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    Antioxidant and Enzyme Inhibitory Activities of Extracts from Wild Mushroom Species from Turkey
    (BEGELL HOUSE INC, 2017) Zengin, Gökhan; Üren, Mehmet Cemil; Koçak, Mehmet Sefa; Güngör, Halil; Locatelli, Marcello; Aktümsek, Abdurrahman; Sarıkürkcü, Cengiz
    The antioxidant and inhibitory effects of methanol and aqueous extracts from Hymenogaster aromaticus, Ramaria aurea, and Rhizopogon luteolus against cholinesterase, tyrosinase, alpha-amylase, and a-glucosidase are reported here, to our knowledge for the first time. Antioxidant activities were investigated using different assays, including 2,2-diphenyl-1-picrylhydrazyl, 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid), ferric ion-reducing antioxidant power, cupric ion-reducing antioxidant capacity, phosphomolybdenum, and metal-chelating assays. In general, the highest antioxidant and enzyme-inhibitory effects were observed in methanol extracts, which had the highest concentrations of phenolics. (+)-Catechin, benzoic acid, and p-hydroxybenzoic acid were determined to be the main phenolics in H. aromaticus components both in methanol and in aqueous extracts, whereas the other 2 species present very different phenolic fingerprints, also at smaller quantities. These results suggest that these mushroom species may be considered sources of natural agents.
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    Phenolic content, antioxidant and enzyme inhibitory capacity of two Trametes species
    (ROYAL SOC CHEMISTRY, 2016) Zengin, Gökhan; Karanfil, Abdullah; Üren, Mehmet Cemil; Koçak, Mehmet Sefa; Sarıkürkcü, Cengiz; Güngör, Halil; Picot, Carene Marie Nancy
    The phenolic composition, antioxidant and enzyme inhibitory activities of methanolic and water extracts of Trametes gibbosa (TG) and Trametes hirsuta (TH) were characterised for the first time. Reversed-phase high-performance liquid chromatography (RP-HPLC) analysis revealed that TG and TH methanolic extracts contained (+)-catechin, chlorogenic acid and caffeic acid. Methanolic extracts of TG and TH showed significantly (p < 0.05) high inhibition rates on acetyl (1.87 and 1.60 mg galantamine equivalents (GALAEs) per g extract respectively) and butyryl cholinesterase (1.71 and 1.90 mg GALAEs per g extract respectively). Low and insignificant inhibition was observed against alpha-amylase. alpha-Glucosidase inhibitory activity of TG (0.93 mmol acarbose equivalents (ACEs) per g extract) and TH (1.18 mmol ACEs per g extract) methanolic extracts were significantly (p < 0.05) high. Methanolic extract of TG (16.85 +/- 0.29 TEs per g extract) and TH (13.86 +/- 0.03 mg TEs per g extract) showed the most effective cupric reducing power. This study tends to support the potential use of these mushrooms species for designing new functional food formulations.