Abstract
A nonenzymatic electrochemical nanoprobe is described for the fast determination of hydrogen peroxide (H2O2). A sputtered indium tin oxide electrode with a nano-hierarchical 3D gold structure is used. The nanoprobe was characterized by SEM, EDX, TEM, SAED, and electrochemical techniques. Figures of merit include (a) a fast response time (≤ 1.0s), (b) two linear dynamic ranges that extend from 10-12M to 10-10M and from 10-10M to10-5 M; and (c) a low limit of detection of 9.8 × 10-13M. The nanoprobe works in the clinical range and was applied for trace analysis of H2O2 in spiked blood samples, and recoveries ranged between 90 and 96%. It has negligible response (p< 0.001, for n= 3) toward glucose, citric acid, ascorbic acid, uric acid, glycine, and alanine. The shelf-lifetime is found to be 12weeks. Graphical abstract Schematic representation of a dendritic nanochip with peroxidase-like activity. It is made from an indium tin oxide electrode with a nanohierarchical gold structure and was used for amperometric determination of hydrogen peroxide.
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