Detection method of sunset yellow in food

A detection method, sunset yellow technology, applied in the field of analytical chemistry or food safety, can solve the problems of low detection line, long analysis time, expensive working electrode, etc., achieve strong adsorption and conductivity, simple production process, and stability Good results

Inactive Publication Date: 2013-01-02
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chromatography has high sensitivity and good accuracy, but its sample pretreatment is cumbersome, the analysis time is long and the required instruments are expensive
Although spectrophotometry and fluorescence spectroscopy are simple in instruments and easy to operate, they have low sensitivity and poor selectivity.
Electrochemical detection of sunset yellow has also been studied in recent years, but its working electrode is more expensive and needs to be modified to achieve a lower detection line.

Method used

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  • Detection method of sunset yellow in food
  • Detection method of sunset yellow in food

Examples

Experimental program
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Effect test

preparation example Construction

[0022] 1. Preparation of Expanded Graphite Working Electrode

[0023] Weigh a certain amount of the mixture of expanded graphite and paraffin, and its mass ratio is 99:1. Heat slightly to melt the paraffin, stir evenly, take an appropriate amount to fill the electrode after cooling, polish until the surface of the electrode is smooth and flat, rinse with deionized water, and then the working electrode required for the experiment can be obtained.

[0024] 2. Preparation of stock solution

[0025] (1) Preparation of mother liquor: Accurately weigh a certain amount of sunset yellow solid, dissolve it with deionized water, dilute to volume, and prepare a concentration of 1.0×10 -4 mol L -1 mother liquor. Then take the above-mentioned certain amount of mother liquor and dilute to constant volume with deionized water to obtain a concentration range of 1.0×10 -8 mol L -1 ~1.0×10 -5 mol L -1 A series of mother liquors.

[0026] (2) Preparation of standard solutions of diffe...

Embodiment 1

[0029] Example 1: Detection of sunset yellow content in commercially available jelly

[0030] (1) Sample pretreatment: crush a commercially available jelly of a certain brand, weigh 10 g into a 100 mL beaker, add 15 mL of ethanol to soak for 10 min, and then sonicate for 30 min, so that the pigment in the jelly is completely extracted into the ethanol solution middle. Then at 5000 r·min -1 Centrifuge the above solid-liquid mixture for 10 min at a high speed, take the upper clear layer, wash the lower solid with deionized water until the washing liquid is colorless, and then wash 2~3 times, combine the clear liquid and dilute to volume in a 100 mL volumetric flask for later use.

[0031] (2) Take 5.0 mL of the constant volume solution in (1) and add 20 mL of it to a concentration of 0.5 mol L -1 BR, then use 1 mol·L -1 The pH of the mixed solution was adjusted to 6 with NaOH, and the volume was adjusted to 100 mL as the solution to be tested. Take a certain amount of the te...

Embodiment 2

[0037] Example 2: Detection of sunset yellow in commercially available fruit juices

[0038] (1) Sample pretreatment: Measure 20 mL of a certain brand of fruit juice to be analyzed, filter it with a filter membrane with a specification of 0.45 μm, take the filtrate to a 100 mL volumetric flask, -1 Centrifuge at a high speed for 10 min, and pool the supernatant for later use.

[0039] (2) Take 5.0 mL of the constant volume solution in (1) and add 20 mL of it to a concentration of 0.5 mol L -1 BR, then use 1 mol·L -1 The pH of the mixed solution was adjusted to 6 with NaOH, and the volume was adjusted to 100 mL as the solution to be tested. Take a certain amount of the test solution in a 25 mL beaker and enrich it for 9 minutes under the condition of stirring, then measure its corresponding peak current value according to the experimental conditions of the present invention. Under the same test conditions, test in parallel for 4 times, then calculate the corresponding concent...

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Abstract

The invention relates to a detection method of sunset yellow in food, and belongs to the field of analytical chemistry or the field of food safety. With the strong adsorption capacity of expanded graphite with a loose porous structure, the expanded graphite is doped with a certain amount of paraffin to prepare an expanded graphite electrode which is used as a working electrode, and sunset yellow in food is detected by an electrochemical method. The detection method of the invention has the advantages of high sensitivity, low detection limit, simple method, and accurate results. The expanded graphite electrode has lower price, simpler manufacturing process, lower detection cost, and better detection effect than other electrodes.

Description

technical field [0001] The invention relates to a method for detecting sunset yellow in food. The invention uses an expanded graphite electrode as a working electrode, and uses differential pulse voltammetry to detect sunset yellow in food. Belonging to the field of analytical chemistry or food safety. Background technique [0002] In the process of food processing, in order to make the food look more attractive, some pigments are often added. Usually added pigments are divided into two categories: natural pigments and synthetic pigments. Compared with natural pigments, synthetic pigments have bright colors, stable properties and low prices, so they are widely used in the food industry. my country has strict restrictions on adding synthetic pigments to food: all meat and its processed products, fish and its processed products, vinegar, soy sauce, fermented bean curd and other condiments, fruits and their products, milk and dairy products, baby food Food, biscuits, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48
Inventor 陈智栋祝惠惠张静王文昌申屠超何莹
Owner CHANGZHOU UNIV
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