Rice bran oil (RBO) is obtained through extraction of rice bran which is a by-product of the rice milling industries. There are several techniques used for the extraction of the RBO, but solvent extraction using hexane is the most popular used conventional method for commercial extraction.
Is rice bran a food waste?
Rice bran is a food waste widely produced all over the world. Rice bran can be valorized through green extraction techniques to produce oil. Ultrasound-assisted extraction reduces the rice bran oil extraction time. The ultrasounds permit to lower the environmental impacts of the oil extraction.
How is RBO extracted from rice bran?
The Japanese were the first to extract RBO from rice bran using the hydraulic press technique, which is still used nowadays, but recently, the preferred industrial technique for commercial uses is extraction using non-polar solvents, such as hexane [ 6 ].
Can -oryzanol be extracted from rice bran oil?
All the here reported green extraction techniques allow a high-quality rice bran oil and high concentrations of γ-oryzanol to be obtained and show comparable yields with the extraction methods that employ hexane.