首页|Electrochemical determination of glucose in blood serum and sweat samples by the strontium doped Co3O4
Electrochemical determination of glucose in blood serum and sweat samples by the strontium doped Co3O4
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NSTL
Elsevier
This work reports the noninvasive electrochemical determination of glucose by strontium doped cobaltic cobalt oxide nanostructures (Sr-Co3O4). The Sr-Co3O4 is prepared by three conventional methods namely hydrothermal, magnetic stirring, and ultrasound. Among all, the hydrothermal method effectively incorporated the Sr in the Co3O4 lattice. The Sr percentage and Co oxidation states were investigated by x-ray photoelectron spectroscopy. The Sr has a more ionic radius than cobalt, therefore, it is occupied in the octahedral site. As a result, the non-stoichiometric oxygen content was increased in the Co3O4 lattices, which are the main contributor to the electrochemical determination of glucose. The results revealed that hydrothermally synthesized Sr-Co3O4 (HSC) exhibited improved electrocatalytic activity such as low peak potential (0.55 V) and high current (116 mu A) towards glucose oxidation than the other electrocatalysts. The HSC/GCE revealed a good sensitivity (9.01 +/- 0.15 mu A mM(-1) cm(-2)) and low LoD (31 +/- 3 nM). Also, high selectivity was observed towards glucose detection in the presence of co-interfering species. Moreover, the Sr-Co3O4 is applied in real-time monitoring of glucose in blood serum and sweat samples which received good recoveries.
NSTL
Elsevier
