Comparative study on the antioxidant activities of extracts of Coreopsis tinctoria flowering tops from Kunlun Mountains, Xinjiang, north-western China. Issue 4 (16th February 2016)

• Record Type: Journal Article
• Authors: Yao, Xincheng; Gu, Chengzhi; Tian, Liping; Wang, Xinbing; Tang, Hui
• Is Part Of: Natural product research. Volume 30:Issue 4(2016)
• Page Start: 429
• Page End: 432
• Publication Date: 2016-02-16
• Subjects: antioxidant activity -- Coreopsis tinctoria Nutt -- radical scavenging activity; Natural products -- Periodicals; Natural products -- Research -- Periodicals; Biological Factors -- Periodicals; Biological Products -- Periodicals; 547
• DOI: 10.1080/14786419.2015.1015019
• Languages: English
• ISSNs: 1478-6419

Abstract

Abstract : Coreopsis tinctoria flowering tops (CTFs) from the Kunlun Mountains in Xinjing (north-western China) have been used for tea production for about a century. This study aims to assess the antioxidant activities and total phenolic, flavonoid and proanthocyanidin contents of various solvent extracts of CTF. CTF was extracted using n -hexane, chloroform, ethyl acetate, n -butanol, 75% aqueous ethanol (AEE) and water. The antioxidant activities of the CTF extracts were investigated through DPPH, ABTS, * OH, * O2 − , total antioxidant capacity and reducing power assays. The results showed that n -butanol extract showed the highest contents of total phenols and flavonoids, with DPPH, ABTS and * OH radical-scavenging activities with IC50 values of 134, 90.72 and 13.8 μg mL − 1, respectively. The AEE demonstrated the strongest DPPH and ABTS radical-scavenging activities, with IC50 values of 103 and 75.16 μg mL − 1, respectively. Given its high antioxidant effect, CTF is a good source of natural antioxidants or functional food materials. Abstract :