Question

A gold surface was grafted with a polymer. The ends of this polymer are tagged with 4 pendant groups: namely group A, B, C and D. The pendant groups are weak acids. The modified isoelectric point of the entire polymer were calculated to be as follows:

Group pI
A 4.5
B 5.5
C 7.4
D 9


These particles are loaded with a positively charged drug on the surface using electrostatic interaction in PBS (pH=7.4). Which of the following will have minimum loading?​

Answer 1

Answer:

B ...................