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Rice bran stabilization and rice bran oil extraction using ohmic heating
N Rao Lakkakula1, Marybeth Lima, Terry Walker
1Department of Biological and Agricultural Engineering, Room 149, E.B. Doran Building, Louisiana State University AgCenter, Baton Rouge, LA 70803-4505, USA.
Bioresource Technology
|December 25, 2003
Summary
Ohmic heating effectively stabilizes rice bran and significantly boosts rice bran oil extraction. This method shows a non-thermal effect on lipase activity, enhancing lipid recovery.
Area of Science:
- Agricultural Science
- Food Science
- Biotechnology
Background:
- Rice bran, a byproduct of rice milling, contains valuable rice bran oil.
- Traditional methods for rice bran processing have limitations.
- Ohmic heating is explored as a novel stabilization and extraction technique.
Purpose of the Study:
- To stabilize rice bran using ohmic heating.
- To improve rice bran oil extraction yield compared to other methods.
- To investigate the effects of ohmic heating parameters on extraction efficiency.
Main Methods:
- Ohmic heating was applied to rice bran with moisture addition.
- Extraction yields were compared against microwave heating and a control group.
- Lipase activity and lipid extraction percentages were measured.
Main Results:
- Ohmic heating effectively stabilized rice bran.
- A maximum of 92% of total lipids was extracted using ohmic heating, compared to 53% for the control.
- Electricity demonstrated a non-thermal effect on lipase activity, slowing free fatty acid increase.
Conclusions:
- Ohmic heating is a viable method for rice bran stabilization and enhancing rice bran oil extraction.
- Lowering AC frequency may further improve oil extraction efficiency, potentially via electroporation.
- This technique has significant implications for extracting non-polar compounds from high-oil-content materials.