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Method for detecting veterinary drugs in water based on cadmium telluride quantum dots

A technology for cadmium telluride quantum dots and water detection, which is applied in measurement devices, material excitation analysis, fluorescence/phosphorescence, etc., can solve the problems of complicated operation, expensive instruments, and high reagent costs, and achieves the effect of high sensitivity

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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to improve the shortcomings of the traditional veterinary drug detection method, such as high false positives, poor repeatability, complicated operation, expensive equipment, high reagent cost and high maintenance cost, and fill in the shortcomings of fluorescent semiconductor quantum dots in the application of veterinary drug detection, and provide a Method for detecting veterinary drugs in water based on cadmium telluride quantum dots

Method used

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  • Method for detecting veterinary drugs in water based on cadmium telluride quantum dots
  • Method for detecting veterinary drugs in water based on cadmium telluride quantum dots
  • Method for detecting veterinary drugs in water based on cadmium telluride quantum dots

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 1. Synthesis of NAC-CdTe (574nm)

[0031] First, weigh 0.0681g NaBH 4 Add 2 mL of water to the seed bottle, add Te powder (0.0957 g,), after sealing, connect with a needle to release the generated H 2 . Put the strain bottle at room temperature to react until a clear and transparent solution (6-8h) can be used for injection.

[0032] Then, weigh 0.3426g CdCl 2 2.5H 2 O was added to the four-necked flask, and 75mL of water was added. After fully dissolving, 0.3679g of N-acetyl-L-cysteine ​​(NAC) was weighed and dissolved in 10mL of water and slowly dropped into the four-necked flask. The sulfhydryl group in NAC and Cd + Alignment is instant. The pH was adjusted to 9 with 5M NaOH. Pass N 2 After 30 minutes, the oil bath was heated, and the temperature was set to 98°C. After the temperature stabilized, draw the above-prepared NaHTe solution with a syringe, and quickly inject it into the four-neck bottle. NAC-CdTe quantum dot solutions emitting green, yellow and r...

Embodiment 2

[0035] (1) The yellow-emitting (575 nm) NAC-CdTe quantum dot solution prepared in Example 1 was centrifuged and purified into a NAC-CdTe solution with a concentration of 10 μg / mL.

[0036] (2) Prepare malachite green solutions with concentrations of 0, 18, 36, 54, 72, 90, 108, 126, 144, 162, 180, 198, 225 μM, and add a series of malachite green solutions with known concentrations above In the NAC-CdTe solution that step (1) prepares, measure the variation of its fluorescence intensity with the variation law of malachite green solution concentration (see Figure 5 Left), the results show that the fluorescence intensity decreases along with the increase of the malachite green solution concentration; according to the fluorescence intensity of the detected solution, the relationship between the fluorescence intensity and the concentration of the malachite green solution is established (see Figure 5 right).

[0037] From the above test results, it can be seen that malachite green...

Embodiment 3

[0040] (1) The quantum dot powder obtained by centrifuging and purifying the yellow light-emitting (575 nm) NAC-CdTe quantum dot solution prepared in Example 1 was prepared into a NAC-CdTe solution with a concentration of 100 μg / mL.

[0041] (2) The pefloxacin solution with a concentration of 0, 71, 142, 213, 284, 355, 497, 675, 852, 994 μM is prepared, and the pefloxacin solution of the above-mentioned series of known concentrations is added to the step (1 ) in the NAC-CdTe solution prepared, measure the fluorescence intensity of the NAC-CdTe quantum dot solution of different concentrations of pefloxacin solutions with a fluorescence spectrophotometer, and evaluate the ratio relationship between the pefloxacin concentration and the fluorescence intensity. Image 6 It is the detection result of pefloxacin. As the concentration of pefloxacin increased from 0 to 9.94 μM, the fluorescence intensity of NAC-CdTe quantum dots gradually decreased ( Image 6 (left)), in Image 6 (Ri...

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Abstract

The invention discloses a method for detecting veterinary drugs in water based on cadmium telluride quantum dots. The method comprises the following steps: preparing water-soluble N-acetylcysteine (NAC) modified CdTe quantum dot powder with different wavelengths; preparing an NAC-CdTe quantum dot solution; adding a series of veterinary drug solutions with known concentrations into the prepared NAC-CdTe quantum dot solution, and establishing a relationship between the fluorescence intensity and the concentrations of the veterinary drug solutions according to the detected fluorescence intensity of the solutions; and adding a solution to be detected into the prepared NAC-CdTe quantum dot solution, detecting the fluorescence intensity of the solution to be detected, and determining the concentration of the veterinary drug solution in the solution to be detected based on the relationship between the fluorescence intensity and the concentration of the veterinary drug solution. According to the present invention, the veterinary drugs such as malachite green, pefloxacin, chloramphenicol and the like in water are detected based on the NAC-CdTe quantum dots, such that advantages of simpleness, rapidness, high sensitivity and the like are provided, and the important significance is provided for the detection of the veterinary drug residues in aquatic products and environments.

Description

technical field [0001] The invention relates to a method for detecting veterinary drugs in water based on cadmium telluride quantum dots. Background technique [0002] The use of veterinary drugs is necessary in modern agriculture to prevent devastating losses from large-scale pests and diseases. However, the use of a large number of veterinary drugs has brought about the problem of veterinary drug residues in aquatic products and the environment. The occurrence of many diseases is directly related to food safety to a large extent. The residues of veterinary drugs in aquatic products and the environment not only endanger the health of the general public, but also affect the export of agricultural products and aquatic products in our country. These residues pose risks to human health, such as cancer, birth defects, disrupted hormone function, and more. As people pay more and more attention to environmental protection and food safety, many countries in the world have promulg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/6402G01N21/6428
Inventor 陈苏李阁李浩李鹤
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