Effects of Growth Stage and Particle Size on the Physical, Chemical, Structural, and Bioactive Properties of Alkaline-Extracted Dietary Fiber from Rice Husk (Oryza sativa L.)

Rice husk (RH), an underutilized by-product of rice milling, represents a promising source of dietary fiber with health-promoting potential. This study investigated the effects of growth stage and particle size on the chemical composition and functional properties of dietary fiber isolated from green rice husk (G-RH) and ripe rice husk (R-RH). Cellulose contents ranged from 62 to 85 g/100 g DW in G-RH and from 38 to 73 g/100 g DW in R-RH, while β-glucan levels were 66–85 mg/g DW and 67–92 mg/g...