FIGURE 1.

Shear rheology measurements during hydrogel photo-crosslinking. Samples were irradiated for 600 s (460 nm, 140 mW/cm²); measurements were performed up to 900 s. (A) Storage (G′) and loss (G″) shear moduli measured for the 0.50–0.10 A/DA-NH₂/A_PEGDA hydrogel formulation as a function of time. The irradiation period is displayed between the dashed lines. Samples were monitored for additional 300 s after irradiation. (B) Variation of G′ during and after light exposure for all investigated hydrogel formulations: 0.25 A/DA ratio (blue), 0.50 A/DA ratio (red) and 0.75 A/DA ratio (green); no hydrogel amino content (solid line), hydrogel amino contend NH₂/A_PEGDA molar ratio = 0.05 (dashed line) and hydrogel amino contend NH₂/A_PEGDA molar ratio = 0.10 (dotted line). Each curve is the average of measurements performed on n = 3 independent samples per formulation. Time 0 is here defined as the instant at which the light was switched on. Statistical analysis: one-way ANOVA considering plateau values of G′, p < 0.05.