Parameter values of biphasic model. ‘θ_b’ is the contribution of initial burst release over total mass drug release, ‘k_b’ is the initial burst constant, ‘k_d’ is the diffusion kinetic constant, ‘n’ is the diffusion exponent, dt represents the time shift.

	θ b	k b	k d	n	dt
Valsartan	0.69	0.045	4.65 × 10−4	1.012	118.7
EC-valsartan	0.75	0.029	3.01 × 10−4	1.011	117.3
PMMA-valsartan	0.64	0.017	1.56 × 10−4	1.011	116.4