Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10236031 | Process Biochemistry | 2011 | 5 Pages |
Abstract
This paper discussed the use of a recombinant Escherichia coli whole-cell biocatalyst harboring a thermophilic lipase gene from Fervidobacterium nodosum in the catalytic synthesis of polyesters. The ring-opening polymerization of É-caprolactone was used as a model reaction to study the effects of temperature and reaction medium on monomer conversion and the molecular weight of the product. The whole-cell biocatalyst displayed high catalytic activity at high temperatures (70-90 °C), with almost 100% monomer conversion. Meanwhile, high monomer conversion values (>97%) were achieved in both hydrophobic and hydrophilic solvents, with the exception of dichloromethane (85%). Poly(É-caprolactone) was obtained in 100% monomer conversion, with a number-average molecular weight of 2000 g/mol and a polydispersity index of 1.47 in cyclohexane at 70 °C for 72 h. Furthermore, the whole-cell biocatalyst exhibited excellent operational stability, with monomer conversion values exceeding 90% over the course of 10 batch reactions. To verify the practicality of the procedure, scale-up reaction was also performed with isolated yield and number-average molecular weight of ca. 70% and 2140 g/mol, respectively.
Related Topics
Physical Sciences and Engineering
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Authors
Quanshun Li, Guangquan Li, Fuqiang Ma, Zuoming Zhang, Baisong Zheng, Yan Feng,