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An Electrochemical Sensor Based on Magnetic Nanoparticle Modified Electrode

A magnetic nanoparticle and nanomagnetic particle technology, applied in the field of electrochemical sensor and its preparation of magnetic nanoparticle modified electrode, to achieve the effect of simple production, sensitive concentration response and high sensitivity

Active Publication Date: 2016-08-24
嘉兴云泽科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on electrochemical sensors for the determination of AA content using functionalized magnetic nanoparticles modified electrodes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A preparation method of an electrochemical sensor based on a magnetic nanoparticle modified electrode, the steps are as follows:

[0016] (1) Preparation of polypyrrole sodium p-toluenesulfonate (NaTSA-PPy): add 1g pyrrole (Py) and 200mL deionized water in a three-necked flask, stir well to obtain a uniform emulsion, add 1.5g p-toluenesulfonic acid Sodium (NaTSA) was stirred, and the stirring speed was controlled to be 350r / min. After pyrrole and p-toluenesulfonic acid were mixed uniformly, 1.5 g of ferric trichloride hydrate (FeCl 3 ·6H 2 O), reacted for 36h at 0-4°C. Rinse repeatedly with methanol and distilled water, and dry in vacuum at 69°C for 9 hours to obtain polypyrrole sodium p-toluenesulfonate (NaTSA-PPy);

[0017] (2) Preparation of nano-magnetic particles: Add 1 g of polypyrrole sodium p-toluenesulfonate to 200 mL of deionized water, mix ultrasonically for 25 min, add 1 g of ferrous chloride hydrate (FeCl 2 4H 2 O), then add 25% ammonia water (NH 3 ·H...

Embodiment 2

[0021] A method for preparing an electrochemical sensor based on a magnetic nanoparticle modified electrode, the steps are as follows:

[0022] (1) Preparation of polypyrrole sodium p-toluenesulfonate (NaTSA-PPy): Add 1g pyrrole (Py) and 100mL deionized water in a three-necked flask, stir well to obtain a uniform emulsion, add 1g sodium p-toluenesulfonate ( NaTSA) stirring, the control stirring speed is 200r / min. After the pyrrole and p-toluenesulfonic acid were mixed uniformly, 1 g of ferric trichloride hydrate (FeCl 3 ·6H 2 O), reacted at 0°C for 48h; rinsed repeatedly with methanol and distilled water, and vacuum-dried at 60°C for 12h to obtain polypyrrole sodium p-toluenesulfonate (NaTSA-PPy);

[0023] (2) Preparation of nano-magnetic particles: Add 1 g of polypyrrole sodium p-toluenesulfonate to 100 mL of deionized water, mix ultrasonically for 15 min, add 1 g of ferrous chloride hydrate (FeCl 2 4H 2 O), then add 25% ammonia water (NH 3 ·H 2 (2) 4mL, stirred at a sp...

Embodiment 3

[0027] A method for preparing an electrochemical sensor based on a magnetic nanoparticle modified electrode, the steps are as follows:

[0028] (1) Preparation of polypyrrole sodium p-toluenesulfonate (NaTSA-PPy): add 1g pyrrole (Py) and 300mL deionized water in a three-necked flask, stir fully to obtain a uniform emulsion, add 2g sodium p-toluenesulfonate ( NaTSA) stirring, the stirring speed is controlled at 200-500r / min; after pyrrole and p-toluenesulfonic acid are mixed evenly, add ferric trichloride hydrate (FeCl 3 ·6H 2 (0), react at 4°C for 24h; rinse repeatedly with methanol and distilled water, and dry in vacuum at 75°C for 8h to obtain polypyrrole sodium p-toluenesulfonate (NaTSA-PPy);

[0029] (2) Preparation of nano-magnetic particles: Add 1 g of polypyrrole sodium p-toluenesulfonate to 300 mL of deionized water, mix ultrasonically for 30 min, add 1 g of ferrous chloride hydrate (FeCl 2 4H 2 O), then add 25% ammonia water (NH 3 ·H 2 (2) 12mL, stirred at a spee...

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Abstract

The invention relates to an electrochemical sensor based on magnetic nano-particle modified electrodes and a preparation method thereof. The method comprises preparing ferroferric oxide / paratoluene sulfonic acid sodium salt spolypyrrole (NaTSA-PPy) with NaTSA-PPy and magnetic nano-particles, coating the ferroferric oxide / NaTSA-PPy onto the surfaces of glass carbon electrodes to obtain the magnetic nano-particle modified electrodes (Fe3O4 / NaTSA-PPy / GC, and structuring the electrochemical sensor through the Fe3O4 / NaTSA-PPy / GC for detection of ascorbic acid. The Fe3O4 / NaTSA-PPy / GC electrochemical sensor is sensitive in concentration response and can accurately measure out the content of the ascorbic acid inside medium; meanwhile, the modified layers of the electrodes are not easy to fall off, high in detecting stability and wide in detecting range.

Description

technical field [0001] The invention relates to the field of electrochemical sensors, in particular to an electrochemical sensor based on a functionalized magnetic nanoparticle modified electrode and a preparation method thereof. Background technique [0002] Ascorbic acid (AA) is a naturally occurring organic compound with antioxidant properties, a form of vitamin C (vitaminoid), and one of the important vitamins for maintaining normal physiological functions of the body. and other complex metabolic processes. Ascorbic acid is often added to food and medicine as an antioxidant and nutritional enhancer. In addition, ascorbic acid can also react with the reaction products of antioxidants to regenerate oxidants, so ascorbic acid is also an important synergist of antioxidants. Fresh fruits and vegetables are rich in ascorbic acid, especially oranges, tangerines, tomatoes, fresh dates and pine needles. So ascorbic acid is a very important nutritional indicator in fruits and v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30
Inventor 孙京华潘正海
Owner 嘉兴云泽科技有限公司
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