Comparisons of phaseolin type and α-amylase inhibitor in common bean (Phaseolus vulgaris L.) in China

The objective of this study was to characterize the phaseolin type and α-amylase (αAI) level in common bean (Phaseolus vulgaris L.) accessions deposited in the Chinese National Genebank. The 40 accessions sampled were common varieties originating in Asia, North America, South America, Europe, and Africa. No Inca (I-) phaseolin was observed in the accessions. Only four accessions contained Tendergreen (T-) phaseolin and the remaining 36 contained Sanilac (S-) phaseolin. αAI proteins extracted from nine accessions showed higher α-amylase inhibitory activity than the control (Phase 2, IC50 = 0.65 μg). These common bean accessions have potential use as nutraceutical ingredients.