Abstract
The disease diabetes mellitus is one of the top-ten causes of death in the world, claiming nearly 1.6 million people per year. Therefore, diagnosis and the monitoring of blood glucose levels are becoming a great concern. Herein, we report a perovskite-type lanthanum cobaltite (LaCoO3) modified electrode as an enzyme-free glucose sensor. The morphological analysis of prepared LaCoO3 was characterized through field emission scanning electron microscopy and transmission electron microscope. The chemical composition and formation of LaCoO3 were analyzed through X-ray diffraction and Raman spectroscopy. In addition, the glucose-sensing property of LaCoO3 was measured using cyclic voltammetry and amperometric-it. In addition, the LaCoO3 modified glass carbon electrode (LaCoO3/GCE) shows an excellent electrochemical activity toward the oxidation of glucose in an alkaline medium (0.1 M NaOH; pH ∼ 13). As a result, the prepared sensor exhibits a wider linear range of 10 nM to 407.2 μM and a very low detection limit of 1.6 nM towards glucose sensing. Finally, the prepared sensor was tested with real samples of human blood and urine and exhibited good found and recoveries values.
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