Figure 1.

Characterization of the ACG hydrogel. (A) The tilted ALG–Ca hydrogel (left) and ACG hydrogel (right). (B) The photograph of ACG hydrogel (upright and inverted). (C) The pattern of “ALG–Ca–GP” is coherently formed by the ACG hydrogel with a 1 mL syringe. SEM image of ALG–Ca hydrogel (D) and ACG hydrogel (E), Scale bar: 20 μm. (F) UV–vis–NIR absorption spectra of ACG + BSA (10 mg/mL) hydrogel, ACG hydrogel, ALG–Ca hydrogel, GP and CaCl₂ after fourfold dilution.