Polyvinyl alcohol (PVA, Poly (Ethenol)) (Mw 31000-50000, 87-89% hydrolyzed) is a polymer with emulsifying and stabilizing properties, with a degree of hydrolysis of 87-89%. Polyvinyl alcohol (Mw 31000-50000, 87-89% hydrolyzed) mainly acts as a stabilizer in the preparation of nanomedicines, it not only maintains the structural integrity of PEGylated PLGA nanoparticles during double emulsion synthesis, but also facilitates the preparation of chitosan/matrine-PLGA nanoparticle aqueous solutions and lipid-polymer nanoparticles. Polyvinyl alcohol (Mw 31000-50000, 87-89% hydrolyzed) can be widely used in research related to fields such as breast cancer[1][2][3].