Real-time direct analysis method for rapidly determining free formaldehyde in water-soaked products

A free formaldehyde, rapid determination technology, applied in the field of free formaldehyde, to achieve the effect of simple operation, high efficiency and reliable qualitative results

Inactive Publication Date: 2015-04-08
NANJING UNIV OF TECH
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  • Claims
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Problems solved by technology

False-positive results may occur when using a single-stage full scan

Method used

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  • Real-time direct analysis method for rapidly determining free formaldehyde in water-soaked products

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Embodiment Construction

[0013] Further illustrate the present invention below by way of embodiment, but do not therefore limit the present invention among the scope of described embodiment

[0014] Take 5.0 mL of duck blood soaking solution, add 1.0 mL of 2,4-dinitrophenylhydrazine solution, place it in a water bath at 60°C for 15 minutes, cool down, and adjust the pH of the solution to weak acidity. The ionic strength of the secondary ion m / z151 under the condition of the selected molecular ion peak m / z209 was determined by real-time direct analysis ion source tandem triple quadrupole mass spectrometry, and the quantitative analysis was carried out by external standard method.

[0015] Real-time direct analysis mass spectrometer ion source conditions: negative ion mode, working gas is high-purity helium, sample transmission speed 0.6mm / s, distance between ion source and transfer tube: 3.5cm, DART ion source temperature is 300°C; triple quadrupole mass spectrometer Conditions: In negative ion mode, m...

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Abstract

The invention discloses a real-time direct analysis method for rapidly determining free formaldehyde in water-soaked products. The method comprises the following steps: enabling 2,4-dinitrophenylhydrazone as a reaction reagent to react with formaldehyde, taking an appropriate amount of reaction liquid to be dripped on a screen so as to be naturally dried in air to obtain a product, placing the product between a real-time direct analysis mass spectrum ion source gas outlet and a triple quadrupole mass spectrometer ion inlet, and determining, wherein DART ion source conditions are as follows: a negative ion mode is adopted and an ion source temperature is 300 DEG C, and triple quadrupole mass spectrometer conditions are as follows: the mass analyzer voltage is 3000V, and the mass-to-charge ratio of parent ions to quantitative ions to qualitative ions is 209 to 151 to 133 in a second-grade scanning mode; and by comparing second-grade mass spectrograms of a sample and a control sample, analyzing the free formaldehyde in the water-soaked products and quantifying by adopting an external standard method. The real-time direct analysis method provided by the invention has the advantages that the complex pretreatment and chromatographic separation process is not needed, the detection limit is up to 1ppm, and the detection method is sensitive, simple and convenient, and can be used for rapidly detecting the free formaldehyde in the water-soaked products.

Description

technical field [0001] The invention belongs to the field of food safety, and in particular relates to the detection of free formaldehyde in water hair products by using a DART ion source combined with triple quadrupole mass spectrometry. Background technique [0002] Formaldehyde is a protoplasmic poison that destroys the protein of biological cells. It can cause damage to human skin, respiratory tract and internal organs. The World Health Organization confirms that formaldehyde is a teratogen, a carcinogen, and a source of allergies, and long-term exposure will cause gene mutations. [0003] If formaldehyde in food enters the human body through the mouth, it will affect the digestive, nervous, circulatory and urinary systems, and in severe cases will be life-threatening. Ingestion of formaldehyde solution by mistake can cause damage to the mouth, esophagus, and gastrointestinal tract, perforation of the digestive tract, or shock, coma, and liver and kidney damage. Digest...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62
Inventor 李方实陈玲玲李壹刘媛媛商丽娟余童魁
Owner NANJING UNIV OF TECH
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