用流变学和分子动力学模拟研究离子和非离子变性剂中黄原胶的降解。
The degradation of xanthan gum in ionic and non-ionic denaturants studied by rheology and molecular dynamics simulation.
机构信息
School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, South Korea.
School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, South Korea.
出版信息
Carbohydr Polym. 2021 Jan 1;251:117061. doi: 10.1016/j.carbpol.2020.117061. Epub 2020 Sep 11.
The use of xanthan gum (XG) as a thickener increases solution viscosity, and therefore, the cost of subsequent processes such as fluid transportation and purification. Herein, we investigate the degradation of XG by urea, sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB). The results showed that CTAB degraded the XG more than SDS or urea. Interestingly, the degree of CTAB-induced degradation varied with the concentration regime. Thus, increasing CTAB concentration from 0.01 to 0.1 M decreased the complex viscosity (|η*|), whereas from 0.2 to 0.5 M the |η*| increased. For XG/SDS, the |η*| was unchanged with increasing SDS concentration from 0.01 to 0.1 M, whereas it decreased from 0.2 to 0.5 M. For XG/urea, the |η*| was stable in all concentrations. At the atomic-scale, computer simulations revealed that the degrading effect of CTAB was due to preferential interaction with the XG sidechain. These findings can enhance industrial applications of XG.
黄原胶（XG）作为增稠剂的使用会增加溶液的黏度，因此会增加后续工艺（如流体输送和纯化）的成本。在此，我们研究了尿素、十二烷基硫酸钠（SDS）和十六烷基三甲基溴化铵（CTAB）对 XG 的降解作用。结果表明，CTAB 对 XG 的降解作用强于 SDS 或尿素。有趣的是，CTAB 诱导的降解程度随浓度范围而变化。因此，将 CTAB 浓度从 0.01 增加到 0.1 M 会降低复合黏度（|η*|），而从 0.2 增加到 0.5 M 时，|η*|会增加。对于 XG/SDS，随着 SDS 浓度从 0.01 增加到 0.1 M，|η*|保持不变，而从 0.2 增加到 0.5 M 时则降低。对于 XG/urea，在所有浓度下|η*|均保持稳定。在原子尺度上，计算机模拟表明，CTAB 的降解作用是由于其与 XG 侧链的优先相互作用。这些发现可以增强 XG 的工业应用。
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