| Anthocyanin, total polyphenol content and antioxidant activities of fifty-one Thai rice cultivars were investigated. The antioxidant activities were evaluated using three different assays; ferric reducing antioxidant power (FRAP), 2,2-azino-bis-(3-ethylbenzothi azoline-6-sulphonic acid) diammonium salt (ABTS) radical cation and oxygen radical absorbance capacity (ORAC) assays. The total polyphenol content (TPC) and anthocyanin content varied significantly and ranged from 0.194-8.702 and 0.001– 6.676 mg/g (dry wt), respectively. The extracts from pigmented rice exhibited higher TPC, anthocyanin content and antioxidant activities than did the non-pigmented varieties. Among them, glutinous dark rice (GDR) had the highest levels of TPC and anthocyanin content... |
