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Title: In vitro synthesis of linear α-1,3-glucan and chemical modification to ester derivatives exhibiting outstanding thermal properties
Authors: Puanglek, Sakarin
Kimura, Satoshi
Enomoto-Rogers, Yukiko
Kabe, Taizo
Yoshida, Makoto
Wada, Masahisa  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-3508-3307 (unconfirmed)
Iwata, Tadahisa
Author's alias: 和田, 昌久
Keywords: Biopolymers
Polymers
Issue Date: 29-Jul-2016
Publisher: Springer Nature
Journal title: Scientific Reports
Volume: 6
Thesis number: 30479
Abstract: 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, α-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 α-1, 3-glucan is completely linear without branches with weight-average molecular weight (Mw) of 700 kDa. Furthermore, acetate and propionate esters of α-1, 3-glucan were synthesized and characterized. Interestingly, α-1, 3-glucan acetate showed a comparatively high melting temperature at 339 °C, higher than that of commercially available thermoplastics such as PET (265 °C) and Nylon 6 (220 °C). Thus, the discovery of crystalline α-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.
Rights: © The Author(s) 2016. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material.
URI: http://hdl.handle.net/2433/227422
DOI(Published Version): 10.1038/srep30479
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