In this paper, a novel metal-free 2(3),9(10),16(17), 23(24)-octamethoxyphthalocyanine (Pc(OH) 8 ) has been first used to modify CoSn(OH) 6 nanocubes to obtain the Pc(OH) 8 /CoSn(OH) 6 nanocomposites, which possess the enhanced peroxidase-like performances, compared with that of pure CoSn(OH) 6 . Pc(OH) 8 / CoSn(OH) 6 can rapidly accelerate the process of catalytic oxidation of the chromogenic substrate 3,3′,5,5′-tetramethylbenzidine (TMB) by H 2 O 2 in 2 min. The peroxidase-like performance of Pc(OH) 8 / CoSn(OH) 6 is consistent with the Michaelis−Menten kinetics. The catalytic mechanism of Pc(OH) 8 /CoSn(OH) 6 from the generated active species (•OH and •O 2 − ) in the catalytic system has been comprehensively investigated by florescent probe and radical quencher experiments. Based on this, a fast colorimetric sensing platform for H 2 O 2 detection and cholesterol is constructed in the range of 0.4−0.8 mM and 0.1−0.9 mM with a limit of detection (LOD) of 0.0914 mM and 10.7 μM. The contents of total cholesterol in serum samples is monitored satisfactorily and distinguished visually.

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The increase of the peroxidase-like activity of nanozymes is an important precondition for constructing real-time sensing platforms. In this work, the synthesized bimetal MIL-101(Fe/Co) nano-polyhedrons exhibit the much higher peroxidase-like...

Constructing of sensing platform based on nanoenzymes has been focused by scientists from the different countries. Due to Phosphate ion (Pi) is considered as an important indicator for water eutrophication,...

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