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Solid-phase micro-extraction coating prepared on basis of polydopamine modified stainless steel wires and preparation method and application thereof

A stainless steel wire, polydopamine technology, applied in chemical instruments and methods, other chemical processes, material separation, etc., can solve problems such as difficulty in controlling coating thickness, and achieve long service life, good preparation reproducibility, and low price. Effect

Inactive Publication Date: 2012-06-13
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems that good adsorption materials such as poly(methacrylic acid-ethylene glycol dimethacrylate) are difficult to be prepared as solid-phase microextraction fiber coatings on stainless steel wires and difficult to control the coating thickness, the present invention provides A preparation method of solid-phase microextraction coating based on polydopamine-modified stainless steel wire and its preparation method and application. The material is chemically bonded with polydopamine on the surface of stainless steel wire as a preparation method of solid-phase microextraction coating, and The capillary acts as a mold to control the thickness of the coating and improve the reproducibility of the preparation

Method used

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  • Solid-phase micro-extraction coating prepared on basis of polydopamine modified stainless steel wires and preparation method and application thereof
  • Solid-phase micro-extraction coating prepared on basis of polydopamine modified stainless steel wires and preparation method and application thereof
  • Solid-phase micro-extraction coating prepared on basis of polydopamine modified stainless steel wires and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) After polishing and cleaning the front end 1cm-2cm of a stainless steel wire with a diameter of 0.22mm and a length of 10cm, soak it in 10 mL of 10 mmol / L Tris buffer solution containing 20 mg of dopamine, and adjust its pH to 8.5. After 20 hours, the stainless steel wire Take out the wire, rinse the front end with deionized water, and use N 2 blow dry.

[0029] (2) Take 40mmol of ethyl acetate, 1mmol of methacrylic acid, 4mmol of ethylene glycol dimethacrylate and 1mmol of azobisisobutyronitrile in a centrifuge tube and mix them evenly. 2 Oxygen was removed for 10 minutes.

[0030] (3) After cleaning, a quartz capillary with an inner diameter of 0.25 mm and a length of 5 cm was inserted into the above-mentioned pre-polymerization solution. Due to capillary action, the pre-polymerization solution filled the capillary, and then the polydopamine-modified stainless steel wire was inserted into the capillary, and immediately Seal both ends of the capillary with a rubb...

Embodiment 2

[0042] The basic operation is the same as in Example 1, but the pre-polymerization solution is a mixed solvent of 20mmol ethyl acetate, 2mmol methacrylic acid, 1mmol ethylene glycol dimethacrylate and 2mmol azobisisobutyronitrile. The rest of the treatments are the same.

Embodiment 3

[0044] The basic operation is the same as in Example 1, but the pre-polymerization solution is a mixed solvent of 30mmol ethyl acetate, 1.6mmol methacrylic acid, 2mmol ethylene glycol dimethacrylate and 1.6mmol azobisisobutyronitrile. The rest of the treatments are the same.

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Abstract

The invention discloses a solid-phase micro-extraction coating prepared on the basis of polydopamine modified stainless steel wires and a preparation method and application thereof, which belong to the field of analytical chemistry. The preparation method includes steps of utilizing stainless steel wires which are modified by polydopamine as a solid-phase micro-extraction fiber matrix and utilizing quartz capillary tubes as moulds, and finally forming the solid-phase micro-extraction coating after methacrylic acid and ethylene glycol dimethacrylate are subjected to in-situ polymerization in the capillary tubes and then react with polydopamine so as to be bonded on the surfaces of the stainless steel wires. The solid-phase micro-extraction coating prepared on the basis of polydopamine modified stainless steel wires is applied to pretreatment of analysis of chlorophenols and polychlorinated biphenyls. Mechanical strength is enhanced due to the fact that the stainless steel wires are used as the matrix. The coating is not easy to shed off the surfaces of the stainless steel and is long in service life. Due to the capillary tubes serving as the moulds, the coating is uniform in thickness, fine in reproducibility and low in cost. On the optimum extraction condition, the coating has low limit of detection to four types of chlorophenols and six types of polychlorinated biphenyls and meets requirements of trace analysis.

Description

Technical field [0001] The present invention involves a method and application of the use of stainless steel wire as a solid -phase extraction fiber -based system, and the application of solid -phase extraction coating, which involves a polydamine -based modifiers of stainless steel wire preparation and the preparation methods and applications and applications and applications and applications.Essence Background technique [0002] Solid-Phase MicroExtraction (SPME) technology is a research team developed by Professor Pawliszyn in the University of Waterloo in 1989 based on solid-phase extract.Since its inception in the early 1990s, SPME development has matured. Because it has the advantages of small samples, convenient operations, fast operation, etc., and it is easy to have gas chromatography (GC), high -efficiency liquid chromatography (HPLC), and capillary electrophoresis (CE)., Gas chromatography-mass spectrometer (GC-MS) and other common chromatography instruments, which is ...

Claims

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Application Information

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IPC IPC(8): B01J20/286B01J20/30B01D15/08G01N30/06
Inventor 孙成李文超高占啟彭英何欢杨绍贵胡冠九张宁红
Owner NANJING UNIV
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