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Rapid detection method for formaldehyde in food

A detection method and technology for formaldehyde, applied in the field of rapid detection of formaldehyde in food, can solve the problems of error in detection results, poor specificity and sensitivity, unfavorable popularization and popularization and use, and achieve the elimination of influence, easy identification, and simple reagent preparation method. Effect

Inactive Publication Date: 2016-08-03
HEBEI ANJIELUN BIOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Formaldehyde detection methods commonly used at present have spectrophotometry, gas chromatography, liquid chromatography, etc., these methods such as gas chromatography and liquid chromatography need special equipment, and need special personnel to operate, are not conducive to popularization and promotion of use, and Although the spectrophotometric method is simple to operate, its specificity and sensitivity are relatively poor, and it is easy to cause errors in the detection results. Therefore, there is an urgent need for a method for the detection of formaldehyde in food that meets the requirements of simple detection methods, accurate results, easy identification, and high sensitivity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for quickly detecting formaldehyde in food, comprising the following steps:

[0022] (1) Prepare the sample to be tested: weigh 2g of the solid sample, pulverize it with a pulverizer, add ethanol to stir and ultrasonically mix for 5min, after filtration, take the filtrate and add zinc acetate and ethanol volume ratio of 20:80 zinc acetate / ethanol to mix The solution is filtered again, and the filtrate is taken as the sample to be tested;

[0023] (2) Preparation of detection solution: Weigh 5g of anhydrous sodium sulfite, 0.05g of aminopyridine, 0.05EDTA-2Na, 5g of sodium hydroxide and 0.2 of phloroglucinol, then add 50ml of distilled water to dissolve and mix well, and put them in 3 colorimetric tubes Add 10ml of liquid to each and label them as B1, B2 and B3 respectively, and set aside;

[0024] (3) Add the sample to be tested in (1) to B1, add 10ug / ml formaldehyde solution to B2, use B3 as a blank control tube, observe the color change of the solution, so a...

Embodiment 2

[0028] A method for quickly detecting formaldehyde in food, comprising the following steps:

[0029] (1) Prepare the sample to be tested: Weigh 5g of the solid sample, pulverize it with a pulverizer, add ethanol to stir and ultrasonically mix for 10min, after filtration, take the filtrate and add a mixture of zinc acetate and ethanol with a volume ratio of 40:60, and again Filter, and take the filtrate as the sample to be tested;

[0030] (2) Preparation of detection solution: Weigh 10g of anhydrous sodium sulfite, 0.1g of aminopyridine, 0.1EDTA-Na, 10g of sodium hydroxide and 0.2 of phloroglucinol, then add 100ml of distilled water to dissolve and mix well, and put them in 3 colorimetric tubes Add 15ml of liquid to the tube respectively, label the three colorimetric tubes as B1, B2 and B3, and set them aside;

[0031] (3) Add the sample to be tested to B1, add 100ng / ml formaldehyde solution to B2, and use B3 as a blank control tube, observe the color change of the solution, ...

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Abstract

The invention relates to the field of food safety, in particular to a rapid detection method for formaldehyde in food.The detection method comprises the following steps that an appropriate amount of crushed sample is added into ethanol to be stirred and mixed to be uniform, filtering is conducted, filtrate is taken, an appropriate amount of precipitating agent is added into the filtrate, filtering is conducted, filtrate is taken and serves as a sample solution to be detected, or a liquid reagent is directly taken to serve as a sample to be detected; anhydrous sodium sulfite, aminopyrin, EDTA-2Na, sodium hydroxide and phloroglucinol are weighed, distilled water is added to the materials, and the obtained mixture is put into three colorimetric tubes for use; the prepared sample solution to be detected and a formaldehyde solution are added to two colorimetric tubes respectively, the third colorimetric tube serves as a blank reference tube, solution color changes are observed, and if the solution color is changed into orange red, it is judged that the sample contains formaldehyde.According to the rapid detection method for formaldehyde in the food, operation is easy and convenient, detection is rapid, all reagents are prepared to be liquid, long-period preservation is promoted, pretreatment is conducted on the samples successively before detection is conducted, and the authenticity and reliability of a detection result are improved.

Description

technical field [0001] The invention relates to the field of food safety, in particular to a method for rapidly detecting formaldehyde in food. Background technique [0002] Formaldehyde is one of the highly toxic substances. WHO has identified it as a carcinogenic and teratogenic substance. In addition, formaldehyde can cause harm to the human respiratory system, immune system and endocrine system, and can cause chronic respiratory diseases, colon cancer, menstrual irregularities, etc. It can also lead to the decline of memory and intelligence of teenagers. Formaldehyde also has a coagulation effect. It is not easy to metabolize and excrete after being combined with proteins in the human body. It can cause leukemia after long-term accumulation in the body. [0003] "Hygienic Standards for the Use of Food Additives" GB2760-2007 Appendix C of the list of processing aids used in the food industry, formaldehyde is listed at No. 38, but at the same time it is stipulated that th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 余雪峰
Owner HEBEI ANJIELUN BIOTECH CO LTD
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