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Designing supercritical carbon dioxide extraction of rice bran oil that contain oryzanols using response surface methodology
Author(s) -
Wang ChihHung,
Chen ChaoRui,
Wu JiaJiuan,
Wang LingYa,
Chang ChiehMing J.,
Ho WaiJane
Publication year - 2008
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.200700583
Subject(s) - rice bran oil , supercritical carbon dioxide , extraction (chemistry) , response surface methodology , chemistry , chromatography , bran , central composite design , hexane , carbon dioxide , supercritical fluid , yield (engineering) , materials science , organic chemistry , raw material , metallurgy
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.