| Summary: | Proanthocyanidins (PAs) are natural plant antioxidants, whose radical scavenging activities (RSA) degrade harmful free radicals. In the current study, PA contents were analyzed in 52 soybean [Glycine max (L) Merril] landraces having different seed coat colors. PA was extracted by HCl-Butanol method; RSA was determined by 2, 2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging method and quantified using spectrophotometer. Soybean cultivar KaiFengKuoZhuangqingDou had the highest PA content, 946 ABS.ml g-1, followed by Peking, 860 ABS.ml g-1. Both the cultivars had black seed coats. Chasengoku 81Go had the highest PA content (485 ABS.ml g-1) among the landraces with brown seed coat color. In landraces with green seed coats, PA content ranged from 1 to 6 ABS.ml g-1. In landraces with yellow seed coats PA content ranged from 0 to 10 ABS.ml g-1. The RSA was directly proportional to PA content with a high correlation coefficient (r2 = 0.9724), so PA content contributed highly to RSA. Reasons for these wide variations in PA content and RSA within the same colored landraces are discussed.
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