Uric acid electrochemical biosensor based on a laser-induced graphene electrode modified with a Honey-mediated nanocomposite of reduced graphene oxide and bimetallic silver–cobalt

W4415350638 · 수집 2026-10-04 18:16:49

T10660 Conducting polymers and applications

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Abnormal uric acid (UA) levels are commonly linked to several metabolomic or internal organ problems. Electrochemical-based tests have been used as alternative early screening methods to determine the levels of biomarkers, including UA. Electrochemical biosensors based on laser-induced graphene (LIG) electrodes could offer a promising alternative to realize a low-cost biosensor for biomarker detection. In this study, an LIG electrode was modified with a nanocomposite composed of reduced graphene oxide and silver-cobalt bimetal (rGO/AgCo), resulting in its enhanced sensitivity and selectivity for the detection of UA. Furthermore, to promote eco-friendliness, honey was utilized as the mediator to reduce and stabilize the nanoparticles during the creation of the nanocomposite. Differential pulse voltammetry (DPV) test results revealed that the nanocomposite-modified electrode exhibited excellent selectivity and electrochemical characteristics for the detection of UA, with a linear range of 0.1-2000 μM, limit of detection (LOD) of 3.75 μM, limit of quantification (LOQ) of 11.36 μM, and sensitivity of 1.76 μA μM<sup>-1</sup> cm<sup>-2</sup>. These results indicated the synergistic effect of the rGO/AgCo nanocomposite in facilitating a higher conductivity and larger surface sensing area for the LIG electrode. Moreover, with such a low concentration level detection capability, the nanocomposite-modified electrode is suitable to be used for the detection of UA in human body fluids, such as sweat, urine, or blood. Thus, in the future, it could potentially realize a UA screening test alternative with excellent selectivity and sensitivity.

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