Curdlan ester derivatives: Synthesis, structure, and properties

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• 作者：Hironori Marubayashi ; Kazuyori Yukinaka ; Yukiko Enomoto-Rogers ; Akio Takemura ; Tadahisa Iwata
• 关键词：Curdlan ; 尾-(1  ; &rarr ;   ; 3)-d-Glucan ; Ester derivatives ; Synthesis ; Structure ; Properties
• 刊名：Carbohydrate Polymers
• 出版年：15 March, 2014
• 年：2014
• 卷：103
• 期：Complete
• 页码：427-433
• 全文大小：847 K

文摘

A series of ester derivatives of curdlan, which is a 尾-(1 鈫?#xA0;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 (M_w 鈮?#xA0;6 脳 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 T_g (170 鈫?#xA0;50 掳C) and T_m (290 鈫?#xA0;170 掳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.