Ionic liquids as a reaction medium for lipase-catalyzed methanolysis of sunflower oil |
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Authors: | S Sunitha S Kanjilal P S Reddy R B N Prasad |
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Institution: | (1) Lipid Science and Technology Division, Indian Institute of Chemical Technology, Uppal Road, Hyderabad, 500 007, India |
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Abstract: | Ionic liquids, 1-butyl-3-methyl imidazolium hexafluorophosphate (BMIm]PF6]) and 1-ethyl-3-methyl imidazolium hexafluorophosphate (EMIm]PF6]), were used for the methanolysis of sunflower oil using Candida antarctica lipase (Novozyme 435) and gave yields of fatty acid methyl esters at 98–99% within 10 h. The optimum conditions of methanolysis
in hydrophobic ionic liquids are 2% (w/w) lipase, 1:1 (w/w) oil/ionic liquid and 1:8 (mol/mol) oil/methanol at 58–60°C. Methanolysis
using hydrophilic ionic liquids, 3-methyl imidazolium tetrafluoroborate (HMIm]BF4]) and 1-butyl-3-methyl imidazolium tetrafluoroborate (BMIm]BF4]), gave very poor yields. A hydrophobic ionic liquid thus protects the lipase from methanol. Recovered ionic liquids and
lipase were used for four successive reaction cycles without any significant loss of activity. |
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Keywords: | Fatty acid methyl ester Ionic liquid Lipase Methanolysis Sunflower oil |
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