Abstract
The lipase selective hydrolysis of Naproxen methyl ester was explored in both water-saturated isooctane and water-saturated ionic liquid 1-butyl-3-methylimidazolium hexafluoro-phoshate ([bmim]PF6) to see any significant differences in terms of enantioselectivity and stability between two different classes of reaction media. It is shown that polar and hydrophobic of [bmim]PF6 made it an unearthly reaction medium for hydrolysis of Naproxen methyl ester. It not only decreases the equilibrium constant (K) and enhances the enantiomeric ratio (E), consequently improves the equilibrium conversion (CEq) of the hydrolysis reaction and enantiomeric excess of product (eep), but also maintains the lipase activity. Because the lipase would not dissolve in the 1-butyl-3-methylimidazolium hexafluoro-phoshate, it can be filtrated up from 1-butyl-3-methylimidazolium hexafluoro-phoshate and recycled for several runs. The stability of lipase was improved due to the higher solubility of methanol in 1-butyl-3-methylimidazolium hexafluoro-phoshate than in isooctane.
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