Centaurea karduchorum Boiss. from Eastern Anatolia: Phenolic composition, antioxidant and enzyme inhibitory activities


Dalar A., Uzun Y., Mükemre M., TÜRKER M. , Konczak I.

JOURNAL OF HERBAL MEDICINE, cilt.5, ss.211-216, 2015 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 5 Konu: 4
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1016/j.hermed.2015.09.006
  • Dergi Adı: JOURNAL OF HERBAL MEDICINE
  • Sayfa Sayısı: ss.211-216

Özet

The phenolic composition of lyophilized hydrophilic extracts obtained from root, stem, leaf and flower of Centaurea karduchorum Boiss. a medicinal plant endemic to Eastern Anatolia (Turkey) used as antidiabetic agent was characterized for the first time. Liquid chromatography mass spectrometry (LC/MS) analysis revealed that luteolin derivatives and chlorogenic acid were the dominating compounds contributing, respectively, from 16.1% (root) to 33.7% (stem) and from 7.3% (flower) to 12.0% (root) of total phenolics. Total reducing capacities of the extracts varied from 24.1 (root) to 38.5 (flower) mg gallic acid Eq./g DW [Folin-Ciocalteu assay] and from 274.0 (root) to 441.0 (stem) mu mol Fe2+/g DW [FRAP assay]. The oxygen radical absorbance capacity (ORAC assay) values varied from 930.5 (root) to 1853.5 (stem) mu mol trolox Eq./g DW. The leaf extract exhibited a pronounced inhibitory activity towards alpha-glucosidase (IC50: 0.63 +/- 0.00 mg/ml) and a weak inhibitory activity towards amylase (IC50: 14.63 +/- 0.67 mg/ml), which suggests a potential to reduce postprandial hyperglycaemia and supports its traditional use as antidiabetic agent. (C) 2015 Elsevier GmbH. All rights reserved.