Table 1. Zeta potential values of protein A solution at different pH values pH values Zeta potential (mV) 25.6 2.1 2.8 22.1 3.4 18.0 4 Correlation Coefficient 4.5 5 5.7 6.3 8.2 A a. Solutions of an A protein at different pH values were prepared and the zeta potential values of the solutions were obtained by electrophoretic light scattering spectroscopy method. In which two pH ranges is the isoelectric point of protein A and explain why (5 Points). Order the stability of the solutions at different pH values from largest to smallest. (5 Points) 11.2 3.9 1.2 -1.7 B -4.4 -15.0 Time (us) b. Compare the correlation graphs of the two different samples (A and B) given above according to their particle sizes and polydispersities. (10 Points)

Table 1. Zeta potential values of protein A solution at different pH values a. Solutions of an A protein at different pH values were prepared and the zeta potential values of the solutions were obtained by electrophoretic light scattering spectroscopy method. In which two pH ranges is the isoelectric point of protein A and explain why (5 Points). Order the stability of the solutions at different pH values from largest to smallest. (5 Points) b. Compare the correlation graphs of the two different samples ( A and B ) given above according to their particle sizes and polydispersities. (10 Points)