Method for fast detecting residual acetamiprid in fruit peel

A technology of acetamiprid and fruit peel, applied in the field of physical application, can solve the problems of organic pollutants on the surface, interference signals, complex nano-silver method, etc., and achieve the effect of clean surface, simple operation process and low cost

Active Publication Date: 2016-09-21
HEFEI UNIV OF TECH
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Problems solved by technology

[0002] The existing method for detecting whether the pesticide content on the surface of the peel is qualified is mainly liquid phase mass spectrometry. In recent years, there have been reports on the preparation of nano-silver by the sol aggregation method and the detection of re

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  • Method for fast detecting residual acetamiprid in fruit peel
  • Method for fast detecting residual acetamiprid in fruit peel
  • Method for fast detecting residual acetamiprid in fruit peel

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Embodiment 1

[0029] The surface-enhanced Raman spectrum substrate used in this embodiment is a nano-silver particle film substrate, which is prepared as follows: the glass substrate is placed in the vacuum chamber of the vacuum coating equipment, and the vacuum is evacuated until the pressure is lower than 10 -3 Pa, heating the silver wire to prepare a silver film with a thickness less than 10nm on the glass substrate.

[0030] This embodiment takes apples as an example, and introduces in detail the method for detecting residual acetamiprid in apple peels:

[0031] Step 1. Establishment of SERS standard spectral lines

[0032] (1) Take an apple that does not contain acetamiprid in the peel as a standard apple, and measure its quality as M 0 kg(M 0 =0.235); Wrap the surface of the standard apple with plastic wrap, and use the drainage method to measure its volume as V 0 mL(V 0 =271mL); Calculation obtains the surface area S of standard apple 0 :

[0033] (2) Dissolve 0.10g of pestic...

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Abstract

The invention discloses a method for fast detecting residual acetamiprid in fruit peels. The method is characterized in that a surface enhanced Raman spectrometry (SERS) is used for building an SERS standard spectral line of the maximum acetamiprid residual quantity, conforming to the food security national standard GB2763-2014, of fruit to be detected; the fruit peels of the fruit to be detected are detected for obtaining the SERS spectral line of the fruit to be detected; the obtained SERS spectral line is compared with the SERS standard spectral line for judging whether the acetamiprid content in the fruit peels of the fruit to be detected conforms to the food security national standard or not. The method has the characteristics that the pretreatment on the fruit is not needed; no damage is caused on detecting samples; the operation process is simple; the field detection can be realized; the consumption is low, and the like. The detecting method has universality, and can be used for detecting other pesticides or toxic substances on the surfaces of vegetables and fruits with smooth surfaces through proper modification.

Description

technical field [0001] The invention relates to a method for rapidly detecting acetamiprid residues on fruit surfaces based on Raman spectroscopy, and belongs to the technical field of physical applications. Background technique [0002] The existing method for detecting whether the pesticide content on the surface of the peel is qualified is mainly liquid phase mass spectrometry. In recent years, there have been reports on the preparation of nano-silver by the sol aggregation method and the detection of residual acetamiprid on the surface of the apple peel by using the surface-enhanced Raman spectroscopy (SERS) method. However, the preparation of nano-silver by sol-condensation method is complicated, and the surface contains organic pollutants, which generate interference signals. [0003] Nano-silver film has the advantages of large specific surface area and high surface activity, and because of its surface plasmon properties, it can enhance the Raman spectrum of the subst...

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 方应翠曲锴尤江李欢欢盛翔刘晓阳
Owner HEFEI UNIV OF TECH
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