Abstract
Biomass plastics are expected to contribute to the establishment of a carbon-neutral society by replacing conventional plastics derived from petroleum. The biomass-derived aromatic amine 4-aminocinnamic acid (4ACA) produced by recombinant bacteria is applied to the synthesis of high-performance biopolymers such as polyamides and polyimides. Here, we developed a microbial catalyst that hydrogenates the α,β-unsaturated carboxylic acid of 4ACA to generate 4-aminohydrocinnamic acid (4AHCA). The ability of 10 microbial genes for enoate and xenobiotic reductases expressed in Escherichia coli to convert 4ACA to 4AHCA was assessed. A strain producing 2-enoate reductase from Clostridium acetobutylicum (ca2ENR) reduced 4ACA to 4AHCA with a yield of > 95% mol mol−1 and reaction rates of 3.4 ± 0.4 and 4.4 ± 0.6 mM h−1 OD600 −1 at the optimum pH of 7.0 under aerobic and anaerobic conditions, respectively. This recombinant strain reduced caffeic, cinnamic, coumaric, and 4-nitrocinnamic acids to their corresponding propanoic acid derivatives. We polycondensed 4AHCA generated from biomass-derived 4ACA by dehydration under a catalyst to form high-molecular-weight poly(4AHCA) with a molecular weight of M n = 1.94 MDa. This polyamide had high thermal properties as indicated by a 10% reduction in weight at a temperature of T d10 = 394 °C and a glass transition temperature of T g = 240 °C. Poly(4AHCA) derived from biomass is stable at high temperatures and could be applicable to the production of high-performance engineering plastics.
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This work was supported by the Japan Science and Technology Agency CREST (Grant Number JPMJCR13B3), Japan.
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Kawasaki, Y., Aniruddha, N., Minakawa, H. et al. Novel polycondensed biopolyamide generated from biomass-derived 4-aminohydrocinnamic acid. Appl Microbiol Biotechnol 102, 631–639 (2018). https://doi.org/10.1007/s00253-017-8617-6
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DOI: https://doi.org/10.1007/s00253-017-8617-6