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After the extraction, the crude rice bran oil is often refined in order to improve its quality and commercial value. The fundamental steps of the refining process include dewaxing, degumming, neutralization of the free fatty acids, bleaching, and steam deodorization.
What is rice bran used for?
This by-product represents around 9% of all milled rice, and it is full of nutritional and bioactive compounds, but despite these positive proprieties, it is usually wasted or used for animal feeds. Rice bran is particularly rich in oil, which is generally extracted by means of mechanical pressing or organic solvent extraction.
What is rice bran wax used for?
Some industrial manufacturers also used it for oil recovery. However, the recovered oil was utilized for nonedible applications. In addition, a few researchers ( Prasad et al., 2008, Prasad et al., 2009) developed a process for the upgradation and bleaching of crude rice bran wax.
Why is parboiled rice bran a good choice for dewaxing?
It was observed that oils obtained from parboiled rice bran have much easier operation compared to raw bran. The temperature of the place also has an influence on dewaxing parameters. Another important factor is the moisture content of the oil.
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.
What are the pretreatment steps of rice bran oil?
7. Degumming of Rice Bran Oil The most important pretreatment step is the degumming of crude oil. Oil degumming is carried out to remove undesired phospholipids, metal ions, and other impurities from oil.