How to design nano-particulate system to which water soluble protein drugs may be encapsulated with a thermodynamically favoured process and with preserved native conformation??
I have not participated in the design of the system, but have utilized a few processes to form nanoparticles - mostly nanoprecipitation by solvent evaporation/sublimation. With wanting to keep the water soluble protein in native conformation at all steps of the encapsulation process, I'd consider looking into properties of different solvents: density, hydrophilicity/phobicity, miscibility, pH, and salt content along with the solvent interactions with protein, monomers, and other solvents. Some resources I'd also consider:
The greener synthesis of nanoparticles (doi:10.1016/j.tibtech.2013.01.003)
Development of a nanoprecipitation method intended for the entrapment of hydrophilic drugs into nanoparticles (doi:10.1016/j.ejps.2004.09.011)
G. Cao has a book: "Nanostructures and nanomaterials: synthesis, properties and applications"