Optimisation of The Dielectric Barrier Discharge To Produce Riceberry Rice Flour Retained With High Activities Of Bioactive Compounds Using Plasma Technology

Abstract

Riceberry rice is a hybrid rice that contains polyphenol compounds, anthocyanin, and high antioxidants. Plasma technology has been used to improve the quality of rice and rice flour. Some conditions of the plasma process can be altered to get the combination that can achieve maximum result. The present work aimed to identify the optimal combination of a plasma treatment condition by varying three variables: time (3-10 min), power (140-180 W), and oxygen flow rate (0.0-0.8 L/min) in improving the nutrient and antioxidant agent of Riceberry rice flour. The increase in time and power significantly increased the percenatge of the scavenging ability of the free radical 2,2-diphenyl-1-picrylhydrazyl (DPPH), peonidin 3-glucoside, cyanidin 3-glucoside, and total anthocyanin; while the decrease in oxygen significantly decreased all the parameters analysed. The optimal plasma conditions were 7.87 min, 166 W, and 0.64 L/min of oxygen flow rate. Under this condition, the Riceberry rice flour consisted of 65.05% scavenging ability of DPPH, peonidin 3-glucoside of 45.21 mg/100 g, cyanidin 3-glucoside of 179.6 mg/100 g, and total anthocyanin of 225.81 mg/100 g. Finally, the plasma technique can improve the antioxidant activity and anthocyanin of Riceberry rice flour.