adsorbed

Particle	Maximum adsorbed amount
	(μg-protein/mg-particle)
	pH (-)
	3.8	7	9
Anionic PP	28.86^A	0.79^R	0.33^R
Cationic PP	1.00^R	2.02^A	0.96^R
Zwitterionic PP	2.27^R	1.26^R	2.92^R

^A: attractive forces act between polymer particle and protein
^R: repulsive forces act between polymer particle and protein
A or R is judged by the pI of protein and Zeta potential of polymer particles in various buffer solution as shown in Table 1.

Table 3: Maximum adsorbed amount of BSA on polymer particles at various pH.