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天然沙波宁糖酸的pH响应性自组装

Jiyang Cai¹, Yang Liu², Lulu Ma¹

¹Laboratory of Food Proteins and Colloids, School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, South China University of Technology, Guangzhou 510640, China.

Journal of colloid and interface science

|July 25, 2025

概括

甘酸自组装成不同的结构是pH-依赖的. 改变pH控制相互作用,形成纤维,捆或球体,对于设计先进材料至关重要.

科学领域:

超分子化学超分子化学
材料科学是一种材料科学.
生物材料是一种生物材料.

背景情况:

甘酸 (GA) 是一种天然的素生物表面活性剂.
由于其自组装特性和生物相容性,GA被用于超分子功能材料.
控制GA在溶液中的刺激反应自我组装的精确机制尚未完全理解.

研究的目的:

为了研究水溶液中的甘酸 (GA) 的pH依赖的自我组装行为.
阐明控制GA在pH范围2-8的层次性自我组装的潜在机制.
根据实验和模拟数据开发GA组装的综合模型.

主要方法:

使用了显微镜技术的组合.
采用了小角度X射线散射 (SAXS).
进行的核磁共振 (NMR) 光谱学.
进行异热定位热量计 (ITC).
执行了分子动力学 (MD) 模拟.

主要成果:

在pH~4时,GA形成纳米纤维,通过疏水性相互作用和来自二糖单元的静电排斥来稳定.
在pH值低于4的情况下,质子化会导致纳米纤维聚合成更厚的束,这是由于减少了静电排斥和增强了结合.
在pH 5以上,去质子化会导致纳米纤维的分解和重新组装成球形聚合物,其中有松散的核心和暴露的外.
在pH>8时,GA主要以单体的形式存在.

结论:

GA的自我组装是由pH控制的结合,疏水性和静电相互作用控制的.
在GA中碳基解离的程度决定了观察到的组装结构.
这些发现为设计使用糖酸的先进超分子材料提供了关键的见解.

关键词:

生物表面活性剂是生物表面活性剂.分离度的程度分离度.葡萄糖酸是什么? 葡萄糖酸是什么?纳米纤维素是如何形成的自动组装自动组装响应pH的反应性

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