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A preparation method of a poly-2,6-diaminopyridine-nickel ferricyanide modified electrode that can be used to detect nitrite in food

A technology of diaminopyridine and modified electrodes, applied in the direction of material electrochemical variables, etc., to achieve high sensitivity, simple preparation method, and wide detection range

Active Publication Date: 2019-10-11
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There have been reports on the electrochemical synthesis of poly-2,6-diaminopyridine, but there are few reports on the application of poly-2,6-diaminopyridine to detection

Method used

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  • A preparation method of a poly-2,6-diaminopyridine-nickel ferricyanide modified electrode that can be used to detect nitrite in food
  • A preparation method of a poly-2,6-diaminopyridine-nickel ferricyanide modified electrode that can be used to detect nitrite in food
  • A preparation method of a poly-2,6-diaminopyridine-nickel ferricyanide modified electrode that can be used to detect nitrite in food

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Embodiment 1

[0021] The present invention prepares poly 2,6-diaminopyridine-nickel ferricyanide modified electrode by electrochemical method. The experiment adopts three-electrode system, the glassy carbon electrode is the working electrode, the platinum plate electrode is the auxiliary electrode, and the saturated calomel electrode is the reference Electrode, containing 2mmol / L NiSO 4 , 0.25mol / L Na 2 SO 4 , 2mmol / L K 3 Fe(CN) 6 , 2mmol / L 2,6-diaminopyridine and 0.5mol / L H 2 SO 4 The poly-2,6-diaminopyridine-nickel ferricyanide modified electrode was prepared by cyclic voltammetry in the solution, the potential range of cyclic voltammetry was 0-1.2V, the scan rate was 100mV / s, and the polymerization was performed for 15 cycles. Then the poly-2,6-diaminopyridine-nickel ferricyanide was characterized by Fourier transform infrared spectroscopy. From attached figure 1 and 2 It can be seen that the poly-2,6-diaminopyridine-nickel ferricyanide complex was successfully modified on the su...

Embodiment 2

[0023] The present invention uses a poly-2,6-diaminopyridine-nickel ferricyanide modified electrode to detect nitrite. The experiment uses a three-electrode system, and the poly-2,6-diaminopyridine-nickel ferricyanide modified electrode is used as the working electrode. The platinum sheet was used as the counter electrode, the saturated calomel electrode was used as the reference electrode, and the electrolyte was phosphate buffer solution. Cyclic voltammetry was performed on nitrite. image 3 It can be seen that the poly-2,6-diaminopyridine-nickel ferricyanide modified electrode is effective for the detection of nitrite. The detection limit, sensitivity and detection linear range of the modified electrode for nitrite. From attached Figure 4 and Figure 5 It is known that the modified electrode has a lower detection limit, higher detection sensitivity and a wider detection linear range for nitrite. μAμM -1 .

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Abstract

The invention relates to a preparation method of a poly 2,6-diaminopyridine-nickel ferricyanide modified electrode capable of detecting nitrite in food. The preparation method comprises the followingsteps: preparing the poly 2,6-diaminopyridine-nickel ferricyanide modified electrode and detecting nitrite with the poly 2,6-diaminopyridine-nickel ferricyanide modified electrode. The preparation method of the poly 2,6-diaminopyridine-nickel ferricyanide modified electrode has the beneficial effects that the preparation method is simple, response to nitrite detection is faster, poly 2,6-diaminopyridine not only can be used for doping nickel ferricyanide with electro-catalytic property, but also can produce stronger electrostatic attraction for to-be-detected nitrite, so that nitrite is pre-concentrated on the surface of poly 2,6-diaminopyridine, and detection sensitivity is improved.

Description

technical field [0001] The invention relates to a preparation method of a poly-2,6-diaminopyridine-nickel ferricyanide modified electrode which can be used for detecting nitrite in food, and belongs to the fields of food detection and material synthesis. [0002] technical background [0003] Nitrite is a chemical substance that widely exists in the natural environment. Because it can prevent bacterial growth, it is often used in the food industry as a food additive. Foods such as grains and vegetables contain a certain amount of nitrite. The World Health Organization and the Food Science Committee of the European Commission set the maximum daily intake of nitrite as 0.07mg / Kg. Excessive nitrite enters the human blood and oxidizes normal hemoglobin containing Fe(II) to Fe(III) Methemoglobin makes normal hemoglobin lose its oxygen-carrying capacity. In addition, nitrite can also react with secondary amines, tertiary amines and amides to generate strong carcinogen nitrosamines...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/48
Inventor 孔泳王雪青
Owner CHANGZHOU UNIV