Table 1.

Correlation coefficients (R²), percentage saturation (%), rate constants (k), and half-life (t_1/2) of protocatechuic acid release at pH 7.4 and 4.8 PBS from GAGPA as derived from the models.

Sample pH	Correlation Coefficients (R2)			Percentage Saturation (%)	Rate Constant (k)	t1/2 (min)
	Pseudo-First Order	Pseudo-Second Order	Parabolic Diffusion
7.4	0.863	0.992	0.936	50	$4.9$ $\times$ ${10}^{-3}$	90
4.8	0.563	0.985	0.932	80	$2.3$ $\times$ ${10}^{-3}$	170