I have made nanoparticle-BSA composite coated by chitosan.
I had experiment Zeta-potential to confirm the chitosan coating.
The result is indicate the sample is not coated by chitosan.
I think the reason is nanoparticle-BSA solution pH, the pH of nanoparticle-BSA composite solution is high appoximetely 9~10.
I think the solution is using buffer when dissolving BSA.