Journal
FOOD CHEMISTRY
Volume 393, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2022.133386
Keywords
Ag/FeS2; Peroxidase-like activity; H2O2; Non-enzymatic assay; Colorimetric assay
Funding
- National Natural Science Foundation of China [21575064]
- Jiangsu Key Laboratory of Molecular Biology for Skin Diseases and STIs
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In this study, Ag/FeS2 nanocomposites were prepared via an in-situ photocatalytic reduction approach, which exhibited excellent catalytic activity and detection performance in electrochemical sensors for the effective quantification of H(2)O(2).
Ag nanoparticles (Ag NPs) with high electrocatalytic activity are of great significance for electrochemical sensors. Nanostructures as scaffold can solve aggregation problem of Ag NPs so that to ensure the stability. In this work, Ag NPs immobilized on FeS2 nanoprisms (Ag/FeS2) were prepared via an in-situ photocatalytic reduction approach. The enlarged electrode effective surface area, enhanced electron transfer and the synergic impact between Ag NPs and FeS2 lead to an enhanced catalytic activity. The electrochemical detection method exhibited great performance of low detection limit (0.6 mu M), wide linear range and high sensitivity (244.4 mu A mM(-1) cm(-2)) for H2O2. Moreover, Ag/FeS2 as a peroxidase mimic can catalyze oxidation of colorless 3,3',5,5'-tetrame-thylbenzidine (TMB) to blue product (oxTMB) by H2O2, which achieved effective detection of H(2)O(2 )with a 3.0 mu M detection limit. A promising way was successfully eatablished to perform the quantitation of H(2)O(2 )in serum and beverage.
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