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Improved method for rapid detection of formaldehyde content

A formaldehyde content, fast technology, applied in the measurement device, color/spectral property measurement, preparation of test samples, etc., can solve problems such as harm to consumers' health, and achieve the effect of eliminating interference, high sensitivity, and simple operation

Inactive Publication Date: 2017-09-29
安徽爱弥儿检验检测有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's Food Hygiene Law clearly stipulates that formaldehyde and formaldehyde-containing compounds are prohibited from being used as food additives. However, some unscrupulous traders add formaldehyde to aquatic food to achieve the purpose of antisepsis and increase food brittleness, which seriously endangers the health of consumers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A kind of method for the rapid detection formaldehyde content of improvement that the present invention proposes, comprises the following steps:

[0018] S1. Take 15g of the food sample to be tested, after ultrasonic crushing, add 35g of double distilled water at a speed of 580r / min, mix and dissolve at a high speed for 40min, then add 55g of 48% ethanol solution, let it stand for 1.5h, and separate Formaldehyde solution A;

[0019] S2. Dissolve dibenzothiophene in chloroform according to the mass ratio of 1:50:2.5:1:1.5:10, stir and mix at a speed of 250r / min, add methacrylic acid and silica gel while stirring, and then add initiator and After stirring and mixing at room temperature for 12 minutes, it was ultrasonically dissolved for 30 minutes, heated to 65°C, reacted for 20 hours, and then washed with excess ethanol solution and methanol and acetic acid mixture with a mass ratio of 1:1 for 25 minutes to obtain silica gel surface molecules To imprint the polymer, add...

Embodiment 2

[0023] A kind of method for the rapid detection formaldehyde content of improvement that the present invention proposes, comprises the following steps:

[0024] S1. Take 20g of the food sample to be tested, after ultrasonic crushing, add 40g of double distilled water at a speed of 480r / min, mix and dissolve at high speed for 50min, then add 65g of 55% ethanol solution, let it stand for 2h, and separate formaldehyde-containing Solution A;

[0025] S2. Dissolve dibenzothiophene in chloroform at a mass ratio of 1:50:2.5:1:1.5:10, stir and mix at a speed of 200r / min, add methacrylic acid and silica gel while stirring, and then add initiator and After stirring and mixing at room temperature for 8 minutes, it was ultrasonically dissolved for 35 minutes, heated to 76°C, reacted for 18 hours, and then washed with excess ethanol solution and a mixture of methanol and acetic acid with a mass ratio of 1:1 for 20 minutes to obtain silica gel surface molecules To imprint the polymer, add ...

Embodiment 3

[0029] A kind of method for the rapid detection formaldehyde content of improvement that the present invention proposes, comprises the following steps:

[0030] S1. Take 25g of the food sample to be tested, after ultrasonic crushing, add 45g of double distilled water at a speed of 680r / min, mix and dissolve at high speed for 30min, then add 75g of 38% ethanol solution, let it stand for 1h, and separate formaldehyde-containing Solution A;

[0031] S2. Dissolve dibenzothiophene in chloroform according to the mass ratio of 1:50:2.5:1:1.5:10, stir and mix at a speed of 300r / min, add methacrylic acid and silica gel while stirring, and then add initiator and After stirring and mixing at room temperature for 8 minutes, it was ultrasonically dissolved for 40 minutes, heated to 58°C, reacted for 22 hours, and then washed with excess ethanol solution and a mixture of methanol and acetic acid with a mass ratio of 1:1 for 15 minutes to obtain silica gel surface molecules To imprint the p...

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Abstract

The invention discloses an improved method for rapid detection of formaldehyde content, and the method includes the following steps: taking a to-be-measured food sample for ultrasonic crushing, adding redistilled water to dissolve the to-be-measured food sample, adding an ethanol solution, and standing for separation to obtain a formaldehyde-containing solution A; adding an excess amount of a silica gel surface molecular imprinted polymer to the formaldehyde-containing solution A, and centrifuging after ultrasonic dispersion to obtain a solution B; adding the redistilled water to dissolve a phenol reagent to obtain a solution C, adding hydrochloric acid to dissolve ammonium ferric sulfate to obtain a solution D; and mixing the solution B, the solution C and the solution D, add the redistilled water for dilution, standing after shocking reaction, and measuring with a visible light spectrophotometer to obtain results. The improved for rapid detection of formaldehyde content has the characteristics of fast speed, high accuracy and high sensitivity, the minimum detectable concentration is 0.02ppm, and the method can effectively detect trace formaldehyde in illegally added food, and is worthy of promotion.

Description

technical field [0001] The invention relates to the technical field of food safety detection, in particular to an improved method for rapidly detecting formaldehyde content. Background technique [0002] Formaldehyde (molecular formula: HCHO), also known as formic aldehyde, is the simplest form of aldehyde and is usually a flammable, colorless and irritating gas. Soluble in water, alcohol and ether. 35-40% formaldehyde solution is called formalin. Formaldehyde is an important organic raw material, mainly used in plastic industry, synthetic fiber, leather industry, medicine, dyestuff and food, etc. Adding formaldehyde to food can extend the shelf life of food, prevent food from going bad, and play a role in disinfection and sterilization. However, formaldehyde has a strong ability to destroy biological cell proteins, which can cause damage to human skin, respiratory tract and internal organs, anesthetize the central nervous system of humans, and can cause pulmonary edema, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/28
CPCG01N21/3103G01N1/28
Inventor 王祖涵杨巍巍陈翔
Owner 安徽爱弥儿检验检测有限公司
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