acid, salicylic acid, luteolin, quercetin, naringenin, apigenin, and 8-hydroxy- salvigenin. Among the solvent extraction procedures, Soxhlet approach was found to have higher recoveries than other approaches. The results of 2, 2-diphenyl-1-picrylhydrazyl (DPPH) assays showed that the 1: 1 ethanol-water Soxhlet, ethanol ultrasonic bath, and ethyl acetate Soxhlet extraction methods had the highest DPPH antioxidant activities. The ethyl acetate Soxhlet extraction method showed the highest 2, 2'-azino-bis(3-ethylbenzthiazoline- 6-sulfonic acid) diammonium salt (ABTS) and ferric reducing antioxidant power (FRAP) antioxidant activity. In addition, the chloroform maceration extraction method exhibited the highest antiurease activity. Therefore, 1: 1 Soxhlet ethanol-water, ultrasonic bath ethanol, and Soxhlet ethyl acetate extracts may be used in medicine and food production as natural antioxidant sources. In addition, maceration with chloroform may provide a potential antiurease agent.
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    PublicationOpen Access
    LC-MS/MS analysis and biological activities of endemic Achillea sieheana Stapf from Türkiye
    (2022-01-01) DİKPINAR, TUĞÇE; BİTİŞ, LEYLA; DİKPINAR T., GÖGER F., BİTİŞ L.
    © 2022 Marmara University Press.In this study, in vitro ABTS, DPPH, 5-lipoxygenase, and α-glucosidase inhibitory activities of n-hexane (ASH), dichloromethane (ASD), ethyl acetate (ASE), and methanol (ASM) extracts from the aerial parts of endemic A. sieheana were assayed for the first time. The phytochemical content of ASE, the most active extract, has been first determined by LC-MS/MS. Also, the total amount of phenolic compounds of extracts were calculated. ASE demonstrated significant antioxidant activity with IC50 values of 0.096 and 0.156 mg/mL for ABTS and DPPH, respectively. ASD and ASE with IC50 values of 0.045 and 0.089 mg/mL exhibited significant anti-inflammatory activity. ASE showed moderate α-glucosidase inhibitory activity with an IC50 value of 0.774 mg/mL. Also, the total phenolic content was found to be highest in the ASE. Feruloylquinic acid, luteolin, luteolin glucoside, isorhamnetin, isovitexin, methoxyflavonoid like chrysoeriol and its glycoside derivative in the ASE were detected by LC-MS/MS. The results demonstrated that ASE had significant anti-inflammatory, antioxidant and moderate α-glucosidase inhibitory potential.