期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 348, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2022.112401
关键词
Covalent organic framework; Water sensing; Ratiometric sensor; Food products; Milk powder
The sensitive detection of trace water in solid food products is crucial for maintaining their stability and quality. A novel crystalline COF TAPT-BPTA with fluorescence was developed for this purpose, which can be quenched by trace water due to disruption of the intermolecular charge transfer process. The COF TAPT-BPTA demonstrated rapid response and wide sensing ranges in various organic solvents. It was also successfully used in a ratiometric fluorescent sensor for detecting trace water in milk powder samples.
The sensitive and accurate detection of trace water in solid food products is of great significance for the pro-tection of their stability and quality. Herein, a novel crystalline COF TAPT-BPTA with fluorescence was prepared via Schiff-base condensation reaction between 4,4 ',4 ''-(1,3,5-Triazine-2,4,6-triyl)trianiline (TAPT) and 2,5-bis(2-propyn-1-yloxy)-1,4-benzenedicarboxaldehyde (BPTA). The fluorescence of TAPT-BPTA was sensitive to trace water and can be quenched due to the disruption of intermolecular charge transfer (ICT) process by water molecules. Hence, COF TAPT-BPTA was successfully applied for sensing of trace water in common organic solvents including acetone, acetonitrile, THF and DMF with rapid response (less than 3 s) and good sensing ranges (0.05-20 v/v% for acetone, 0.10-25 v/v% for THF, 0.05-15 v/v% for ACN, and 0.05-10 v/v% for DMF). The limit of detection of water in acetone, ACN, DMF, THF were 0.0585%, 0.0631%, 0.0185% and 0.0718% (v/ v), respectively. Additionally, using TAPT-BPTA as signal probe and tris(2,2 '-bipyridyl)ruthenium (II) dichloride with red fluorescent as reference, a ratiometric fluorescent sensor was prepared and successfully used for the sensing of trace water in milk powder samples.
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