Free and bound total phenolic concentrations, antioxidant capacities, and profiles of proanthocyanidins and anthocyanins in whole grain rice (Oryza sativa L.) of different bran colours

► Higher concentration of phenolics and antioxidant capacity in dark colour bran rice. ► Approx. 50% of total phenolics in light-coloured bran rice were the insoluble, bound form. ► Anthocyanins and proanthocyanidins found in purple and red bran rice, respectively. ► Cyanidin-3-glucoside was predominant anthocyanins in purple bran rice. ► Proanthocyanindins: 6.5%, 33.5%, 30.6% and 29.4% of 1-3, 4-6, 7-10 mers, and polymer.