Effect of structure features of polysaccharides on properties of dialdehyde polysaccharide tanning agent
Effect of structure features of polysaccharides on properties of dialdehyde polysaccharide tanning agent
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多糖结构特征对二醛多糖鞣剂性能的影响
DOI：
10.1016/j.carbpol.2018.08.111
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发表时间：
2018-12-01
影响因子：
11.2
通讯作者：
Shi, Bi
中科院分区：
文献类型：
--
作者：
Ding, Wei;Wang, Ya-nan;Shi, Bi
将海藻酸钠（SA）、卡拉胶（TG）、淀粉（ST）和环糊精（CD）用等量的高酸钠氧化成双醛多糖（DAPs）。研究了多糖结构特征对DAPs醛基含量、分子大小和鞣制性能的影响。在实验条件下，每种DAP均含有丰富的醛基（bbb7 mmol/g），用于皮草鞣制，当使用低分子量、线性链的多糖时，可以得到醛基含量较高的DAP。较低的结晶度和β -(1 - bbbb4)糖苷键有利于多糖的降解。与双醛ST （M-w -> - 15万）和双醛CD （M-w < 500）相比，β -(1 -> - 4)连接的无定形SA和TG制备的DAPs具有中等的分子大小（M-w 1.5万-3万），在胶原纤维网络中具有令人满意的渗透性和交联反应性，因此在更高的收缩温度和毛皮白度方面具有更有利的鞣制性能。这表明β -(1 - bbbb4)连接的无定形多糖适于制备双醛鞣剂。
Sodium alginate (SA), Cara gum (TG), starch (ST) and cyclodextrin (CD) were oxidized to dialdehyde polysaccharides (DAPs) using equivalent sodium periodate. The effects of polysaccharide structure features on aldehyde group content, molecular size and tanning performance of DAPs were investigated. Each DAP had abundant aldehyde groups (> 7 mmol/g) for fur tanning in the experimental conditions, and DAP with higher aldehyde group content was obtained when polysaccharide with lower molecular weight and linear chain was used. Lower crystallinity and beta-(1 -> 4) glycosidic linkage of polysaccharide benefited its degradation. Compared with dialdehyde ST (M-w > 150,000) and dialdehyde CD (M-w < 500), DAPs prepared from beta-(1 -> 4)-linked amorphous SA and TG had moderate molecular sizes (M-w 15,000-30,000) and exhibited satisfactory penetrability and crosslinking reactivity in collagen fiber network, and thus performed more favorable tanning properties in terms of higher shrinkage temperature and whiteness of fur. This suggests the suitability of beta-(1 -> 4)-linked amorphous polysaccharides for preparing dialdehyde tanning agents.