Sulfonated polyvinyl alcohol hydrogel matrix (S-PVA hydrogel)

A sulfonated polyvinyl alcohol (S-PVA) hydrogel matrix is a specialized drug delivery platform designed to sequester and release positively charged (cationic) therapeutic agents. The matrix is composed of a polyvinyl alcohol backbone that has been chemically modified with sulfonic acid groups, which impart a permanent negative charge to the polymer network (Mandal et al., 2014, Journal of Applied Polymer Science). This anionic environment allows for high-capacity loading of cationic drugs through strong electrostatic interactions, effectively acting as an ion-exchange resin (Atta et al., 2015, Journal of Molecular Liquids). Upon administration, the release of the drug is triggered by the exchange of the drug cations with endogenous ions, such as sodium or potassium, found in physiological fluids (Peppas et al., 2000, European Journal of Pharmaceutics and Biopharmaceutics). This mechanism provides a controlled, sustained release profile that can be tuned by adjusting the degree of sulfonation or the crosslinking density of the hydrogel. S-PVA hydrogels are frequently investigated for applications in wound healing, transdermal delivery, and localized chemotherapy due to their biocompatibility and high water content. The system's performance is highly dependent on the ionic strength of the surrounding environment, which dictates the rate of ion exchange and subsequent drug diffusion.

Other names

Sulfonated PVAS-PVAAnionic PVA hydrogelSulfonated poly(vinyl alcohol)Cation-exchange hydrogel matrix

Electrostatic sequestration of cationic drugs followed by ion-exchange mediated release in physiological environments.