Composite modified electrode and preparation method and application thereof

A technology for modifying electrodes and gold electrodes, applied in the field of electrochemical analysis, can solve the problems of cumbersome detection process, complex sample processing, complex detection process, etc., and achieve the effects of high sensitivity, simple operation and good uniformity

Active Publication Date: 2021-04-30
SHANXI AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, the disadvantages of these methods have gradually emerged. They usually have the following disadvantages: complex detection process, low sensitivity, high operation cost, not easy to carry, and detection personnel need to receive special training
At present, the methods used to detect xylitol mainly include: ion chromatography, gas chromatography, high performance liquid chromatography, etc., but these methods have shortcomings such as cumbersome detection process, low sensitivity, and complicated sample processing, and have certain limitations. limitation

Method used

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  • Composite modified electrode and preparation method and application thereof
  • Composite modified electrode and preparation method and application thereof
  • Composite modified electrode and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1: A kind of preparation method of composite modified electrode, specifically comprises the following steps:

[0050] (1) Grinding of the gold electrode: place 0.30 μm and 0.05 μm aluminum oxide powder on the suede, wet the gold electrode with distilled water and polish the gold electrode in a vertical 8 shape, polish the electrode surface about 200 times, after wet grinding Rinse again, place the polished electrode tip vertically in a small beaker filled with a small amount of distilled water, put it into an ultrasonic cleaner to clean the working electrode for five minutes, then take it out and rinse it with distilled water to obtain a bare gold electrode with a clean surface.

[0051] The prepared working electrode was immersed in 0.1mol / L dilute sulfuric acid solution, and the surface of the working electrode was electrochemically polished and characterized by cyclic voltammetry. The scanning range was 0-1.6V and the scanning speed was 0.1V / s. Cycle 20 Ci...

Embodiment 2

[0059] Embodiment 2: each step characterization diagram in embodiment 1:

[0060] 1) Characterization of bare electrode in sulfuric acid solution

[0061] figure 1 The process diagram of electrochemical grinding of gold electrode after alumina powder grinding and ultrasonic cleaning in 0.1mol / L dilute sulfuric acid, figure 1 Three oxidation peaks and one large reduction peak appeared in [55] . At about 0.9V, the first oxidation peak appeared, and then two consecutively appeared, and when it cycled to about 0.8V, a large reduction peak began to appear, and then returned to the starting point. This is a cycle, with such The cycle repeats 20 times. from figure 1 It can be seen that the reduction peak after grinding is −60 μA, which is much lower than −40 μA, indicating that the grinding effect of the gold electrode is good, and the following experiments can be continued on the basis of this electrode grinding. However, if the reduction peak cannot be lower than −25 μA or ar...

Embodiment 3

[0068] Example 3: Factors such as coating sequence, deposition potential, deposition time, scanning rate, and number of scanning circles all have varying degrees of influence on the detection sensitivity of aluminum ions.

[0069] Taking aluminum ions as an example, the optimal parameters of the above-mentioned modified electrodes are experimentally demonstrated:

[0070] Preparation of buffer solution (HAc-NaAc): Prepare 0.1mol / L sodium acetate and acetic acid solution, mix well and use a pH meter to obtain the required pH.

[0071] Preparation of aluminum standard solution: weigh 0.2414gAlCl 3 •6H 2 O was put into a volumetric flask, dissolved in buffer solution and adjusted to 100mL to obtain 10 -2 mol / L aluminum chloride solution should be diluted step by step when used.

[0072] 1) The effect of coating sequence on the detection of aluminum ions by the modified electrode:

[0073] According to the experimental procedure of Example 1, the electrodes were first manually...

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Abstract

The invention discloses a composite modified electrode as well as a preparation method and application thereof. The gold nano-poly(3-aminophenylboronic acid) chemically modified electrode has the advantages of high sensitivity, high detection speed, no additional indicator and simple operation, and can realize rapid, accurate and quantitative detection of aluminum ions and xylitol. Detection results show that indexes such as a linear range, a detection limit and reproducibility all meet requirements, and the modified electrode can be successfully used for food detection and analysis and further used for evaluating food quality.

Description

technical field [0001] The invention belongs to the technical field of electrochemical analysis, and in particular relates to a novel composite modified electrode and its application in the detection of aluminum ions and xylitol. Background technique [0002] The intake sources of aluminum in the human body mainly include: water sources, animals and plants, food additives and various containers. After the food containing too much aluminum ions is ingested by the human body, it is difficult to excrete it from the body and will be deposited in the body. Certain hazards, such as causing chronic toxic side effects. In addition, the compound derivatives of aluminum are widely used in daily diet as food additives. The aluminum content in fried dough sticks, steamed buns, instant noodles, puffed food, etc. are generally exceeding the standard. Long-term intake of excessive aluminum has harmful effects on the human body that cannot be ignored. , therefore, how to quickly and accura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N27/30G01N27/333
CPCG01N27/26G01N27/30G01N27/3335
Inventor 吴锁柱郭红媛梁月敏王术荣
Owner SHANXI AGRI UNIV
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