Kinetic and fitting parameters for drug release data fit to various equations.

Hydrogels	Models
	Higuchi		Ritger–Peppas			Peppas–Sahlin			Zero-order
	k H	R 2	n	k RP	R 2	k 1	k 2	R 2	k 0	R 2
HG@UT	0.231	0.842	0.91	0.144	0.999	0.037	0.108	0.999	0.128	0.994
HG@Ar	0.246	0.870	0.82	0.181	0.996	0.077	0.105	0.997	0.151	0.971
HG@O2	0.282	0.876	0.81	0.211	0.999	0.093	0.118	0.998	0.173	0.970
HG@Ar + O2	0.286	0.878	0.78	0.237	0.999	0.115	0.121	0.998	0.200	0.951