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首页> 外文期刊>Journal of Applied Polymer Science >Aggregation behavior of 3,6-O-carboxymethylated chitin in aqueous solutions
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Aggregation behavior of 3,6-O-carboxymethylated chitin in aqueous solutions

机译：3,6-O-羧甲基甲壳素在水溶液中的聚集行为

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摘要

The aggregation behavior of 3,6-O-carboxymethylated chitin (3,6-O-CM-chitin) in aqueous solutions was investigated by viscometry, gel permeation chromatography (GPC), and GPC combined with laser light scattering (GPC-LLS) techniques. 3,6-O-CM-chitin has a strong tendency to form aggregates in NaCl aqueous solutions with the apparent aggregation number (N-ap) of about 27. There were three kinds of aggregates corresponding to different cohesive energies, the aggregates with low cohesive energy were first dissociated at 60degreesC, the aggregates with middle cohesive energy were then dissociated at 80 to 90degreesC, and the aggregates with high cohesive energy were difficult to be disrupted by heating. Decreasing polysaccharide concentration (c(p)) or increasing NaCl concentration (c(s)) reduced the content of the aggregates. At the critical c(p) of 2.5 X 10(-5) g/mL, the aggregates were dissociated into single chains completely. The change of aggregation and disaggregation of 3,6-O-CM-chitin in water-cadoxen mixtures occurred from 0.1 to 0.4 of v(cad) and were irreversible. Intermolecular hydrogen bonding can be ascribed as main driving force for aggregation. (C) 2002 Wiley Periodicals, Inc. [References: 26]
机译：通过粘度测定，凝胶渗透色谱法（GPC）和GPC结合激光散射（GPC-LLS）研究了3,6-O-羧甲基甲壳质（3,6-O-CM-甲壳质）在水溶液中的聚集行为技术。 3,6-O-CM-甲壳素在NaCl水溶液中有很强的聚集趋势，其表观聚集数（N-ap）约为27。存在三种对应于不同内聚能的聚集体，这些聚集体具有较低的内聚能首先将内聚能在60℃下解离，然后将具有中等内聚能的聚集体在80至90℃下解离，并且高内聚能的聚集体难以通过加热破坏。降低多糖浓度（c（p））或增加NaCl浓度（c（s））都会减少聚集体的含量。在2.5 x 10（-5）g / mL的临界c（p）下，聚集体完全解离为单链。 3，6-O-CM-甲壳素在水-镉混合物中的聚集和解离变化发生在v（cad）的0.1到0.4之间，并且是不可逆的。分子间氢键可归因于聚集的主要驱动力。 （C）2002 Wiley Periodicals，Inc. [参考：26]

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