Table 2. Determined Values of the Determination Coefficient Which Were Obtained for Linear Regression Fitting of the Releasing Results with the Kinetic Models.

	determination coefficient (R2)
models	pH 5.5	pH 7.4
zero-order model	0.75	0.71
first-order model	0.97	0.88
Higuchi model	0.91	0.89
Hixson–Crowell model	0.91	0.83
Korsmeyer–Peppas model	0.92	0.86