Free Fatty Acid (FFA) in rice bran is a critical quality metric indicating oil degradation, with raw bran often reaching 41.84% FFA within 75 days, while high-quality raw bran typically stays below 4%. High lipase activity causes rapid hydrolytic rancidity, necessitating stabilization (e.g., extrusion, steaming) to inhibit FFA increase.

Key Details About Rice Bran FFA:

• Raw vs. Stabilized: Raw rice bran rapidly increases in FFA, often making it unsuitable for edible oil refining if not stabilized promptly.
• Storage Conditions: Vacuum packaging can sometimes lead to higher FFA levels in stored raw bran compared to non-vacuum packaging, though stabilization methods like extrusion are more effective at limiting lipase activity.
• Quality Indicators: High-quality raw rice bran has FFA levels below 4%, whereas poor-quality or aged bran can have FFA exceeding 10%.
• Oil Extraction Impact: High FFA in bran complicates the refining process for edible oil, usually reducing the yield of refined rice bran oil.