title: Designing supercritical carbon dioxide extraction of rice bran oil that contain oryzanols using response surface methodology.
abstract: This study examines the supercritical carbon dioxide (SC-CO(2)) extraction of oryzanols contained rice bran oil from powdered rice bran. The extraction efficiencies and concentration factors of oryzanols, free fatty acids and triglycerides in the SC-CO(2) extracts were determined. With top-flow type SC-CO(2) extraction the total oil yield was 18.1% and the extraction efficiencies of oryzanols and triglycerides were 88.5 and 91.3% respectively, when 2750 g CO(2 )was consumed during the extraction of 35 g rice bran powder. The concentration factors of oryzanols and triglycerides in SC-CO(2)-extracted oil were higher than in the Soxhlet n-hexane extracted oil. SC-CO(2) extractions indicated that pressure can be used more effectively than temperature to enhance the extraction efficiency and concentration factor of oryzanols. A two-factor central composite scheme of response surface methodology was employed to determine the optimal pressure (300 bar) and temperature (313 K) for increasing the concentration of oryzanols in the SC-CO(2) extracted oil.
authors.affiliation: Department of Chemical Engineering, National Chung Hsing University, Taichung, Taiwan, Republic of China.
authors.forename: Chih-Hung
authors.initials: CH
authors.lastname: Wang
authors.forename: Chao-Rui
authors.initials: CR
authors.lastname: Chen
authors.forename: Jia-Jiuan
authors.initials: JJ
authors.lastname: Wu
authors.forename: Ling-Ya
authors.initials: LY
authors.lastname: Wang
authors.forename: Chieh-Ming J
authors.initials: CM
authors.lastname: Chang
authors.forename: Wai-Jane
authors.initials: WJ
authors.lastname: Ho
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D002851:Chromatography, High Pressure Liquid; D025924:Chromatography, Supercritical Fluid / Q000379:methods*; D004867:Equipment Design; D005230:Fatty Acids, Nonesterified / Q000737:chemistry; D006586:Hexanes / Q000737:chemistry; D008956:Models, Chemical; D009821:Oils / Q000737:chemistry; D010938:Plant Oils / Q000032:analysis*; D011312:Pressure; D000073879:Rice Bran Oil; D012997:Solvents / Q000737:chemistry; D013696:Temperature; D014280:Triglycerides / Q000737:chemistry
chemical_list: D005230:Fatty Acids, Nonesterified; D006586:Hexanes; D009821:Oils; D010938:Plant Oils; D012997:Solvents; D014280:Triglycerides; D002245:Carbon Dioxide; C026385:n-hexane; D000073879:Rice Bran Oil