Optimization of Oil Extraction from Rice Bran with Mixed Solvent Using Response Surface Methodology

Area of Science:

• Agricultural Chemistry
• Food Science and Technology
• Chemical Engineering

Background:

• Rice bran oil (RBO) extraction efficiency is crucial for maximizing yield and economic value.
• Traditional solvents may have limitations in extraction efficiency and oil quality.
• Developing novel extraction methods is essential for the food and agricultural industries.

Purpose of the Study:

• To optimize extraction conditions for a new mixed solvent for rice bran oil.
• To evaluate the efficiency and quality of RBO extracted using the novel mixed solvent.
• To provide data supporting the industrial application of new mixed solvent systems.

Main Methods:

• Single-factor experiments and response surface methodology (RSM) with a central composite design were employed.
• Key parameters investigated included solid-liquid ratio, extraction time, temperature, and oscillation speed.
• Analysis of RBO quality parameters such as peroxide value, acid value, iodine value, and fatty acid composition.

Main Results:

• Optimal extraction conditions determined: 5.5:1 solid-liquid ratio, 45 °C, 12 min extraction time, yielding 85.8% RBO.
• Extracted RBO exhibited quality parameters comparable to n-hexane and superior to solvent No. 6.
• Significant increases in oryzanol (2.7%) and total sterol (5.1%) content were observed.

Conclusions:

• The new mixed solvent offers a highly efficient method for rice bran oil extraction.
• The optimized process yields high-quality RBO with enhanced beneficial compounds.
• This research provides a viable alternative for industrial RBO production, improving yield and nutritional value.