Method for detecting 205 kinds of pesticide residues in rice

A technology for pesticide residues and detection methods, which is applied in the field of detection of pesticide residues in rice, can solve problems such as the inability to meet the actual needs of pesticide residue inspection in exported rice, and achieves protection of human health, increased extraction efficiency, and promotion of import and export. effect of trade

Inactive Publication Date: 2015-06-10
陈溪 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are 305 industry standard detection methods, involving 338 chemical substances in the detection items, most of which are single-residue analysis methods, which are far from meeting the actual needs of export rice pesticide residue inspection

Method used

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  • Method for detecting 205 kinds of pesticide residues in rice
  • Method for detecting 205 kinds of pesticide residues in rice
  • Method for detecting 205 kinds of pesticide residues in rice

Examples

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Embodiment 1

[0068] The detection method of 205 kinds of pesticide residues in rice of embodiment 1

[0069] 1. Sample extraction: 5g (accurate to 0.01g) rice sample is placed in a 50mL centrifuge tube, add 10mL water, cover, vortex mix for 1 minute, then add 15mL acetonitrile (0.1% acetic acid) to the centrifuge tube, vortex 1 Minutes, then add 6g of anhydrous magnesium sulfate and 1.5g of sodium acetate, shake vigorously for 20s to fully disperse the massive crystals. Centrifuge at a standard speed of 4000 rpm for 5 minutes.

[0070] 2. Extraction purification

[0071] Take 8mL of the upper layer solution from the supernatant after centrifugation, and place it in a 15mL centrifuge tube, which has been added with 400mg of PSA, 1200mg of anhydrous magnesium sulfate, and 400mg of C18, vortexed for 15min, and 4000 rpm standard Spin down for 5 minutes.

[0072] 3. Determination by liquid chromatography-mass spectrometry / mass spectrometer

[0073] The sample and standard working solution w...

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Abstract

The invention relates to the analytical chemistry and food safety field and in particular relates to a method for detecting 205 kinds of pesticide residues in rice. According to the method, a sample is extracted by acetonitrile, extraction solution is purified by a QuEChERS method, a chromatographic column shown as below is adopted as an analytical column, methyl alcohol-ammonium formate aqueous solution is used as a moving phase, then gradient elution, electrospraying and positive ion scanning are carried out to separate and detect 205 kinds of pesticide residues; mass spectrum conditions are optimized and the optimal mass spectrum analysis condition is established while the sensitivity of all ingredients is considered; the detection limits of 205 kinds of pesticides are all lower than 10mu g/kg, and the range of the recovery rate of 205 kinds of pesticides is within 50-130%. According to the method, the detection limit, the recovery rate, the precision and other technical indexes all meet the domestic and foreign requirements for detection of pesticide residues in rice.

Description

Technical field: [0001] The invention relates to the fields of analytical chemistry and food safety, in particular to a method for detecting pesticide residues in rice. Background technique: [0002] With the increase in the application of pesticides in agricultural production, people have gradually discovered that their residues in plants can be transmitted to humans through plant-derived foods. Therefore, the problem of pesticide residues in agricultural products has brought great hidden dangers to people's health. [0003] With global economic integration and internationalization of food trade, food safety has become a worldwide challenge and an important global public health issue. The safety of plant-based food has become the focus of attention all over the world, and the problem of pesticide residues is the most important pesticide affecting the safety of plant-based food. my country is a rice exporter, exporting more than 2 million tons of rice every year, mainly to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88
Inventor 陈溪董伟峰崔晗
Owner 陈溪
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