Evaluation of Antioxidant Activity, Total Flavonoids, Tannins and Phenolic Compounds in Psychotria Leaf Extracts
作者： Anelise Formagio , Carla Volobuff , Matheus Santiago , Claudia Cardoso , Maria Vieira
关键词: Flavonols 、 Organic chemistry 、 Hydroxycinnamic acid 、 Proanthocyanidin 、 Food science 、 Psychotria carthagenensis 、 Chemistry 、 ABTS 、 p-Coumaric acid 、 DPPH 、 Flavonoid
摘要: The antioxidant activity of Psychotria carthagenensis, P. leiocarpa, capillacea and deflexa (Rubiaceae) extracts were investigated, the concentrations total phenolics, flavonoids, condensed tannins flavonols determined. chemical compositions investigated using high performance liquid chromatography (HPLC/PAD) method. We used 1,1-diphenyl-1-picrylhydrazyl free radical (DPPH), β-Carotene bleaching 2,2-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) cations to determine activity. ability scavenge was measured in these experiments by discoloration solution. Concentrations constituents spectrophotometrically. carthagenensis exhibited highest activity, DPPH test, β-carotene ABTS system. phenolic, flavonoid, tannin flavonol concentration found extracts. HPLC-PDA analysis revealed hydroxycinnamic acid (p-coumaric acid). This is first report on properties constituent
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