Fig. 5
A Storage modulus of the GPG and GPG-RGD hydrogels with various polypeptide concentrations (0.050–0.889 wt%) formed after 1 d at 37 °C. Time sweep measurements (1 Hz, 1% strain) were performed for each sample after being transferred to the sample stage of a rheometer, and the G′ values at 3600 s were plotted. The dashed lines represent fits to the data points; the equation of the line for the GPG is G′ = 3.48 × 103C1.53, R2 = 0.984, and for the GPG-RGD: G′ = 2.76 × 103 C1.65, R2 = 0.947). B Photograph of the sol‒gel transition of the GPG hydrogel (0.4 wt%). C Changes in G′ and G″ of the 0.5 wt% GPG-RGD hydrogel formed after 7 d in step-strain sweep dynamic rheological measurements (1 Hz). Reproduced from ref. [28] under Creative Commons CC BY 4.0 License. Copyright 2021, The Authors
