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Preparation method for solid phase microextraction recognizable adsorption coating

A recognition and coating technology, applied in the field of sample pretreatment in analytical chemistry, can solve problems such as interference, and achieve the effect of improving the ability to identify adsorption, improve the ability to identify adsorption, and increase the thickness

Inactive Publication Date: 2013-05-01
MINNAN NORMAL UNIV
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  • Application Information

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Problems solved by technology

At present, most of the SPME extraction heads have no selectivity for the adsorption of sample components, and only perform adsorption and extraction according to the principle of polar and non-polar "similar compatibility", which makes SPME suitable for extracting the measured components and components in complex environmental samples. It is inevitable to encounter interference from other matrices in the subsequent analysis process.

Method used

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  • Preparation method for solid phase microextraction recognizable adsorption coating
  • Preparation method for solid phase microextraction recognizable adsorption coating
  • Preparation method for solid phase microextraction recognizable adsorption coating

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preparation example Construction

[0031] Cooperate figure 1 , 2 As shown, the present invention discloses a layer-by-layer alternating structure SiO 2 / Preparation method of carbon nanotube-supported molecularly imprinted membrane (CNTs-MIP) solid-phase microextraction adsorption coating, the specific contents include:

[0032] Step 1. Pretreatment of supporting stainless steel wire

[0033] The 1.5 cm end of the supporting stainless steel wire fiber was corroded with hydrofluoric acid for 3 h, and then washed with deionized water, methanol, acetone, and chloroform in sequence, and left to dry at room temperature.

[0034] Step 2. Activation of carbon nanotubes (CNTs)

[0035] Add CNTs to the mixed solution of concentrated sulfuric acid and concentrated nitric acid ( V : V =3:1), ultrasonically disperse and acidify at 70°C for 3 h, so that the CNTs can be charged with -OH, -COOH, -CH 3 Such activated groups are beneficial to the coating of organic polymers.

[0036] Step 3, SiO 2 Preparation of sol so...

Embodiment

[0045] Embodiment (dimethyl phthalate layer alternating structure SiO 2 / Preparation and application of SPME recognition adsorption coating of CNTs-MIP)

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Abstract

The invention discloses a preparation method for a solid phase microextraction recognizable adsorption coating, comprising the steps that a support stainless steel wire is pretreated, carbon nanotubes (CNTs) are activated, a SiO2 sol solution is prepared, CNTs-MIP (molecularly imprinted polymer) polymer dope is prepared, a fiber tip of the treated stainless steel wire is vertically soaked into the SiO2 sol solution and is irradiated under an ultraviolet lamp for 30 min after being taken out, and a SiO2 coating is prepared; the fiber tip is then soaked into the CNTs-MIP polymer dope and is irradiated under the ultraviolet lamp for 30 min after being taken out, and a CNTs-MIP coating is prepared; the operations are carried repeatedly and alternately until the thickness of the coatings reaches 20-50 mu.m; and the prepared coatings are placed at a gas chromatography injection port and aged in the nitrogen condition at the temperature of 300 DEG C until no template molecules are detected in a chromatogram, namely an SPME recognizable adsorption coating of SiO2 / CNTs-MIP, having good recognition and extracting power towards a target substance, is obtained.

Description

technical field [0001] The invention belongs to the sample pretreatment technology in analytical chemistry, in particular to the preparation method of the adsorption coating in the solid phase microextraction technology, which is suitable for the identification separation and enrichment of trace substances in samples such as environment, food, medicine and biology. Background technique [0002] In 1990, Solid Phase Microextraction (Solid Phase Microextraction, SPME) proposed by Pawliszyn of the University of Waterloo in Canada attracted the attention of the world. This method is a new sample pretreatment technology integrating sampling, extraction, concentration, desorption and sample injection. It is one of the sample pretreatment methods with great development potential due to its advantages of simplicity, rapidity, high sensitivity, small amount of sample required, and no secondary pollution. At present, most of the SPME extraction heads have no selectivity for the adsorp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/32
Inventor 张茂升
Owner MINNAN NORMAL UNIV
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