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Chemical luminescence enhanced type method for detecting pesticide residues

A technology of chemiluminescence and pesticide residues, which is applied in the field of chemiluminescence analysis and detection of trace agrochemicals, and enhanced chemiluminescence detection of pesticide residues, which can solve the problems of poor sensitivity and selectivity, high price, short service life, etc., and achieve Highly effective and highly sensitive effects

Inactive Publication Date: 2012-07-18
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

These chemiluminescent systems for detecting pesticide residues all use enzymes to improve detection sensitivity and selectivity, so the service life is short and the price is expensive, which is not conducive to popularization.
In addition, it was reported that organophosphorus pesticides were used to form phosphoperoxide with stronger oxidation ability to develop a chemiluminescence-enhanced pesticide detection sensor. However, this enhanced detection method has poor sensitivity and selectivity.
At present, there is no literature report on the chemiluminescence-enhanced sensor composed of the principle of surface coordination to inhibit free radical scavenging, and no one has been involved in the detection of pesticide residues.

Method used

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  • Chemical luminescence enhanced type method for detecting pesticide residues
  • Chemical luminescence enhanced type method for detecting pesticide residues
  • Chemical luminescence enhanced type method for detecting pesticide residues

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Embodiment Construction

[0025] Now use 99% ethanol as a free radical scavenger and magnetic Fe 3 o 4 Nanoparticles are taken as an example and non-limiting examples are described as follows:

[0026] 1. Magnetic Fe 3 o 4 Preparation of nanoparticles

[0027] Co-precipitation method reported in reference L.Z.Gao et al, Nat.Nanotech., 2007, 2, 577.

[0028] Add 10 μL of HCl into 20 mL of deionized water, pass nitrogen to remove oxygen for 30 minutes, then add 2.4 g of FeCl 2 4H 2 O and 4.6 g FeCl 3 ·6H 2 O, after ultrasonic dissolution, it was filtered and transferred to 80 mL of deionized water passed through nitrogen to remove oxygen, and a nitrogen atmosphere was maintained. Subsequently, 10 mL of ammonia water was added dropwise to the above solution, and the solution quickly turned yellow, and the color gradually deepened, and then turned black. After the dropwise addition was completed, the temperature of the system was raised to 40° C. for 0.5 hours of reaction, and then the temperature...

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Abstract

The invention discloses a chemical luminescence enhanced type method for detecting pesticide residues, comprising the following steps of: preparing zymoid active particles and establishing a luminol chemical luminescence system, wherein the chemical luminescence enhancement is realized by adding organic phosphorus pesticide sample containing at least one phosphorus-sulfur single bond and having a series of concentrations and a free-radical scavenger into a zymoid active particle solution; then, adding a chemical illuminant, namely a luminol solution, wherein the chemical luminescence intensity of the obtained mixture is obviously enhanced compared with that of a blank in which the equal amount of the free-radical scavenger is added only at the moment; and accordingly, determining a linear relation between a sample concentration and the chemical luminescence intensity. According to the method disclosed by the invention, a principle of inhibiting the removing of free radicals by surface coordination is firstly utilized to design a chemical luminescence enhanced type sensor, which can be used for sensitive detection of a special pesticide component. Taking organic phosphorus pesticide ethoprophos as an example, the linear range is 0.1-1000 nmol / L and 1-100 micromoles / liter and the detection limit is 0.1 nmol / L.

Description

1. Technical field [0001] The present invention relates to an analysis method of agrochemicals, in particular to a chemiluminescence analysis and detection method of traces of agrochemicals, in particular to a chemiluminescence enhanced detection method developed using the principle of surface coordination to inhibit free radical scavenging methods of pesticide residues. 2. Background technology [0002] As an important means of agricultural production, pesticides play an irreplaceable role in preventing and controlling crop diseases, insects, and weed damage, ensuring agricultural harvests, and promoting the development of high-yield, high-quality, and efficient modern agriculture. However, the uncontrolled use of pesticides has posed a serious threat to the ecological environment, food safety and human health, and has also become one of the focuses of international trade disputes. Since the content of pesticide residue components in actual samples is often very small and ...

Claims

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Application Information

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IPC IPC(8): G01N21/76
Inventor 张忠平关贵俭
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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