Abstract
Polymers can be crosslinked chemically or physically to create three-dimensional hydrogel particles with sub-micron dimensions, known as nanogels. Their customizable size, ease of manufacture, expansion potential, bio-integration, water affinity, and reactivity to various stimuli, including temperature, pH, light, and biological agents, provide them with considerable advantages over conventional drug delivery techniques. Nanogels possess properties of both hydrogels and nanoparticles and can be categorized into nanohydrogels and nano-organogels. These systems exhibit exceptional drug-loading capability, stability, biological consistency, and environmental responsiveness. Their hallmark lies in their swelling behavior, enabling substantial water absorption while maintaining structural integrity. Preparation methods involve polymer precursors or heterogeneous polymerization of monomers. Nanogels are promising for various drug administration techniques, including local anesthetics, vaccines, and transdermal drug delivery, due to their ability to encapsulate multiple bioactive ingredients, enhancing therapeutic efficacy and stability.
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