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Enzymatic grafting of amylose on chitin nanofibers for hierarchical construction of controlled microstructures

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Abstract

We have previously reported that re-dispersible amidinium chitin nanofibers are obtained from an amidinated chitin by CO2 gas bubbling with ultrasonic treatment in water. On the other hand, amylose is precisely synthesized by phosphorylase-catalyzed enzymatic polymerization. In this study, grafting of amylose on the amidinium chitin nanofibers was investigated by the phosphorylase-catalyzed enzymatic polymerization to produce amylose-grafted chitin nanofiber materials. Depending on the reaction conditions, the reaction mixtures turned into hydrogels. The hydrogels were constructed via the formation of double helixes from a part of amylose graft chains closely present among the nanofibers. Microstructures, which were hierarchically constructed by lyophilization of the hydrogels, were changed from network to porous morphologies in accordance with the molecular weights of amylose graft chains. Most of the amylose graft chains with higher molecular weights, which did not participate in double helixes, formed amorphous membranes in the nanofiber networks by lyophilization, to construct porous structures.

Graphical abstract: Enzymatic grafting of amylose on chitin nanofibers for hierarchical construction of controlled microstructures

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Publication details

The article was received on 28 Mar 2017, accepted on 25 Apr 2017 and first published on 05 May 2017


Article type: Paper
DOI: 10.1039/C7PY00521K
Citation: Polym. Chem., 2017, Advance Article
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    Enzymatic grafting of amylose on chitin nanofibers for hierarchical construction of controlled microstructures

    N. Egashira, K. Yamamoto and J. Kadokawa, Polym. Chem., 2017, Advance Article , DOI: 10.1039/C7PY00521K

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