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. Author manuscript; available in PMC: 2010 Jul 20.
Published in final edited form as: J Control Release. 2009 Mar 31;137(2):152–159. doi: 10.1016/j.jconrel.2009.03.016

Fig. 2.

Fig. 2

Optical transmissivities of 3, 4, 5 and 6% hydrogels prepared using copolymer and crosslinker in 1:1 or 1:2 stoichiometry. The statistically significant different groups are denoted by * (p<0.05) and ** (p<0.01). The optical transmissivities of the hydrogel decreases with increase in copolymer and crosslinker concentration. All the hydrogels were found to be transparent or close to transparent.