Colloidal metal dispersions as catalysts for selective surface hydrogenation of biomembranes. Part 2. Preparation of nanosize platinum metal catalysts and characterization in hydrogenation of water soluble olefins and synthetic biomembrane models

Abstract

Aqueous dispersions of PVP-protected Pd, Pt, Rh, PdPt and PdRh colloids (PVP=poly(2-vinylpyrrolidone)) were successfully applied for the catalytic hydrogenation of water soluble olefins and liposomes as models of biological membranes. The metal-PVP particles were anchored onto the surface of water insoluble, crosslinked poly(2-vinylpyrrolidone), PVPP. Both the sols and the supported catalysts are stable in time, non-permeable to the lipid membrane, and can be separated completely from the reaction mixture by decantation or centrifugation.