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Electrochemical sensor for quickly detecting Sudan I in foods and preparation method thereof

A Sudan red and electrochemical technology, applied in analytical chemistry and food safety fields, can solve the problems of long analysis time, great harm to human body, complicated operation, etc., and achieve the effect of wide source of raw materials, simple operation and simple preparation method

Inactive Publication Date: 2010-11-03
HUBEI INSPECTION & QUARANTINE TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these sensors sample mercury as a sensitive material, which is not only harmful to the human body, but also causes environmental pollution.
In addition, in order to avoid the interference of the dissolved oxygen reduction signal, these electrochemical sensors need to pass high-purity inert gas (such as nitrogen, argon, etc.) to remove the oxygen in the solution before the measurement, so the operation is complicated and the whole analysis time is too long ( About 15~20min)

Method used

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  • Electrochemical sensor for quickly detecting Sudan I in foods and preparation method thereof
  • Electrochemical sensor for quickly detecting Sudan I in foods and preparation method thereof
  • Electrochemical sensor for quickly detecting Sudan I in foods and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 As shown, the electrochemical sensor of the present invention is mainly composed of an insulating column 1, a metal conductor 2, a cavity 3 and a sensitive material 4. The diameter of the insulating column 1 is usually 3 to 15 mm, and polytetrafluoroethylene can be used as the insulating material. Polytrifluoroethylene or polyetheretherketone resin can also be used; the metal conductor 2 is penetrated and fixed in the center of the insulating column 1 , and one end thereof is located outside the rear end of the insulating column 1 . Metal conductors can be copper rods, aluminum rods or platinum rods, usually with a diameter of 0.25-3mm. A cavity 3 is provided at the front end of the insulating column 1. The cavity 3 is generally cylindrical, with a height of 0.5-3 mm and a diameter of 1-6 mm. Sensitive material 4 is a mixture of montmorillonite, conductive carbon powder and binder, and the mass percentages of montmorillonite and conductive carbon powde...

Embodiment 2

[0029] Mix the montmorillonite with a particle size of 100nm, graphite powder and paraffin oil with a particle size of 300nm, the mass percentages of montmorillonite and graphite powder in the resulting mixture are 15% and 73% respectively, and the rest are paraffin oil , to obtain the sensitive material, and then the sensitive material is filled in the cylindrical cavity with a diameter of 3 mm and a height of 1 mm at the front end of the polytetrafluoroethylene column described in Example 1. The polytetrafluoroethylene column is 5 cm long and 6 mm in diameter, and the center is inserted And a copper rod with a diameter of 1mm is fixed, so that the sensitive material is in contact with the end of the copper rod. Then grind and polish on the weighing paper to obtain an electrochemical sensor for fast detection of Sudan I in food.

Embodiment 3

[0031] Mix the montmorillonite with a particle size of 100nm, graphite powder and paraffin oil with a particle size of 300nm, the mass percentages of montmorillonite and graphite powder in the resulting mixture are 10% and 75% respectively, and the rest are paraffin oil , to obtain the sensitive material, and then the sensitive material is filled in the cylindrical cavity with a diameter of 3 mm and a height of 1 mm at the front end of the polytetrafluoroethylene column described in Example 1. The polytetrafluoroethylene column is 5 cm long and 6 mm in diameter, and the center is inserted And a copper rod with a diameter of 1mm is fixed, so that the sensitive material is in contact with the end of the copper rod. Then grind and polish on the weighing paper to obtain an electrochemical sensor for fast detection of Sudan I in food.

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Abstract

The invention discloses an electrochemical sensor for quickly detecting Sudan I in foods and a preparation method thereof. The preparation method of the sensor comprises the following steps of: uniformly mixing montmorillonite, conductive carbon powder and adhesive at a certain percentage to form a sensitive material; filling the sensitive material in a cavity on the front end of an insulating column and enabling the sensitive material contact with the end of a metal conductor inserted and fixed at the centre of the insulating column. The electrochemical sensor of the invention has the advantages of high sensitivity, low detection limitation, capability of realizing quick detection to the Sudan I in foods, simple and convenient operation, environment-friendliness, wide raw material sources and low cost; moreover, the preparation method is simple.

Description

technical field [0001] The invention relates to an electrochemical sensor for rapidly detecting Sudan I in food and a preparation method thereof, which belongs to the field of analytical chemistry and also belongs to the field of food safety. Background technique [0002] In the process of food processing, in order to improve the sensory properties and make it more attractive, some pigments are often added. At present, the pigments added can be divided into two categories: natural pigments and synthetic pigments. Natural pigments are derived from natural products and have little harm to the human body. Synthetic pigments are organic pigments synthesized by chemical methods. Compared with natural pigments, synthetic pigments are not only bright in color and strong in coloring power, but also stable in nature and low in price, so they are widely used in the food industry. However, modern medical research has confirmed that many synthetic pigments are very harmful to the huma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26
Inventor 胡小钟王鹏吴康兵
Owner HUBEI INSPECTION & QUARANTINE TECH CENT
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