Tetrazole-Containing Triphenylamine-Based MOF as a Sensitive Sensor for Food Inspection

Abstract

A new metal–organic framework (MOF) with tetrazole-derived triphenylamine (TPA) as the ligand, namely Mn–TPA, has been successfully prepared and thoroughly characterized via thermogravimetric analysis, IR spectroscopy, elemental analysis, UV–vis absorption, fluorescence analysis, bond valence sum calculations, and single-crystal and powder X-ray diffraction analysis. The undulating monolayer of Mn–TPA can hinder the interaction and tight stacking among analytes, which creates a bionic microenvironment for the electrochemical recognition process. Mn–TPA exhibits high specific surface area, stable film-forming capacity, excellent electrochemical activity, and good biocompatibility. Furthermore, the developed Mn–TPA-based immunosensing system exhibits an excellent limit of detection of 0.50 pg·mL–1 toward vomitoxin, which is more outstanding than that of the reported vomitoxin-sensing system. Thus, this work shows the great potential of a well-designed MOF as an easy-to-make and highly sensitive electrochemical platform for biosensing in food safety detection and other fields.

“On–On–Off” Recyclable Fluorescence Battery for Direct and Selective Detection of Glyphosate and Cu2+

“…17,18 MOFs have excellent advantages, such as ease of synthesis, adjustable optical properties, excellent stability, and low cost. 19 safety, 20,21 environmental protection, 22,23 and early cancer diagnosis. 24−26 For this reason, developing OP detection sensors with MOF nanomaterials is prospective.…”

“…Nowadays, fluorescence nanomaterials, such as quantum dots (QDs), covalent organic frameworks, and metal–organic frameworks (MOFs), are receiving considerable attention and are widely used to develop fluorescence sensors, owing to the surface plentiful active sites, high biocompatibility, and excellent structure stability. , MOFs have excellent advantages, such as ease of synthesis, adjustable optical properties, excellent stability, and low cost . Various MOF nanomaterials have been successfully utilized in different fields, such as food safety, , environmental protection, , and early cancer diagnosis. − For this reason, developing OP detection sensors with MOF nanomaterials is prospective. Some groups have used functioned MOFs to detect OPs; for example, Li et al designed a chemiluminescence sensor to detect glyphosate (Gly) via an alkali solution treating UIO-66 surface to form a hydroxy zirconium oxide nanozyme (ZrOX-OH) .…”

A Stable Triphenylamine-Based Zn(II)-MOF for Photocatalytic H2 Evolution and Photooxidative Carbon–Carbon Coupling Reaction

“…With the excessive consumption of fossil fuels, environmental pollution and energy shortages have become the two major challenges facing society today. , Solar-driven photocatalysis as a green, safe, and mild technology has been considered to be one of the most promising approaches to address the environmental and energy concerns. − To develop environmentally friendly and efficient photocatalysts, triphenylamine and its derivatives (TPAs) have attracted widespread attention and been applied in photocatalytic H 2 evolution, , CO 2 reduction, , organic transformations, , and so on. The low cost, easy availability, and strong photo-redox capability in excited states promote TPAs to be a good alternative to the expensive ruthenium or iridium organometallic photocatalysts. , Meanwhile, compared with the inorganic semiconductor photocatalysts, TPAs also display excellent photoelectric efficiency and more flexible structural adjustability .…”