Extracted Lipids and Carbohydrates During Washing and Boiling of Milled Rice

Washing and cooking of waxy and nonwaxy milled rice and rice flour resulted in extraction of lipids, and carbohydrates, principally starch and nonstarch polysaccharides. Lipids, nonstarch polysaccharides and amylose contributed to hardening of waxy rice (IR 29) starch gel consistency in H₂O. Lipids extracted were mainly nonstarch lipids, principally free fatty acids. Nonstarch polysaccharides extracted in cold water were rich in glucose, galactose and arabinose, but those extracted in hot water were mainly glucans. Hot water extractable starch was more in waxy than in nonwaxy rice but complexed less with IR 29 amylopectin.