Adsorption isotherms for cAbBCII10 VHH (open circles), VHHZnOBP1 (closed circles), 3D2 VHH (open triangles), 3E2 VHH (closed triangles), 4D4 VHH (open squares), and 4F2 VHH (closed squares) against 0.2 mg of ZnO particles in 10 mm phosphate solution (pH 7.5; 200 mm NaCl, 0.05% Tween 20).