Colorimetric sensor arrays for antioxidant recognition based on Co₃O₄ dual-enzyme activities

Abstract

A sensor array based on the double enzyme–like activity of Co3O4 nanozymes was constructed to identify four different antioxidants. Due to the double enzyme–like activity of Co3O4, oxTMB appears blue with different degrees in the presence and absence of H2O2.

In Situ Conversion of MnO Nanoparticles with Excellent Oxidase-like Activity in Building a Fluorescence Sensing Platform for Cysteine and Cu2+ Sequential Detection

“…So far, many strategies have been developed for Cys and Cu 2+ detection, such as high-performance liquid chromatography (HPLC), , capillary electrophoresis, , electrochemistry, , gas chromatography, atomic emission/absorption spectrometry (AES/AAS), , surface plasmon resonance (SPR), colorimetric method, , and fluorometric method. − However, most of these methods suffer from expensive instruments and sophisticated operation; moreover, these methods detect Cys and Cu 2+ separately, thus needing different technologies and instruments, making it more complicated and time-consuming. In fact, there lies a strong interaction between Cys and Cu 2+ , , which makes it rational to build a sensing platform for their simultaneous detection in the same process, with the aim to shorten the detection time and simplify the measurement process.…”

“…4 Hence, it is also of great significance to accurately detect Cu 2+ in environmental or physiological conditions. So far, many strategies have been developed for Cys and Cu 2+ detection, such as high-performance liquid chromatography (HPLC), 5,6 capillary electrophoresis, 7,8 electrochemistry, 9,10 gas chromatography, 11 atomic emission/absorption spectrometry (AES/AAS), 12,13 surface plasmon resonance (SPR), 14 colorimetric method, 15,16 and fluorometric method. 17−19 However, most of these methods suffer from expensive instruments and sophisticated operation; moreover, these methods detect Cys and Cu 2+ separately, thus needing different technologies and instruments, making it more complicated and time-consuming.…”