Engineering of 2D artificial nanozyme-based blocking effect-triggered colorimetric sensor for onsite visual assay of residual tetracycline in milk

Recent advances in colorimetric sensors based on nanozymes with peroxidase-like activity

“…Z. et al introduced Cu 2+ into g-C 3 N 4 to fabricate Cu-doped-g-C 3 N 4 nanocomposite-based nanozymes for evaluating residual antibiotics in food and agriculture-related matrices. 134 Due to the synergistic coordination arising from abundant Cu 2+ and g-C 3 N 4 nanosheets, Cu-doped-g-C 3 N 4 nanocomposite-based nanozymes exhibited impressive peroxidase-mimicking activity. As expected, it displayed a high affinity for catalyzing colorless TMB-H 2 O 2 to generate a steel-blue oxTMB product.…”

Nanomaterials for molecular recognition: specific adsorption and regulation of nanozyme activities

“…5D). Shen et al 19 employed the Cu-g-C 3 N 4 nanozyme for the specific identification of tetracycline (TC) residues in milk. As shown in Fig.…”

“…For instance, the specific recognition of tetracycline (TC) by the Cu-g-C 3 N 4 nanozyme was achieved by inhibiting the catalytic ability of the Cu-g-C 3 N 4 nanozyme. 19 In addition, the interaction between targets and MOFs may lead a Key Laboratory of Resource Biology and Biotechnology in Western China (Ministry to the enhancement or quenching of MOF fluorescence for target recognition. Moreover, a few metal oxides also exhibit unique molecular recognition properties.…”

Dual-Modal Bimetallic Nanozyme-Based Sensing Platform Combining Colorimetric and Photothermal Signal Cascade Catalytic Enhancement for Detection of Hypoxanthine to Judge Meat Freshness

“…It is known that a majority of artificial peroxidase-like nanozymes show more economical and robust catalytic activity than natural enzymes, which has exhibited great potential in developing efficient analytical techniques for food quality and safety analysis. − However, most of the peroxidase mimic-based assays usually required directly added H 2 O 2 to act as a coreactant for generating reactive oxygen species (ROS, e.g., • OH), thereby oxidizing the substrates to produce analytical signals for reporting the levels of targets. , Nevertheless, the poor stability of H 2 O 2 limits its practical application in onsite food quality and safety analysis. On this background, the self-supplying H 2 O 2 -facilitated cascade catalytic analytical system, which involves natural enzyme-assisted peroxidase-like nanozymes, has become a very promising way to improve the analytical stability of assays. , Recently, the unique light-to-heat photophysical conversion feature has exhibited great potential in developing a portable and low-cost visual sensing platform .…”

“…• OH), thereby oxidizing the substrates to produce analytical signals for reporting the levels of targets. 20,21 Nevertheless, the poor stability of H 2 O 2 limits its practical application in onsite food quality and safety analysis. On this background, the selfsupplying H 2 O 2 -facilitated cascade catalytic analytical system, which involves natural enzyme-assisted peroxidase-like nanozymes, has become a very promising way to improve the analytical stability of assays.…”