Effect of Germination on y-Oryzanol Content of Selected Sarawak Rice Cultivars

Problem statement: Rice is rich in complex carbohydrates and beneficial bioactive compounds such as y-Aminobutyric Acid (GABA), y-oryzanol and vitamin. Several bioactive components are known to accumulate in rice during germination process. This study was to investigate the effect of germination process on y-oryzanol levels in selected Sarawak local rice cultivars. Approach: Rice seeds were germinated for 4, 8, 12, 16, 18, 20 or 24 h at 25°C and samples were processed and analyzed for y-oryzanol content. A partial extraction method was used for quantitative y-oryzanol analysis. Results: Result showed y-oryzanol concentrations in the rice cultivars varied from 0.099-0.340 mg g-1 on dry weight basis. Cultivars Udang Halus and Silah showed the highest concentration of y-oryzanol after 16 h germination. Conclusion: The germination process exhibited diverse effects on the y-oryzanol accumulation in rice and it was cultivar dependent.