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. 2019 Jun 6;19(11):2584. doi: 10.3390/s19112584

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(A) Typical amperometric I-t response and calibration curve (inset) during successive 10 μM injections of xanthine at a Pt-Ir wire electrode (+0.35V) modified with XOx-doped PTMS xerogels, polyurethane layer (100% HPU), and epoxy cap. (B) Typical amperometric I-t response and (C) calculated selectivity coefficients during successive injections of common interferent species (40 μM and/or 100 μM) and xanthine (10 μM and/or 30 μM) at a Pt-Ir wire electrode (+0.35V) modified as in (A); Solution: 60.0 mM PBS, pH = 7.4, μ = 155 mM. Note: The error bars represent standard error (n ≥ 10).