Question

A polymer sphere of radious 0.2 cm containing a therapeutic protein at 0.1 mg/ml is placed in a large volume of buffer and the protein diffusses from the polymer to buffer. the buffer volume is large enough that the protein concentration can be considered zero. The protein diffusion coefficient is 5*10power -10 cm Sq /sec. determine the time required for the protein concentration at the center of the sphere to equal 5% of the initial concentration in the polymer?

Answer 1