Title:	ZnO−Co3O4 Nanofibers/MXene Composite with Peroxidase-Like Activity for Ascorbic Acid Detection.
Authors:	FACURE, M. H. M. MERCANTE, L. A. GOGOTSI, Y. CORREA, D. S.
Affiliation:	FEDERAL UNIVERSITY OF SAO CARLOS; INSTITUTE OF CHEMISTRY, FEDERAL UNIVERSITY OF BAHIA (UFBA); DEPARTMENT OF MATERIALS SCIENCE AND ENGINEERING, DREXEL UNIVERSITY; DANIEL SOUZA CORREA, CNPDIA.
Date Issued:	2025
Citation:	ACS Applied Nano Materials, v. 8, 2025.
Pages:	4291−4299
Description:	The growing concern about nutrient-rich diets and health monitoring has motivated the search for simple, fast, and effective methods for detecting important nutrients in foodstuffs. In this scenario, colorimetric detection using nanostructures presenting enzymatic properties (nanozymes) has gained prominence due to its experimental simplicity and low cost. In this work, zinc oxide−cobalt oxide electrospun nanofibers (ZnO−Co3O4 NFs) were combined with titanium carbide (Ti3C2Tx) MXene for the colorimetric detection of ascorbic acid. The nanocomposite (ZnO−Co3O4 NFs/Ti3C2Tx) presented peroxidase-like activity with a high affinity for the chromogenic substrate 3,3,5,5- tetramethylbenzidine and fast reaction kinetics. Taking advantage of the catalytic properties of the developed nanocomposite, ascorbic acid was detected with high sensitivity (the limit of detection was 0.58 μmol L−1 ) and selectivity, even in the presence of common interferents. The colorimetric sensor even detected ascorbic acid in orange juice, revealing its potential to be used as a reliable and sensitive portable method for food analysis.
Keywords:	Nanozyme Colorimetric sensor Peroxidase-mimetic activity Titanium carbide MXene Electrospun nanofibers
DOI:	https://doi.org/10.1021/acsanm.4c00539
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPDIA)