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» 生物材料中的分子自组装

生物材料中的分子自组装

1990
展示生物医学应用生物材料分子自组装的实验室场景。

(图片仅供参考)

分子自组装是一个“自下而上”的过程,在这个过程中,分子无需外部引导即可自发地组织成有序结构。这种现象是由氢键、疏水效应等非共价相互作用驱动的。 范德华力 力在生物学中至关重要(例如,蛋白质折叠、脂质双层形成)。在生物材料领域,人们利用力来构建复杂的纳米结构材料,例如水凝胶和纳米纤维,用于生物医学应用。

Self-assembly provides a powerful paradigm for creating biomaterials that mimic the hierarchical complexity of biological tissues. The process is thermodynamically driven, seeking a minimum Gibbs free energy state. The design begins with molecular building blocks, often amphiphilic molecules (containing both hydrophilic and hydrophobic parts) such as block copolymers or peptide amphiphiles (PAs). When placed in an aqueous environment above a critical concentration, these molecules arrange themselves to minimize the unfavorable contact between their hydrophobic segments and water. This can lead to various nanostructures, including spherical micelles, cylindrical nanofibers, or planar bilayers, with the final morphology dictated by molecular geometry and packing parameters. A key advantage is the ability to encode biological function directly into the building blocks. For example, a PA can be designed with a peptide sequence containing the RGD motif, a well-known cell adhesion ligand. Upon self-assembly into nanofibers, this motif is displayed on the fiber surface, creating a scaffold that actively promotes cell attachment. These systems are often dynamic and responsive. A change in pH, temperature, or ionic strength can trigger a structural transition, allowing for the creation of ‘smart’ materials. For instance, a self-assembling peptide solution can be designed to be liquid for easy injection but form a solid hydrogel scaffold at body temperature, entrapping cells and drugs at a target site for regenerative medicine applications.

UNESCO Nomenclature: 2209
聚合物化学

类型

化学过程

中断

基础

用法

新兴技术

前体

  • 了解非共价力(氢键、范德华力)
  • 发现细胞膜的脂质双层结构
  • 研究蛋白质折叠和四级结构
  • 聚合物化学的发展,特别是嵌段共聚物
  • 莱恩、佩德森和克拉姆在超分子化学领域获得诺贝尔奖的作品

应用程序

  • 制造用于组织工程的模拟天然细胞外基质的纳米纤维支架
  • 用于药物输送和细胞封装的可注射水凝胶的开发
  • 开发响应式“智能”材料,使其能够根据 pH 值或温度等刺激改变自身特性。
  • 形成纳米载体(如胶束和囊泡)用于靶向治疗
  • 防止生物污染的表面涂层

专利:

NA

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相关领域:自组装、自下而上、超分子化学、非共价相互作用、水凝胶、纳米纤维、两亲分子、嵌段共聚物、智能材料、肽两亲分子。

历史背景

生物材料中的分子自组装

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