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Method for quick detection of formaldehyde in food

A detection method, formaldehyde technology, applied in the field of formaldehyde detection, can solve the problems affecting the accuracy and operability of test results, unsatisfactory precipitation effect, background interference, etc., achieve the goal of shortening the filtration time, good effect and ensuring accuracy Effect

Inactive Publication Date: 2006-02-08
CHINESE ACAD OF INSPECTION & QUARANTINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These protein precipitation methods either have unsatisfactory precipitation effects, or cause background interference due to the acidity of the system or poor stability of the system, which directly affects the accuracy and operability of the test results.

Method used

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  • Method for quick detection of formaldehyde in food
  • Method for quick detection of formaldehyde in food

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) Prepare reagents:

[0040] Prepare protein precipitation reagent A: put 10g of lead acetate in the volumetric flask, add 100mL of distilled water; Shake until fully dissolved; prepare color developer: put 25g ammonium acetate, 3mL glacial acetic acid, 0.3mL acetylacetone into the volumetric flask; add 100mL distilled water, shake gently until fully dissolved;

[0041] 2) Prepare the sample solution to be tested:

[0042] Chopped Shuifacai sample, weighed 10.0g into a 100mL volumetric flask, added distilled water to 60mL, tightly closed the lid, left for (60±5)min, shook the flask every 5min, added 10.0mL protein precipitation reagent A, lightly Shake gently, then add 10.0mL protein precipitation reagent B, after shaking gently, dilute to 100mL mark with distilled water, shake well, let stand, and filter with medium-speed filter paper;

[0043] The above-mentioned sample to be tested is detected according to the steps in the above-mentioned detection method.

Embodiment 2

[0045] 1) Prepare reagents:

[0046] Prepare protein precipitation reagent A: put 30g of lead acetate in the volumetric flask, add 100mL of distilled water; Shake until fully dissolved; prepare color developer: put 25g ammonium acetate, 3mL glacial acetic acid, 0.5mL acetylacetone into the volumetric flask; add 100mL distilled water, shake gently until fully dissolved;

[0047] 2) Prepare the sample solution to be tested:

[0048] The sea cucumber samples made of distilled water were smashed with a mash machine, weighed 5.0g into a 100mL volumetric flask, added distilled water to 60mL, closed the lid tightly, left for (60±5)min, shake the flask every 5min, and added 10.0mL of protein precipitation Reagent A, shake gently, then add 10.0mL protein precipitation reagent B, after shaking gently, dilute to 100mL mark with distilled water, shake well, let stand, filter with medium-speed filter paper;

[0049] The above-mentioned sample to be tested is detected according to the ste...

Embodiment 3

[0051] 1) Prepare reagents:

[0052]Prepare protein precipitation reagent A: put 15g of lead acetate in the volumetric flask, add 100mL of distilled water; Shake until fully dissolved; prepare a color developer: put 25g ammonium acetate, 3mL glacial acetic acid, 0.4mL acetylacetone into the volumetric flask; add 100mL distilled water, shake gently until fully dissolved;

[0053] 2) Prepare the sample solution to be tested:

[0054] Weigh 10.0g of flour sample into a 100mL volumetric flask, add distilled water to 60mL, close the lid tightly, let it stand for (60±5)min, shake the flask every 5min, add 10.0mL protein precipitation reagent A, shake gently, and then Add 10.0mL protein precipitation reagent B, after shaking gently, dilute to 100mL mark with distilled water, shake well, let stand, and filter with medium-speed filter paper;

[0055] The above-mentioned sample to be tested is detected according to the steps in the above-mentioned detection method.

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Abstract

The invention provides a fast method for measuring methylene oxide of the food, which comprises the following steps: 1. preparing protein precipitant and color reagent; 2. preparing tested sample solution; 3. labeling methylene oxide standard inventory liquid and drawing adjust curve; 4. measuring. The method can fast measure the methylene oxide of the sea foods, the flour, the fried bean milk cream rolls and the dry fruit.

Description

technical field [0001] The invention relates to a method for detecting formaldehyde, in particular to a method for rapidly detecting formaldehyde in food. Background technique [0002] Formaldehyde has a toxic effect on the central nervous system, and can also induce tumors. Oral administration of 10-20 ml of formaldehyde solution can cause death. Therefore, it is very important to monitor free formaldehyde in food and the environment. [0003] At present, there are a series of methods for the determination of formaldehyde, such as gas chromatography, ion chromatography, electrochemical method, lead acetate test paper method, detection tube method and spectrophotometry, among which the classic spectrophotometry has the characteristics of stability, sensitivity, and easy operation. And the most widely used. Sample pretreatment mainly includes distillation and water immersion extraction. Distillation method is complicated to operate and is prone to false positive results; wa...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/31G01N1/34
Inventor 邹明强戴华张晓华薛强董益阳李锦丰王楠
Owner CHINESE ACAD OF INSPECTION & QUARANTINE
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