Kinetics of protein adsorption/desorption mediated by pH-responsive polymer layer*
Su Xiao-Hang, Lei Qun-Li, Ren Chun-Lai
       
Schematic representation of the modeled system that weak polyelectrolyte chains grafted on the surface are immersed in the protein solution, which also includes small ions: cations, anions, hydrogens, and hydroxyl groups. The big red spheres refer to big charged proteins. The wired purple spheres are undissociated weak polyelectrolyte monomers and the interspersed orange spheres are dissociated ones. The small blue spheres are ions with positive charge, and the brown spheres are ions with negative charge. The direction perpendicular to the surface is denoted by z .