Heteropore covalent organic framework-based composite membrane prepared by in situ growth on non-woven fabric for sample pretreatment of food non-targeted analysis

Wang, XH (Wang, Xiao-han) 1Li, W (Li, Wei) 1Jiang, HX (Jiang, Hong-xin) 2Chen, Y (Chen, Yan) 1Gao, RZ (Gao, Rong-zhi) 1Tang, AN (Tang, An-na) 1Kong, DM (Kong, De-ming) 1

MICROCHIMICA ACTA, 2021, 188(7): Article Number 235

DOI 10.1007/s00604-021-04889-9

Abstract

A heteropore covalent organic framework (COF)-based composite membrane material was prepared and proved to have a satisfactory effect on the pretreatment of vegetable samples. The composite membrane was fabricated by in situ growth of a dual-pore COF on the surface of polydopamine (PDA)-aminated non-woven (NW) fabric. Due to the difference in the strength of the interaction between the phytochromes/COF and the pesticides/COF, the removal of phytochromes and the recovery of pesticides can be achieved by adjusting the composition of the solution. Through a simple immersion or filtration operation, NW@PDA@COF composite membrane can quickly and almost completely remove interfering phytochromes in the samples. The recovery of pesticides was determined by HPLC-MS/MS, and the recovery efficiencies were 72.3 similar to 101.7% and 67.3 similar to 106.7% for immersion and filtration modes of five different vegetable samples, respectively; the RSD is between 1.1 and 19% (n = 3). The limits of detection and quantification for the 13 pesticides investigated were 0.08 mu g center dot L-1 and 0.23 mu g center dot L-1, respectively. A wide linear range of 1 similar to 1000 mu g center dot L-1 was observed with R-2 values from 0.9774 to 0.9998. The membrane can be repeatedly used for at least 10 times by using a facile elution treatment. Compared to other commonly used sample pretreatment materials, heteropore COF-based composite membrane is superior in terms of sorbent amount, treatment time, operation simplicity, and material reusability.