Hydrogel- a review

Hydrogel’s may be defined as a network of polymer chains that are hydrophilic, water insoluble sometimes found as a colloidal gel in which water is a dispersion medium. Their ability to absorbed water is because of its cross linking network structure which is formed by polymer bearing hydrophilic groups. Hydrogel’s are insoluble due to the presence of chemical and physical cross-links Such as entanglements. It is also respond to the fluctuation of environmental stimuli (ionic strength, temperature. pH, presence of enzyme etc.) and swell or shrink accordingly in the swollen state they are soft and rubbery resembling the living tissue exhibiting excellent biocompatibility Hydrogel are commonly used in clinical practice and experimental medicine for a wide range of applications, including food additives, Tissue engineering, regenerative medicines, Pharmaceuticals drug delivery devices and membranes for biosensors etc.