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Molecules 2017, 22(1), 5; doi:10.3390/molecules22010005

Antioxidant Activities and Chemical Constituents of Flavonoids from the Flower of Paeonia ostii

Chemical Engineering & Pharmaceutical College, Henan University of Science and Technology, Luoyang 471023, Henan, China
These authors contributed equally to this work.
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Academic Editors: Arturo San Feliciano and Celestino Santos-Buelga
Received: 10 September 2016 / Revised: 14 December 2016 / Accepted: 16 December 2016 / Published: 23 December 2016
(This article belongs to the Special Issue Flavonoids: From Structure to Health Issues)
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Abstract

Paeonia ostii is a traditional medicinal plant popularly used in China. This study intended to evaluate the antioxidant properties and the chemical components of the flavonoid-rich extracts from the flowers of P. ostii. The results showed that the flavonoid-rich extracts from the flowers of P. ostii had strong scavenging capacities on 2,2′-Azinobis-(3-ethylbenzthiazoline-6-sulphonate) (ABTS), hydroxyls, superoxide anions, and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals in a dose-dependent manner. Five flavonoids, dihydrokaempferol (1), apigenin-7-O-β-d-glucoside (2), apigenin-7-O-β-d-neohesperidoside (3), kaempferol-7-O-β-d-glucopyranoside (4), and kaempferol-3-O-β-d-glucopyranosyl-7-O-β-d-glucopyranoside (5), were isolated from the flavonoid-rich extracts of the flowers of P. ostii. High-performance liquid chromatography (HPLC) analysis revealed that compounds 3 and 4 were abundant in the P. ostii flower and in flavonoid-rich extracts. The main components of the flower of P. ostii are flavonoids. The high antioxidant activity of the flavonoid-rich extracts may be attributed to the high content of flavonoids. The five isolated flavonoids were the primary antioxidant ingredients, and may play important roles in the strong antioxidant activities of this flower. Based on the obtained results, the flower of P. ostii could be a potential source of natural antioxidants in food and pharmaceutical applications. View Full-Text
Keywords: flavonoids of peony flower; Paeonia ostii; natural antioxidant; chemical constituents flavonoids of peony flower; Paeonia ostii; natural antioxidant; chemical constituents
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MDPI and ACS Style

Zhang, H.; Li, X.; Wu, K.; Wang, M.; Liu, P.; Wang, X.; Deng, R. Antioxidant Activities and Chemical Constituents of Flavonoids from the Flower of Paeonia ostii. Molecules 2017, 22, 5.

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