TY - JOUR
T1 - Curdlan ester derivatives
T2 - Synthesis, structure, and properties
AU - Marubayashi, Hironori
AU - Yukinaka, Kazuyori
AU - Enomoto-Rogers, Yukiko
AU - Takemura, Akio
AU - Iwata, Tadahisa
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Scientific Research (A) (no. 22245026 ) from the Japan Society for the Promotion of Science .
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2014/3/15
Y1 - 2014/3/15
N2 - A series of ester derivatives of curdlan, which is a β-(1 → 3)-d-glucan extracellularly produced by microorganism, with varying alkyl chain lengths (C2-C12) were synthesized by the heterogeneous reaction using trifluoroacetic anhydride. As a result, high-molecular-weight (Mw ≥ 6 × 105) and fully-acylated curdlan was obtained with relatively high yield (>70%). Thermal stability of curdlan was greatly improved by esterification. Crystallization was observed for curdlan esters with C2-C6 side chains. Both Tg (170 → 50 C) and Tm (290 → 170 C) of curdlan esters decreased with increasing the side-chain length. By the increase in the side-chain carbon number, curdlan esters showed lower Young's modulus and tensile strength, and larger elongation at break. Thus, material properties of curdlan esters can be controlled by changing the side-chain length. It was found that the increase of the side-chain length resulted in the decrease of crystallinity and the change of crystal structures.
AB - A series of ester derivatives of curdlan, which is a β-(1 → 3)-d-glucan extracellularly produced by microorganism, with varying alkyl chain lengths (C2-C12) were synthesized by the heterogeneous reaction using trifluoroacetic anhydride. As a result, high-molecular-weight (Mw ≥ 6 × 105) and fully-acylated curdlan was obtained with relatively high yield (>70%). Thermal stability of curdlan was greatly improved by esterification. Crystallization was observed for curdlan esters with C2-C6 side chains. Both Tg (170 → 50 C) and Tm (290 → 170 C) of curdlan esters decreased with increasing the side-chain length. By the increase in the side-chain carbon number, curdlan esters showed lower Young's modulus and tensile strength, and larger elongation at break. Thus, material properties of curdlan esters can be controlled by changing the side-chain length. It was found that the increase of the side-chain length resulted in the decrease of crystallinity and the change of crystal structures.
KW - Curdlan
KW - Ester derivatives
KW - Properties
KW - Structure
KW - Synthesis
KW - β-(1 → 3)-d-Glucan
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U2 - 10.1016/j.carbpol.2013.12.015
DO - 10.1016/j.carbpol.2013.12.015
M3 - Article
C2 - 24528750
AN - SCOPUS:84892682867
SN - 0144-8617
VL - 103
SP - 427
EP - 433
JO - Carbohydrate Polymers
JF - Carbohydrate Polymers
IS - 1
ER -