Abstract
AbstractWe report the simultaneous determination of purine molecules with biological significance on pencil graphite electrode (PGE) modified with a composite solution including NiO nanoparticles, multi‐walled carbon nanotube (MWCNT), and natural nano‐Na‐montmorillonite clay (NNaM) using DPV technique. The novel sensor, NiO/MWCNT/NNaM/PGE, achieved simultaneous determination of xanthine, theophylline, and theobromine at the detection limits 0.077 μM, 0.361 μM, and 0.458 μM with the linear working ranges 0.5–150 μM, 5–200 μM, and 5–250 μM in Britton‐Robinson buffer at pH 2.0, respectively. The sensor revealed excellent performance for the simultaneous determination of XT, TP, and TB in three real‐world samples.
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