Method for recognizing pesticide residues on skin of cucumbers based on near infrared spectroscopic analysis

A near-infrared spectroscopy and pesticide residue technology, applied in the field of identification of pesticide residues on cucumber skin, can solve the problems of low detection accuracy and the inability to carry out qualitative classification and identification of pesticide residues, and achieve the effect of large sample data, guaranteed accuracy, and rich information

Inactive Publication Date: 2019-02-22
LESHAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The existing technology represented by the above-mentioned patent documents can realize the detection of pesticides, but it cannot qualitatively classify and identify the pesticide residues with different concentration gradients on the cucumber epidermis, and the detection accuracy is low.

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  • Method for recognizing pesticide residues on skin of cucumbers based on near infrared spectroscopic analysis
  • Method for recognizing pesticide residues on skin of cucumbers based on near infrared spectroscopic analysis
  • Method for recognizing pesticide residues on skin of cucumbers based on near infrared spectroscopic analysis

Examples

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Embodiment 1

[0042] A method for identifying pesticide residues on cucumber epidermis based on near-infrared spectroscopy, comprising the following steps:

[0043] a. Sample preparation

[0044] Three cucumbers were selected, one of which was not sprayed with pesticides, as a sample without pesticides; the liquid pesticide aviacidamiprid and tap water were selected to form a pesticide aqueous solution of 1:1000 and 1:100, and the other two cucumbers were treated by spraying. Cucumbers were sprayed; cucumbers sprayed with a pesticide concentration of 1:1000 were used as samples containing mild pesticide residues, and cucumbers sprayed with a pesticide concentration of 1:100 were used as samples containing heavy pesticide residues;

[0045] b. Spectral data collection

[0046] After 24 hours of spraying pesticides, pick three cucumber samples for spectral data collection, and take 4mm of interrupted epidermis from each cucumber 2 Make 80 specimens, collect their spectral data respectively,...

Embodiment 2

[0060] A method for identifying pesticide residues on cucumber epidermis based on near-infrared spectroscopy, comprising the following steps:

[0061] a. Sample preparation

[0062] Three cucumbers were selected, one of which was not sprayed with pesticides, as a sample without pesticides; the liquid pesticide aviacidamiprid and tap water were selected to form a pesticide aqueous solution of 1:1000 and 1:100, and the other two cucumbers were treated by spraying. Cucumbers were sprayed; cucumbers sprayed with a pesticide concentration of 1:1000 were used as samples containing mild pesticide residues, and cucumbers sprayed with a pesticide concentration of 1:100 were used as samples containing heavy pesticide residues;

[0063] b. Spectral data collection

[0064] After 24 hours of spraying pesticides, pick three cucumber samples for spectral data collection, and take 4mm of interrupted epidermis from each cucumber 2 Make 80 specimens, collect their spectral data respectively,...

Embodiment 3

[0079] A method for identifying pesticide residues on cucumber epidermis based on near-infrared spectroscopy, comprising the following steps:

[0080] a. Sample preparation

[0081] Three cucumbers were selected, one of which was not sprayed with pesticides, as a sample without pesticides; the liquid pesticide aviacidamiprid and tap water were selected to form a pesticide aqueous solution of 1:1000 and 1:100, and the other two cucumbers were treated by spraying. Cucumbers were sprayed; cucumbers sprayed with a pesticide concentration of 1:1000 were used as samples containing mild pesticide residues, and cucumbers sprayed with a pesticide concentration of 1:100 were used as samples containing heavy pesticide residues;

[0082] b. Spectral data collection

[0083] After 24 hours of spraying pesticides, pick three cucumber samples for spectral data collection, and take 4mm of interrupted epidermis from each cucumber 2 Make 80 specimens, collect their spectral data respectively,...

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Abstract

The invention discloses a method for recognizing pesticide residues on skin of cucumbers based on near infrared spectroscopic analysis and belongs to the field of pesticide residue detection. The method is characterized by comprising the following steps: a, sample preparation; b, spectral data acquisition; c, dimensionality reduction of principal component analysis spectral data; d, spectral dataclassified recognition of a supporting vector machine: S1, generating 150 sample data of a training set and 90 sample data of a testing set; S2, carrying out normalization processing; S3, selecting aGaussian radial base core function to establish a supporting vector machine model; S4, acquiring the supporting vector optimum model of the optimum parameter C and the optimum parameter g by means ofa grid search and cross verification method; and S5, recognizing the normalized training set data by applying the supporting vector machine optimum model, separately, and predicting the testing set data which are normalized. The method can be used for identifying the pesticide residues of different concentrations on skin of cucumbers in a classified manner quantitively, and is high in detection precision.

Description

technical field [0001] The invention relates to the technical field of pesticide residue detection, in particular to a method for identifying pesticide residues on cucumber epidermis based on near-infrared spectrum analysis. Background technique [0002] Cucumber is an annual vine or climbing herb of Cucurbitaceae, also known as pickled cucumber and cucumber. It is favored by the public because it is rich in nutrients such as water, protein, and vitamins, and has the functions of clearing away heat, quenching thirst, diuresis, and reducing swelling. The cucumber planting cycle is long, and it is vulnerable to diseases and insect pests such as downy mildew, powdery mildew, gray mold, bacterial angular spot, and leaf blight. In order to ensure production, melon farmers often spray pesticides frequently, or spray pesticides with excessive concentrations, resulting in pesticide residues on the surface of cucumbers, which not only harms people's health, but also affects the expo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/359
CPCG01N21/359
Inventor 李敏胡丹曹进蒋强
Owner LESHAN NORMAL UNIV
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