期刊
SCIENTIFIC REPORTS
卷 6, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep30479
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资金
- Advanced Low Carbon Technology Research and Development Program (ALCA) of the Japan Science and Technology Agency (JST)
- [26248044]
Bio-based polymer is considered as one of potentially renewable materials to reduce the consumption of petroleum resources. We report herein on the one-pot synthesis and development of unnatural-type bio-based polysaccharide, alpha-1,3-glucan. The synthesis can be achieved by in vitro enzymatic polymerization with GtfJ enzyme, one type of glucosyltransferase, cloned from Streptococcus salivarius ATCC 25975 utilizing sucrose, a renewable feedstock, as a glucose monomer source, via environmentally friendly one-pot water-based reaction. The structure of alpha-1,3-glucan is completely linear without branches with weight-average molecular weight (M-w) of 700 kDa. Furthermore, acetate and propionate esters of alpha-1,3-glucan were synthesized and characterized. Interestingly, alpha-1,3-glucan acetate showed a comparatively high melting temperature at 339 degrees C, higher than that of commercially available thermoplastics such as PET (265 degrees C) and Nylon 6 (220 degrees C). Thus, the discovery of crystalline alpha-1,3-glucan esters without branches with high thermal stability and melting temperature opens the gate for further researches in the application of thermoplastic materials.
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