Abstract

Comprehensive SummaryImbalance in the levels of ascorbic acid (AA) can pose a risk to human health. Therefore, it's essential to establish an accurate method for the detection of AA. In this work, a novel N‐doped carbon composite (MnOx@NC) with dual enzyme‐like activities to detect AA was prepared by calcination of Mn‐MOF containing H3TTPCA ligand. Interestingly, the •O2− that leads to its oxidase‐like activity was not formed by dissolved oxygen, but came from the synergistic effect of lattice oxygen generated by calcination and the transformation of MnII/MnIII/MnIV, and the presence of H2O2 provided much •OH, which caused its peroxidase‐like activity. Meanwhile, the residual N element came from H3TTPCA ligand assisted the catalytic process. Accordingly, a dual‐signal sensing platform and smartphone‐assisted recognition for detection of AA was developed and a colorimetric sensor array was established to distinguish three antioxidants. This work also demonstrates considerable promise for the detection of AA in authentic pharmaceuticals.

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