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Chemoenzymatic Synthesis of Amylose-Grafted Chitosan

✍ Scribed by Shun-ichi Matsuda; Yoshiro Kaneko; Jun-ichi Kadokawa

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
137 KB
Volume
28
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

An amylose‐grafted chitosan has been synthesized by a chemoenzymatic method according to the following two reactions. First, maltoheptaose is introduced to chitosan by a reductive amination using sodium cyanotrihydroborate in a mixed solvent of 1.0 mol · L^−1^ aqueous acetic acid and methanol at room temperature to produce a maltoheptaose‐grafted chitosan that has a well‐defined molecular structure. A phosphorylase‐catalyzed enzymatic polymerization of α‐D‐glucose 1‐phosphate is then performed from the maltoheptaose‐grafted chitosan to obtain the amylose‐grafted chitosan. This material does not dissolve in any solvent, e.g., aqueous acetic acid and dimethyl sufoxide, which are good solvents for chitosan and amylose, respectively.

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