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In this work, the seeds and pulp extracts of red and white grapes cultivated in Thailand had determined. The phenolic contents (total phenolic, flavonoid, proanthocyanidin and total saponin contents) were strongly positively correlated with the antioxidant activities which analyzed by different method (DPPH and ABTS radical-scavenging, FRAP and CUPRAC). The red grape seeds (RGS) showed the highest activity and polyphenol content among the sample types. According to the RP-HPLC analysis, the RGS had the highest catechin, epicatechin, myricetin, gallic acid, caffeic acid and ferulic acid levels. The obtained results confirmed that Thai grapes are a good source of phytochemicals and grape extracts should be developed as health supplement products.

Phytochemical and Antioxidant Activity in Seeds and Pulp of Grape Cultivated in Thailand