Method for detecting deltamethrin in strawberry based on gold nanoparticle surface Raman enhancement

A surface Raman-enhanced, deltamethrin technology, applied in Raman scattering, measurement devices, instruments, etc., can solve problems such as the need for further improvement of the detection limit of the method, poor method accuracy and stability, etc. Simple, high detection accuracy

Inactive Publication Date: 2018-10-02
ZHEJIANG UNIV
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Problems solved by technology

Although the above research can use surface-enhanced Raman spectroscopy to achieve the purpose of enhancing the signal of pesticide molecules in agricultural products, it cannot fully remove the influence of matrix substances, the detection limit of the method needs to be f

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  • Method for detecting deltamethrin in strawberry based on gold nanoparticle surface Raman enhancement
  • Method for detecting deltamethrin in strawberry based on gold nanoparticle surface Raman enhancement
  • Method for detecting deltamethrin in strawberry based on gold nanoparticle surface Raman enhancement

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Embodiment Construction

[0032] The present invention will be described in detail below in conjunction with the embodiments and accompanying drawings, but the present invention is not limited thereto.

[0033] according to figure 1 Shown flow chart, the method for detecting deltamethrin in strawberry in the present embodiment comprises the following steps:

[0034] Step 1. Weigh 10 g of strawberry samples into a 50 mL centrifuge tube, add 10 mL of acetonitrile and 5 g of sodium chloride in sequence, shake well, vortex and mix for 1 min, and then centrifuge at 10,000 r / min for 2 min to obtain a red supernatant.

[0035] Step 2: Take 2mL of the green supernatant and put it into a 15mL centrifuge tube filled with anhydrous magnesium sulfate, propylethylenediamine, C18 and graphitized carbon black, vortex and oscillate for 1min, then centrifuge at 10000r / min After 2 minutes, the supernatant was passed through a 0.22 μm organic filter membrane, and then used as the test solution for later use.

[0036] I...

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Abstract

The invention discloses a method for detecting deltamethrin in strawberries based on gold nanoparticle surface Raman enhancement. The method comprises the following steps: 1, uniformly mixing strawberries with a deltamethrin pesticide with acetonitrile and sodium chloride, and sequentially carrying out vortex oscillation and centrifugation so as to obtain supernate; 2, mixing anhydrous magnesium sulfate, propyl-ethylenediamine, C18 and graphitized carbon black with the supernate, and sequentially carrying out vortex oscillation, centrifugation and filtering so as to obtain a liquid to be tested; 3, preparing a gold nanoparticle sol substrate; 4, uniformly mixing the gold nanoparticle sol substrate, the liquid to be tested and a sodium chloride solution, and carrying out Raman spectrum acquisition; 5, according to equations, calculating residues of the deltamethrin pesticide in the strawberries. By adopting the deltamethrin pesticide residue detection method disclosed by the invention,a rapid, cheap, simple, convenient and accurate detection scheme is provided for pesticide residue detection.

Description

technical field [0001] The invention relates to the technical field of plant pesticide residue detection, in particular to a method for detecting deltamethrin in strawberries based on gold nano surface Raman enhancement. Background technique [0002] Red-faced strawberry seedlings (also known as red-cheeked strawberry, Japan No. 99, red-cheeked) are the largest strawberry series planted in the market at present. The red-faced strawberry has a strong growth potential, a tall plant (25 cm), a large plant diameter, and the ability to produce new stems Medium, large and thick leaves, light green petiole, slightly red base sheath, thick stolon, medium pumping ability, thick peduncle, one large and one small two complete leaves on the branches. Deltamethrin is a benzimidazole derivative, which is a systemic broad-spectrum fungicide. It is widely used in the prevention and treatment of red spider mites, aphids, and grubs in strawberries. Long-term contact or accidental ingestion ca...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 何勇蔺磊董涛聂鹏程肖舒裴瞿芳芳
Owner ZHEJIANG UNIV
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