Turbidimetric titration of (A, B) PCPP with PEO at various PCPP concentrations − 0.025% (1), 0.05% (2) and 0.075% (3) (0.2% PEO of 300,000 g/mol); (C) PCPP with PEO of various molecular weights − 665,000 (1), 300,000 (2), 100,000 (3), 35,000 (4), and 8,000 (5) g/mol (0.05% PCPP, 0.25% PEO, 420 nm, 0.05 M phosphate buffer, pH 7.4), and (D) PCPP with sodium chloride in the presence of 0% (1), 0.002% (2), 0.005% (3) 0.01% (4), 0.02% (5) of PEO (0.05% PCPP, molecular weight of polyether − 35,000 g/mol, 10% sodium chloride, 0.05 M phosphate buffer, pH 7.4).