Table 2.

Release rate constant, k, and release exponent, n, of formulations

Formulations	Release rate constant, k	Release exponent, n
A-LCS(1)-HEC(0.3) (1.5 ton)	10.01	0.63
A-MCS(1)-HEC(0.1) (1 ton)	4.48	0.77
S-LCS(1)-HEC(0.1) (1.5 ton)	4.08	0.89
S-MCS(1)-HEC(0) (1.5 ton)	4.92	1.01
C-LCS(1)-HEC(0.3) (1.5 ton)	12.07	0.72
C-MCS(1)-HEC(0.1) (1.5 ton)	5.80	0.93

Abbreviations: A, acetic acid; S, succinic acid; C, citric acid; LCS, chitosan 50–190 kDa; MCS, chitosan 190–310 kDa; HEC, hydroxyethyl cellulose.