Extraction of RBO has been performed using conventional
techniques like solvent extraction and mechanical pressing. But
solvent extraction (hexane) is more commonly used in the RBO
industry. These techniques usually use organic solvents which are
expensive and sometimes toxic. Solvent oil extraction is the most
efficient method; however, its application presents some industrial
disadvantages such as plant security problems, emissions of volatile
organic compounds into the atmosphere, high operation costs
and poor quality products caused by high processing temperatures
(Uquiche et al., 2008). In our previous work, we studied on yield
and chemical properties of solvent extracted and cold-pressed RBO
(O. saltiva L.) Rice bran sample were stabilized by hot air heating
(hot air oven) at 150 C for 10 min prior to extraction with hexane
and pressing. We found that solvent extraction had higher the
extraction yield of oil than that of cold pressing method. But coldpressed
RBO had lower values in acid, peroxide and free fatty acid
but higher iodine number than that of solvent extracted RBO.
Therefore, the cold-pressed extraction process gave a better crude
oil quality and contained higher vitamin, phytochemical and
mineral content than that of solvent extraction.