Quantification of polyphenolic content and bioactive constituents of some commercial rice varieties in Taiwan

► This study analyzed eleven commercial rice varieties in Taiwan. ► Japonica varieties had higher total polyphenol content (TPC) than Indica varieties. ► TPC in pigmented rice varieties was higher than in non-pigmented rice varieties. ► The major polyphenolic compounds in rice were ferulic acid and p-coumaric acid. ► Ferulic acid was mainly present in rice bran and p-coumaric acid in rice husk.