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The statistical evaluation (Students’s t-test) of IBU release for particular groups of the hydrogels, characteristic by their charge. Comparison of (a) cationic hydrogels with neutral ones, p = 0.000, (b) cationic hydrogels with anionic ones, p = 0.000, (c) neutral hydrogels with anionic ones, p = 0.044, (d) neutral hydrogel (4% MC) with anionic one (6% NaCMC), having similar viscosities of 32.05 and 40.04 N.S m−2 at shear rate 6.45 s−1, respectively, p = 0.012.
