Poly(vinyl sulfate) potassium salt is widely used in biochemical and medical research as a polyanionic compound. It is often employed in studies involving the interaction of polyanions with proteins, enzymes, and other biomolecules, helping to understand binding mechanisms and inhibition processes. In diagnostic applications, it serves as a reagent in assays to measure the activity of certain enzymes, particularly those that interact with sulfate groups. Additionally, it is utilized in the preparation of polyelectrolyte complexes for drug delivery systems, where it aids in stabilizing and controlling the release of therapeutic agents. Its polyanionic nature also makes it useful in water treatment processes for coagulating and removing impurities.