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. 2020 Aug 27;187(9):520. doi: 10.1007/s00604-020-04510-5

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Measurements in artificial perspiration solution, pH 5.5, room temperature. (a) Chronoamperometry and (b) calibration at − 5 mV vs. Au pseudo-ref. electrode. Inset shows magnification of the smallest concentrations. (c) Real-time measurement of 10 μM ascorbic acid (AA) by direct drop casting. (d) Real-time measurement of sweat with and without ascorbic acid by sample delivery through filter paper