Optimization of Supercritical Fluid Extraction for the Recovery of γ-Oryzanol-Rich Extracts with Improved Bioactivity from Rice Bran

Rice bran, a humble by-product of rice milling, hides a treasure trove of bioactive compounds—and supercritical CO2 just might be the key to unlocking its full potential.

Rice bran is often discarded, yet it's packed with γ-oryzanol and fatty acids that boast antioxidant and anti-inflammatory powers. Scientists are now using supercritical fluid extraction—a green technology that uses pressurized CO2—to efficiently recover these valuable compounds. By tweaking temperature and pressure, they found the sweet spot at 62°C and 500 bar, yielding 17.3% extract with high concentrations of fatty acids (784.5 mg/g) and γ-oryzanol (36.6 mg/g). Compared to traditional hexane extraction, this method matched the overall yield but doubled the γ-oryzanol content, showing superior selectivity. The extracts also proved their mettle in lab tests: they reduced reactive oxygen species by up to 50% in stressed intestinal cells, and the supercritical extract was more effective at inhibiting colorectal cancer cell growth than both hexane extract and pure γ-oryzanol. This research paves the way for turning agricultural waste into health-boosting ingredients.

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