Analysis of Polyphenolic Content and Antioxidant Activity of Four Dark Skin Grapes

Abstract

The polyphenolic of grape skins, pulps and seeds are potential source of natural antioxidant, which are receiving increased attention. In the present work, the total phenolics content (TPC), total flavonoids content (TFC), total flavanols content (TFAC), total anthocyanins content (TMAC) and antioxidant activity (DPPH, ABTS and FRAP) in different tissues of 4 table grapes cultivated in Chengdu plain, south of China, were investigated. In present study, expect TMAC was not be detected in seeds, and our results showed that seeds were the highest in polyphenolic content and antioxidant activity followed by skins, and then pulp. Besides, 'Fenghou' is richer in polyphenolic content than other three cultivars. Hence, 'Fenghou' extracts possesses higher free radical scavenging ability.

Anthocyanins Absorption of Grapes (Vitis vinifera) on Filter Paper Whatmann No. 41 and Whatmann No. 42 for Identification of Borax

“…Antosianin dapat digunakan pendeteksi adanya senyawa kimia seperti boraks karena boraks bersifat basa dan akan bereaksi jika dicampur dengan antosianin. Berdasarkan hasil penelitian lain menyatakan bahwa kulit anggur berwarna gelap total flavonoid yang dihasilkan berkisar dari 1055,0 -1380,7 mg RE (Rutin Equivalents)/kg FW (Fresh Weight) [12] .…”