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Snapshot of Phase Transition in Thermoresponsive Hydrogel PNIPAM: Role in Drug Delivery and Tissue Engineering

机译:热响应水凝胶PNIPAM中相变的快照:在药物传递和组织工程中的作用

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摘要

Hydrogels are physically and chemically cross-linked, 3D, porous, hydrated molecular structures that mimic the native tissue microenvironment. Hydrogels fabricated with environmentally sensitive polymers can possess additional properties such as thermoresponsiveness. This property originates from its phase transition from gel to solution and vice versa with temperature variation. Phase transition mechanisms also depend on the interaction between the polymers and surrounding environment. Their thermoresponsiveness makes hydrogels attractive for drug delivery, gene therapy, cell culture, and tissue engineering approaches. The resemblance to living tissue of such thermoresponsive hydrogels produced by crosslinking of natural polymers opens up many biomedical application opportunities for human use. The most intensively studied natural thermoresponsive polymer is poly(N-isopropyl-acrylamide) (PNIPAM). This review focuses on the phase transition mechanism in thermoresponsive PNIPAM, the factors affecting the behavior of the gel, its specific properties, and, in particular, the role of PNIPAM's phase transition in drug delivery, cell culture, and tissue engineering.
机译:水凝胶是物理和化学交联的3D多孔水合分子结构,可模仿天然组织的微环境。用对环境敏感的聚合物制成的水凝胶可以具有其他特性,例如热响应性。该性质源自其随温度变化从凝胶到溶液的相变,反之亦然。相变机理还取决于聚合物与周围环境之间的相互作用。它们的热响应性使水凝胶对药物输送,基因治疗,细胞培养和组织工程学方法具有吸引力。通过天然聚合物的交联产生的这种热响应性水凝胶与活组织的相似性为人类使用打开了许多生物医学应用机会。研究最深入的天然热响应性聚合物是聚(N-异丙基丙烯酰胺)(PNIPAM)。这篇综述着重于热响应性PNIPAM中的相变机理,影响凝胶行为的因素,其特定性质,尤其是PNIPAM相变在药物递送,细胞培养和组织工程中的作用。

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