Graphene-Cuprous Oxide Composite Film Modified Acetylene Black Electrode for Detecting Vanillin in Food and Its Detection Method

A technology of cuprous oxide and acetylene black, which is applied in the field of analytical chemistry or food safety, can solve the problems of difficult popularization, expensive equipment, complicated operation, etc., and achieve the effect of increasing the dosage and improving the dispersion

Active Publication Date: 2018-12-21
HENGYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a graphene-cuprous oxide composite film modified acetylene black electrode and a detection method for detecting vanillin (content) in food, to solve the problems of expensive instruments, complicated operation, and difficult popularization, and to provide quality inspection Departments or manufacturers provide a fast, accurate, easy-to-operate, and low-cost vanillin quantitative analysis method

Method used

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  • Graphene-Cuprous Oxide Composite Film Modified Acetylene Black Electrode for Detecting Vanillin in Food and Its Detection Method
  • Graphene-Cuprous Oxide Composite Film Modified Acetylene Black Electrode for Detecting Vanillin in Food and Its Detection Method
  • Graphene-Cuprous Oxide Composite Film Modified Acetylene Black Electrode for Detecting Vanillin in Food and Its Detection Method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The modified electrode of the present invention such as figure 1 As shown, the acetylene black base electrode is included, and the surface of the acetylene black base electrode is coated with a film formed by electroreduction of graphene oxide and cuprous oxide nanocomposite. Described acetylene black substrate electrode comprises casing 1 and the copper rod 2 that is positioned at casing 1, and copper rod 2 diameter is 1mm, and casing 1 diameter is 6mm, and length is 6cm, and the material of casing 1 is polytetrafluoroethylene, and casing 1 front end is provided with There is a cavity 3 with a diameter of 3 mm and a depth of 2 mm. The cavity is filled with a mixture 4 of acetylene black and paraffin wax. The end of the electrode is drawn out, and the electrode surface is coated with a film 5 formed by electroreduction graphene oxide and cuprous oxide nanocomposite. Concrete preparation method comprises the following steps:

[0064] (1) Preparation of acetylene black ...

Embodiment 2

[0080] The modified electrode prepared in Example 1 was used to study the detection method of vanillin, and to make a standard curve.

[0081] 1. Preparation of vanillin standard solution:

[0082] (1) Preparation of standard stock solution: Accurately weigh 0.1521g of vanillin solid, first dissolve it with a small amount of ethanol, then dilute to volume with deionized water in a 100mL volumetric flask, and make a concentration of 1×10 -2 mol / L standard stock solution, put it in a brown bottle and store it in a refrigerator at 4°C.

[0083] (2) Preparation of standard working solution: pipette a certain amount of standard stock solution in step (1), dilute to volume step by step with deionized water, and obtain a concentration range of 1×10 -8 mol / L~1×10 -3 mol / L standard working solution. The standard working solution was temporarily prepared before use.

[0084] (3) Preparation of standard test solution: use a pipette to pipette a certain amount of working solution of d...

Embodiment 3

[0089] In order to evaluate the selectivity of the method, the graphene-cuprous oxide composite film prepared in Example 1 was used to modify the acetylene black electrode as the working electrode, and the interference of common metal ions and organic substances in the sample to the determination of vanillin was investigated. The results show that when the relative error is not more than ±5%, the 1000-fold concentration of Cl - , CO 3 2- , NO 3 - , SO 4 2- , Zn 2+ 、K + 、Na + 、Al 3+ ; 500 times the concentration of NH 4 + , Ca 2+ 、Cu 2+ , Mg 2+ ;200 times concentration of starch, glucose, lactic acid, dextrin, ascorbic acid, oxalic acid, citric acid, tartaric acid, benzoic acid, fructose, sucrose, 10 times concentration of guaiacol, chlorogenic acid, caffeic acid, p-hydroxybenzaldehyde , uric acid; 2 times the concentration of ferulic acid, syringaldehyde, and sinapinic acid did not interfere with the determination of 10μM vanillin. The above results show that th...

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Abstract

The invention discloses a method for detection of vanillin in food, and belongs to the field of analytical chemistry or the field of food safety. With a graphene-supported cuprous oxide nanoparticle composite film modified acetylene black electrode as a working electrode, the vanillin in the food is detected by an electrochemical method. The detection method has the advantages of wide linear range, high sensitivity, low detection limit, simple operation, fast detection, low detection cost and accurate results.

Description

technical field [0001] The invention belongs to the field of analytical chemistry or food safety, and specifically relates to a graphene-cuprous oxide composite film modified acetylene black electrode for detecting vanillin in food and a detection method. Background technique [0002] Vanillin, another name vanillin, chemical name 3-methoxy-4-hydroxybenzaldehyde, has vanilla aroma and strong milky aroma, is one of the most widely used spices in the food industry, and can also be used as a preservative And pharmaceutical and other industrial raw materials. Natural vanillin can be extracted from the flower pods of vanilla, but the amount of vanillin obtained in this way is small and the price is high. At present, vanillin is mainly prepared by chemical methods, but the chemically synthesized vanillin has no nutritional value, and when consumed in large doses, it can cause headaches, nausea, vomiting, dyspnea, and even damage the liver and kidneys. Therefore, the Ministry of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/30G01N27/48
Inventor 邓培红贺全国曾荣英张军
Owner HENGYANG NORMAL UNIV
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