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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/).
Illustration of the urate biosensing mechanism based on enzyme-induced oxygen depletion coupled with oxygen-responsive phosphors immobilized in a biocompatible hydrogel matrix. Urate concentration is proportional to phosphorescence intensity and lifetime.