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On-body sweat analysis via the epidermal microfluidic patch. (a) Schematic diagram of the integrated sweat sensor for multicomponent analysis of sweat under arm movement. (b) Assay signals of sodium ion and glucose concentrations during one-hour exercise. (c) Color change on colorimetric stickers for the pH assay with passage of time. (d) pH and chloride ion concentration of sweat in two cavities were detected for different individuals.
