title: Simple techniques to increase the production yield and enhance the quality of organic rice bran oils.
abstract: This study develops simple techniques for increasing production yield and refining of crude RBO (CRBO). It was found that pre-heating of rice bran by hot air oven to reach 60°C before being extracted by screw press machine increased the yield from 4.8 to 8.3%w/w. This paper suggested three simple steps for refining of organic CRBO: (1) filtering using filter papers (2) sedimentation by adding 4%w/v fuller's earth and (3) bleaching by running through a packed column of activated carbon. These steps significantly enhanced the qualities of RBO when compared to CRBO before treatment. It was found that the lightness of oil as indicated by color value (L*) increased from 22.8 to 28.7, gum and wax decreased from 3.6 to 1.3%w/w. However, the simple refining method had no effect on peroxide value and free fatty acid content. Moreover, it slightly induced the loss of oryzanol content from 2.8 to 2.2%w/w.
authors.affiliation: Faculty of Food and Agricultural Technology, Pibulsongkram Rajabhat University, Muang, Phitsanulok, Thailand. khongsak@live.psru.ac.th
authors.forename: Khongsak
authors.initials: K
authors.lastname: Srikaeo
authors.forename: Maythawinee
authors.initials: M
authors.lastname: Pradit
mesh_terms: D005591:Chemical Fractionation / Q000295:instrumentation / Q000379:methods*; D019245:Compressive Strength / Q000502:physiology; D004526:Efficiency; D005227:Fatty Acids / Q000032:analysis; D006358:Hot Temperature; D058871:Organic Agriculture; D010666:Phenylpropionates / Q000032:analysis / Q000302:isolation & purification; D010938:Plant Oils / Q000737:chemistry* / Q000378:metabolism*; D011786:Quality Control; D000073879:Rice Bran Oil; D014885:Waxes / Q000032:analysis / Q000302:isolation & purification
chemical_list: D005227:Fatty Acids; D010666:Phenylpropionates; D010938:Plant Oils; D014885:Waxes; D000073879:Rice Bran Oil; C013172:gamma-oryzanol