BSA adsorption in 5 mM Tris.HCl, pH 7.4 affects silica/DODAB particle size and zeta-potential. Size distribution and zeta-potential (ζ) for dispersions in 5 mM Tris.HCl, pH 7.4. In (A), 500 μg/ml BSA. In (B), 0.1 mg/ml silica and 0.05 mM DODAB BF dispersion. From C to E, 0.1 mg/ml silica, 0.05 mM DODAB BF dispersion and BSA at 0.005 (C), 0.02 (D) and 0.03 mg/ml (E). Interaction between components in the mixtures took place over 1 h before measurements. In each subfigure, mean zeta-potential and diameter ± SE are quoted.