Preparation method of solid-phase microextraction fibers by bonding metal wire with polyion liquid

Abstract

The invention discloses a method for preparing solid-phase microextraction fibers with a polyion liquid bonding coating on a metal wire carrier, particularly relates to a preparation method by utilizing a surface-initiated atom transfer radical polymerization reaction to graft an ionic liquid on the metal wire in a situ polymerizing manner. The novel method is characterized in that the method comprises the steps of adopting the metal wire as the carrier, performing chemical silvering on the surface of the metal wire firstly, then performing hydroxylation on the silvered layer, bonding an atom transfer radical polymerization initiation site, and preparing the polyion liquid bonding coating on the surface of the metal wire with the ionic liquid containing alkenyl as a monomer by utilizing the surface-initiated atom transfer radical polymerization technology. The solid-phase microextraction fibers prepared by the preparation method disclosed by the invention have the advantages of high mechanical strength, good coating stability, good extraction property and the like, can be used for enrichment analysis of trace components of samples of food, environment, drugs and biochemistry and the like, and are very good in application potential.

Description

technical field [0001] The invention relates to a technology for preparing solid-phase micro-extraction fibers with polyionic liquid bonding coatings on metal wire carriers. Background technique [0002] Solid-phase microextraction (SPME) is a new sample pretreatment technology developed in the 1990s that integrates sampling, enrichment, purification, and analysis. It has been widely used in the fields of environment, food, medicine and biological analysis. The commonly referred to SPME refers to fiber solid phase microextraction, and the core is the preparation of extracted fibers. The stability and extraction properties of the extracted fibers depend on the carrier and the extraction coating. Quartz is a common carrier for preparing solid-phase microextraction fibers. The mechanical properties of quartz are poor, and it is easy to break during operation, which seriously affects the service life of the extraction fibers. In order to improve the mechanical strength of SPE...

AI Technical Summary

Problems solved by technology

The initial research was to use free ionic liquids as coatings, but the loss of ionic liquids resulted in low sensitivity and poor reproducibility, etc.

Later, it was reported that polymerized ionic liquids were physically coated on quartz carriers to prepare solid-phase microextraction fibers, which improved thermal stability and reproducibility to a certain extent, but because there was no chemical bonding between the coating and the carrier, the ionic liquids could not be fundamentally eliminated. loss of coating

Then came the ionic liquid bonded quartz fiber, which can overcome the loss of coating, but the quartz carrier is easily broken, which seriously affects the service life of the extraction fiber, and the low bonding amount of the single molecule of the ionic liquid makes the extraction capacity small, while the polyionic liquid However, it is difficult to effectively control the amount of bonding, which makes the reproducibility of the preparation poor.

Images