AI Article Synopsis
- Researchers used Candida antarctica lipase B to catalyze the ring-opening polymerization of five lactones in ionic liquids, producing poly(hydroxyalkanoates) with moderate molecular weights (up to 13,000).
- The study found that using the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethane)-sulfonimide and a low enzyme-to-lactone ratio led to significant degrees of polymerization for various lactones.
- Water-immiscible ionic liquids were more effective than water-miscible ones, and reducing the water content in the enzyme increased polymerization efficiency by up to 50%.
Article Abstract
Ring-opening polymerization of five lactones catalyzed by Candida antarctica lipase B in ionic liquids yielded poly(hydroxyalkanoates) of moderate molecular weights up to Mn=13,000. In the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethane)-sulfonimide and with a low weight ratio of enzyme to lactone (1:100) we obtained polymers from beta-propiolactone, delta-valerolactone, and epsilon-caprolactone with degrees of polymerization as high as 170, 25, and 85, respectively; oligomers from beta-butyrolactone and gamma-butyrolactone with degrees of polymerization of 5; and a copolymer of beta-propiolactone and beta-butyrolactone with a degree of polymerization of 180. Water-immiscible ionic liquids were superior to water-miscible ionic liquids. Reducing the water content of the enzyme improved the degree of polymerization by as much as 50% for beta-propiolactone and epsilon-caprolactone.
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| http://dx.doi.org/10.1016/j.jbiotec.2007.04.001 | DOI Listing |
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