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Simultaneous deacidification and dewaxing of high acid value rice bran oil
  
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KeyWord:high acid value rice bran oil  deacidification and dewaxing  nutrient
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ZOU Man College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China
 
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Abstract:
      With 95% ethanol as extractant, the free fatty acid and wax in high acid value rice bran oil were removed simultaneously by solvent method. Using single factor experiment and orthogonal experiment, the process conditions for simultaneous deacidification and dewaxing of high acid value rice bran oil were optimized with the deacidification rate and dewaxing rate as indicators. The results showed that the optimal process conditions were obtained as follows: dosage of lecithin 0.15%(based on 95% ethanol mass), extraction time 40 min, extraction temperature 60 ℃, ratio of material to liquid 1∶ 2.5, and the extraction times 4. Under the optimal conditions, the deacidification rate, dewaxing rate of rice bran oil and refining yield were 99.45%, 99.86% and 65.67% respectively, and the retention rates of oryzanol, phytosterols and vitamin E were 87.88%, 97.64% and 95.15% respectively.
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