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PHOTORESPONSIVE HYDROGELS. Rabia Dhillon

PHOTORESPONSIVE HYDROGELS.

Rabia Dhillon

International Journal of Natural Product Science 2012: Spl Issue 1:128.

Abstract(RBIP-128)

Hydrogels that undergo physicochemical changes upon the application of stimuli are of great interest for biomedical research, drug development and clinical applications.The use of light energy to control the molecular release of loads from hydrogels can be performed with photons of different wavelengths. The focus is on hydrogel systems that can show gel-to-sol transition by light irradiation, since the control of the erosion of polymeric network is particularly interesting for biotechnology related applications including development of drug delivering and tissue engineering. The network structure of the hydrogel matrices can be used to encapsulate macromolecules including proteins. Photoresponsive hydrogels typically consist of a polymeric network and a photoreactive moiety, a photochromic chromophore that captures the optical signal. The chromophores in the photoreceptor convert the photoirradiation to a chemical signal through a photoreaction - isomerization, cleavage and dimerization which controls the properties of the hydrogel. The methods to introduce photoresponsiveness to hydrogel systems; modification of hydrogels with photoresponsive groups, modification of polymer with supramolecularly interacting groups that can respond to photoirradiation, and supramolecular hydrogel formation of photoresponsive low-molecularweight-gelators. Photoresponsive hydrogel systems are potentially useful for drug delivery systems for controlled release and cancer therapy.
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