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. Author manuscript; available in PMC: 2015 Oct 3.
Published in final edited form as: Biomacromolecules. 2014 Jun 24;15(7):2808–2816. doi: 10.1021/bm500731b

Figure 2.

Figure 2

(a) Chemical structures showing the degradation of the bond cross-linking the hydrogel network. Cleavage occurs between the tertiary carbon and the amide nitrogen in a radical-mediated mechanism. Degradation of the same hydrogels under 204 mW/cm2 (blue), 154 mW/cm2 (red), and 102 mW/cm2 (green) UV irradiation (mercury arc lamp with 320 nm–390 nm bandpass filter) along with first-order fits. The absorbance spectrum of the nitrobenzyl cleavable unit is shown in the inset along with the bands used for degradation (334 and 365 nm).