Fig. 2
From: Peptide hydrogel with self-healing and redox-responsive properties
A hydrogel formed from F9 4ʹPyA and Cu(II) dissolves after 5 min when ascorbate is added. A Vials containing hydrogel samples assembled using F9 4ʹPyA (1 wt%) and 1 equiv of Cu(II) in buffer (50 mM HEPES, pH 8). Hydrogel samples (300 µL) were set by incubation at 37 °C overnight and then the buffer (50 mM HEPES, 5 mM NaCl, pH 8) containing (vial 2) or not (vial 1) ascorbate (5 equiv vs Cu(II)) was added and the picture taken in 5 min. B EPR spectra acquired at room temperature of the hydrogel formed by F9 4ʹPyA and 1 equiv Cu(II). Red spectrum corresponds to 7 mM peptide/copper (1 wt% peptide) and black spectrum shows sample after reduction of Cu(II) (3.5 mM peptide/copper) to Cu(I) by ascorbate (5 equiv)