Abstract
Effects of cultivated area on antioxidant compounds and antioxidant activities of sorghum were determined. The cultivated areas were Miryang (plain area of interior), Wonju (mountainous territory), and Sinan (coastal area), and the cultivated varieties were Hwanggeumchal-susu (HGCS), Daepung-susu (DPS), Whinchal-susu (WCS), Tojong-susu (TJS), and Mae-susu (MS). The highest total polyphenol contents of methanolic extracts were 19.64 and 19.32 mg gallic acid equivalent (GE)/g in un-hulled MS and DPS on the cultivated Wonju. The highest total flavonoid content was 7.54 mg catechin equivalent (CE)/g in un-hulled DPS on cultivated Wonju. Generally, antioxidant compound contents of sorghum on cultivated Wonju were higher than those of Miryang and Sinan. Further, un-hulled HGCS, DPS, and MS were higher than un-hulled WCS and TJS. The DPPH and ABTS radical scavenging activities of the methanolic extracts of sorghum did not significantly change with the cultivated areas, whereas there were significant changes with cultivated varieties. The radical scavenging activities of un-hulled HGCS, DPS, and MS with red or dark brown seed coats were higher than those of un-hulled WCS and TJS with white seed coats.
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