Fig. 4: Non-invasive GOx containing hydrogel-based blood glucose sensor.

a PVA/b-CD/GOx hydrogel responds to glucose via iontophoresis⁸⁴. b Integrated PVA/b-CD/GOx hydrogel patch. c Current measured at oxidation peaks of hydrogel responding to different glucose concentrations. Reprinted with permission from ref. ⁸⁴. Copyright 2019 Springer Nature.