Fe-codoped carbon dots serving as aperoxidase mimicto generate in situ hydrogen peroxide for the visual detection of glucose.

Abstract

Nanozyme technology has gained significant regard and beensuccessfully implemented in various applications including chemical sensing, bio-medicine, and environmental monitoring. Fe-CDs were synthesized and characterized well in this study. As compared to HRP (3.7mM), the Fe-CDs exhibited a higher affinity towards H2O2 (0.2mM) using the steady-state kinetic assay and stronger catalytic capability by changing the color of TMB to the blue color of theoxidizedstate, oxTMB. Additionally, an efficient peroxidase mimic, Fe-CDs/GOx, based on the hybrid cascade system to produce in situ H2O2 for the visual detection of glucose (color change: colorless to blue, and then to green), has been developed in detail, with limits of detection (LODs) for H2O2 and glucose of 0.33μM and 1.17μM, respectively. The changes further demonstrate a linear relationship between absorbance and H2O2 concentration, ranging from 10 to 60μM, and for glucose (1 to 60μM). To assess the accuracy and detection capability of the Fe-CDs/GOx system, we evaluated a real human serum sample obtained from adult males in a local hospital. In conclusion, Fe-CDs serving as a peroxidase mimichave the potential for various applications in the fields of biomedicine and nanozymes.