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Olennikov, Daniil N; Chirikova, Nadezhda K; Kashchenko, Nina I; Nikolaev, Vyacheslav M; Kim, Sang-Woo; Vennos, Cecile
Frontiers in pharmacology, 07/2018, Letnik: 9Journal Article
genus of Asteraceae family is a source of medicinal plants known worldwide and used as ethnopharmacological remedies for the treatment of diabetes in Northern Asia (Siberia). The aim of this study was to determine the phenolic profile of 12 Siberian species ( ) and to test the efficacy of plant extracts and pure compounds for antidiabetic potential. Finally, by HPLC-DAD-ESI-TQ-MS/MS technique, 112 individual phenolic compounds were detected in extracts in a wide range of concentrations. Some species accumulated rare plant phenolics, such as coumarin-hemiterpene ethers (lacarol derivatives) from and ; melilotoside from ; dihydrochalcones (davidigenin analogs) from ; chrysoeriol glucosides from , and ; eriodictyol glycosides from ; and some uncommon flavones and flavonols. The predominant phenolic group from species herb was caffeoylquinic acid (CQAs), and in all species, the major CQAs were 5- -CQA (20.28-127.99 μg/g) and 3,5-di- -CQA (7.35-243.61 μg/g). In a series of bioassays, all studied extracts showed inhibitory activity against principal enzymes of carbohydrate metabolism, such as α-amylase (IC = 150.24-384.14 μg/mL) and α-glucosidase (IC = 214.42-754.12 μg/mL). Although many phenolic compounds can be inhibitors, experimental evidence suggests that the CQAs were key to the biological response of extracts. Mono-, di- and tri-substituted CQAs were assayed and showed inhibition of α-amylase and α-glucosidase, with IC values of 40.57-172.47 μM and 61.08-1240.35 μM, respectively, and they were more effective than acarbose, a well-known enzyme inhibitor. The results obtained in this study reveal that Siberian species and CQAs possess a pronounced inhibitory activity against α-amylase and α-glucosidase and could become a complement to synthetic antidiabetic drugs for controlling blood glucose level.
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