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| Selective enrichment of monoglycerides in ionic liquids bylipase-catalyzed esterification |
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| KeyWord:ionic liquid monoglycerides selective enrichment lipase solvent property polarity |
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| Abstract: |
| The lipase-catalyzed esterification was studied in ionic liquids(ILs) in order to deduce the effects of solvent properties on selective enrichment of monoglycerides (MAG). The results showed that polarity and Kamlet-Taft parameters of ILs were the decisive factors for selective enrichment of MAG. Especially for [Tf2N\]-based ILs, ETN values had a significantly positive correlation with MAG selectivity. ILs with higher polarity and hydroxyl group could form the hydrogen-bond with MAG and resulted in higher MAG selectivity such as [HO(CH2)2MIM]Tf2N and [BMIM]N(CN)2. ILs with higher log P and lowerβ, such as [Tf2N]-/sup> and [PF6]-based ILs, resulted in higher fatty acid (FFA) conversion. Viscosity might reduce the reaction rate, which could decrease the FFA conversion and increase MAG selectivity in some high viscous ILs especially for [PF6]- based ILs, and it appeared contrary to the law of polarity. Choosing [HO(CH-)-MIM]Tf-N as the solvent, the optimal preparation conditions of MAG were obtained as follows: reaction time 8 h, reaction temperature 50?℃，substrate(glycerol and oleic acid) molar ratio 4∶1，lipase dosage 4%，ILs dosage 30%. Under the optimal conditions, FFA conversion, MAG content and MAG selectivity were 93.6%, 61.1% and 64.5% repectively. |
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