Bioactive compounds and antioxidant activities of red (brown red jasmine) and black (Kam Leum Pua) native pigmented rice
2016
Chaiwut, P. | Pradmeeteekul, P. | Pintathong, P. | Thitipramote, N. | Nimkamnerd, J. | Thitilerdecha, N.
Bioactive compounds (total phenolic, anthocyanin and proanthocyanidin contents) and their antioxidant activities (DPPH, ABTS radical scavenging and ferric reducing antioxidant power assays; FRAP) of red (Brown Red Jasmine rice: BRJ), black (Kam Leum Pua rice: KLP) and white rice (Japanese Brown rice: JBR) were investigated. These rice were extracted by 70% ethanol as solvent for 6 hours at room temperature. Results showed that BRJ red rice extract composed of the significant higher total phenolic content (1.018 mg GAE/mg extract) than those of KLP black and JBR white rice (0.755 and 0.069 mg GAE/mg extract, respectively) (p<0.05). The proanthocyanidin compound was only found in BRJ red rice extract (3.168 mg CE/mg extract) whereas the anthocyanidin was only occurred in extract of KLP black rice (17.784 mg/ml extract). Moreover, the antioxidant activities from these 3 assays (DPPH, ABTS, FRAP) tended to be higher activities in BRJ red rice (7.528, 84.476, 10.792 mg TE/mg extract) than those of KLP black rice (7.227, 79.347, 8.727 mg TE/mg extract) and JBR white rice (0.537, 18.199, 0.640 mg TE/mg extract) (p<0.05). These results suggested that the native Thai pigmented rice, especially red BRJ rice, had the high bioactive compound with high antioxidant capacity. Its extract may be applied as active ingredient in cosmetic, food and other industries.
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