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KMID : 1024420110150020175
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Food Engineering Progress
2011 Volume.15 No. 2 p.175 ~ p.181
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Extraction of Surface-Active Substances from Defatted Rice Bran by Supercritical Carbon Dioxide
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Lee Hyong-Ju
Lee Eui-Seok
Hong Soon-Tack
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Abstract
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By using supercritical carbon dioxide fluid, an attempt was made to extract surface-active substances from defatted rice bran. Extraction was carried out according to D-optimal design and results were analyzed by response surface methodology to establish optimum condition. It was found that pressure, temperature and co-solvent (ethanol) influenced in a different extent on the extraction efficiency (i.e., yield and interfacial tension) of surface-active substances. Among them, co-solvent was found to be a major influencing factor, where maximum yield (2.62%) was observed at the highest content (250 g). In addition, it also affected most on the interfacial tension at the oil-water interface but in this case the lowest interfacial tension value (9.51 mN/m) was found when added lowest (50 g). In conclusion, it was estimated that the optimum extraction condition was to be pressure 350bar, temperature 62oC and co-solvent content 50 g in this study, where extraction yield was 0.69% and interfacial tension to be 10.1 mN/m.
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KEYWORD
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rice bran, supercritical carbon dioxide extraction, surface-active substances, interfacial tension
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