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| Effect of solvent on preparation of monoglycerides byenzymatic glycerolysis of soybean oil |
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| DOI： |
| KeyWord:monoglycerides solvent enzyme activity liquid-liquid equilibrium phase diagram |
| FundProject:江苏前瞻性联合研究项目（BY2012091） |
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| Abstract: |
| It is a green and environmental friendly way to synthesize monoglycerides by enzymes.However, the catalytic efficiency is significantly reduced by the low mass transfer rate. The effects of solvent type on the preparation of monoglycerides by enzymatic glycerolysis of soybean oil were studied.The results showed that isopropanol could be used as a suitable solvent for preparing monoglycerides.The solvent ratio was predicted by liquid-liquid equilibrium ternary constant temperature phase diagram,and it was found that the optimal solvent ratio should be lower than 4∶ 1(ratio of isopropanol volume to soybean oil mass). Through actual experiment, 3∶ 1 was selected as the optimal solvent ratio. Under the optimal solvent ratio and reacting for 10 h at 45 ℃, the molar yield of monoglycerides was as high as 6175%, the specific activity of Novozym435 enzyme was relatively stable with the residual enzyme activity about 70% of that before the reaction. |
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