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Electrochemical sensor for quickly determining sunset yellow, preparation method and application in determining sunset yellow

A rapid measurement and sensor technology, applied in the field of analytical chemistry, can solve the problems of cumbersome steps, difficulty in satisfying rapid determination, time-consuming, etc., and achieve the effect of simple preparation method, good electrocatalytic performance and low cost

Inactive Publication Date: 2017-05-31
XINYANG NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are usually cumbersome and time-consuming, and often require the use of some very expensive large-scale analytical instruments to complete the experimental determination, and also require pretreatment of the measured samples, which is difficult to meet the requirements of rapid determination

Method used

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  • Electrochemical sensor for quickly determining sunset yellow, preparation method and application in determining sunset yellow
  • Electrochemical sensor for quickly determining sunset yellow, preparation method and application in determining sunset yellow
  • Electrochemical sensor for quickly determining sunset yellow, preparation method and application in determining sunset yellow

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Embodiment 1

[0025] 1) Electrode pretreatment

[0026] First, the glassy carbon electrode (GCE, d=3.0mm) was polished on 1800# sandpaper, and then polished with 0.3 μm and 0.05 μm alumina powder and suede to a mirror surface, and then successively polished in absolute ethanol and double distilled water Ultrasonic cleaning in medium for 5 minutes, rinsed with double distilled water, and set aside.

[0027] 2) Preparation of poly-L-aspartic acid modified electrode

[0028] Place the prepared bare glassy carbon electrode in a 0.1mol / L PBS (pH=7.0) solution containing 2mmol / L L-aspartic acid, and conduct a scan at a sweep rate of 100mV / s in the range of -0.8 to 2.0V Cyclic voltammetry scans 15 circles to make a uniform layer of L-aspartic acid film on the surface of the electrode, then rinse the electrode with distilled water and dry it with high-purity nitrogen to obtain poly-L-aspartic acid Modified glassy carbon electrode sensor (L-ASP / GCE).

[0029] 3) Preparation of acetylene black mod...

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Abstract

The invention relates to an electrochemical sensor for quickly determining sunset yellow, a preparation method and an application in determining the sunset yellow. The electrochemical sensor is a glassy carbon electrode modified by a poly L-aspartic acid / acetylene black layer-by-layer assembly material. The particular method comprises the steps of placing an acetylene black modified glassy carbon electrode in 0.1mol / L PBS solution containing 2mmol / L L-aspartic acid and having pH (potential of hydrogen) of 7.0, and performing cyclic voltammetry scanning with a range of -0.8-2.0V at a speed of 100mV / s to prepare the L-ASP / AB / GCE (aspartic acid / acetylene black / glassy carbon electrode). The preparation method of the electrochemical sensor is simple, quick and good in stability; since oxidation peak current of the sunset yellow on the modified electrode can be effectively increased, the electrochemical sensor has a good electron conduction effect on an oxidation reaction of the sunset yellow; the sensitivity of an analytical method is remarkably improved; and in addition, the electrochemical sensor has sensitivity of determining the sunset yellow, is easy to prepare, low in cost and good in repeatability and has better application prospects in a detection aspect of the sunset yellow.

Description

technical field [0001] The invention belongs to the technical field of analytical chemistry, and in particular relates to an electrochemical sensor for rapidly measuring sunset yellow, a preparation method and an application in measuring sunset yellow. Background technique [0002] Sunset yellow is a synthetic food coloring agent approved and allowed to be used in my country. It is also known as sunset yellow and sunset yellow. Disodium sulfonate is a water-soluble organic compound containing benzene ring or xanthene structure. Adding an appropriate amount of sunset yellow to food can not only change the appearance of the food, but also maintain the color of the food itself during food processing and storage, and its properties are relatively stable, so sunset yellow is widely used as a colorant in some foods and medicines. However, if sunset yellow is taken in excess, it will cause damage to liver cells, and in severe cases, it can cause kidney failure, which will cause gre...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/26
CPCG01N27/26G01N27/308
Inventor 宋力卢先春许春萱胡蝶师赛鸽
Owner XINYANG NORMAL UNIVERSITY
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