Figure 3.
(a) Optical images of hydrogels after incubation at pH 3, pH 8.5 and pH 9 for 24 h, (b) Swelling ratios of HM, HMD, HMDc, HMDA and HMDcA at pH 3, 8.5 and 9. *p < 0.05 when compared to the hydrogel incubated at pH 3 for a given composition.
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