Nutrients and antioxidant properties of Indonesian underutilized colored rice

Purpose – The paper aims to investigate the iron, zinc, carotenoid, vitamin E, anthocyanin, and phenolic contents, antioxidant activity and the effect of the boiling of rice on such parameters. Design/methodology/approach – Iron and zinc content were investigated using atomic absorption spectrometry. Meanwhile, simultaneous extraction and detection methods using high performance liquid chromatography were applied for carotenoids, tocopherol, and tocotrienol analyses. For anthocyanin and phenolic determination, pH differential method and Folin Ciocalteu method were used, respectively. Antioxidant activity of samples was examined using ferric reducing antioxidant power (FRAP) and superoxide radical scavenging methods. Findings – The n790 cultivar has a higher iron, zinc γ tocopherol (1,869.64 mg/kg), α tocopherol (1,883.97 mg/kg), anthocyanin (205.54 mg cyanidin 3 glucoside equivalent/100 g dry matter), and phenolic (728.9 mg catechin equivalent/100 g dry matter) contents. Jowo cultivar has higher lutein (1...