Soluble phenolics and antioxidant properties of soybean (Glycine max L.) cultivars with varying seed coat colours.

Highlights: [•] Isoflavones differed significantly with cultivars, crop years, and seed coat colours. [•] Malonylgenistin and cyanidin-3-O-glucoside had the most remarkable variations. [•] Protein, oil, and fatty acid showed slight variations in coloured seed coat soybeans. [•] The acidified methanol extracts of soybeans exhibited potent antioxidant properties. [•] Antioxidant activities are correlated with isoflavone and anthocyanin contents. [Copyright &y& Elsevier]