Journal
POLYMER DEGRADATION AND STABILITY
Volume 96, Issue 4, Pages 499-504Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2011.01.007
Keywords
Polylactide; Biodegradable plastic; Microbial cell factory; PDLA; Biological PLA
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [70216828, B01]
- New Energy and Industrial Technology Development Organization (NEDO) of Japan
- Nagase Science Technology Foundation of Japan
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A poly(lactic acid) (PLA)-like terpolyester consisting of 96 mol% lactate (LA). I mol% 3-hydroxybutyrate and 3 mol% 3-hydroxyvalerate was produced in recombinant Escherichia coli LS5218 expressing LA-polymerizing enzyme (LPE). The strain was grown on glucose with a feeding of valerate as the monomer precursor. The glass transition and melting temperatures of the terpolyester were close to those of chemically synthesized poly(L-LA)s (PLLAs) having similar molecular weights. Additionally, a blend of the terpolyester, which was composed entirely of (R)-LA (D-LA) due to the strict enantiospecificity of LPE, with PLLA formed a stereocomplex with higher melting temperature (201.9 degrees C). These results indicate that the biological PLA-like polyester produced via this one-step microbial process has comparable thermal properties to chemically synthesized PLAs. (C) 2011 Elsevier Ltd. All rights reserved.
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