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Method for quickly screening and authenticating edible oil through surface assisted laser desorption ionization mass spectrometry

A technology that assists lasers and edible oils is applied in nanotechnology for materials and surface science, material analysis through electromagnetic means, and measurement devices. It can solve problems such as poor accuracy, cumbersome operations, and low detection accuracy, and achieve The detection process is fast, the detection process is simplified, and the effect of high sensitivity

Inactive Publication Date: 2018-12-18
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although sensory and physical and chemical methods are simple and easy to implement, they are poor in accuracy, cumbersome to operate, and cannot be quantified
Instrumental methods (including ultraviolet / visible, infrared, chromatography, chromatographic mass spectrometry, etc.) have the advantages of high sensitivity, good selectivity, and high accuracy. They are currently the main means of edible oil detection. , the detection accuracy is low, or the sample pretreatment process is cumbersome, it needs to consume a lot of organic reagents, and it is easy to cause pollution to the environment, etc.
Therefore, there is currently no suitable method for the rapid screening and identification of edible oils

Method used

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  • Method for quickly screening and authenticating edible oil through surface assisted laser desorption ionization mass spectrometry
  • Method for quickly screening and authenticating edible oil through surface assisted laser desorption ionization mass spectrometry
  • Method for quickly screening and authenticating edible oil through surface assisted laser desorption ionization mass spectrometry

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Embodiment 1

[0037] A method for quickly screening and identifying edible oil by surface-assisted laser desorption ionization mass spectrometry, comprising the following steps:

[0038] Magnetic metal-organic framework nanomaterial matrix Fe 3 o 4 The preparation of @ZIF8 includes the following steps:

[0039] Step 1: Preparation of Fe 3 o 4 Magnetic microspheres: weigh FeCl 3 ·6H 2 O was dissolved in ethylene glycol to obtain a clear solution, followed by the addition of sodium acetate and Na 3 Cit·2H 2 O, stir to dissolve, transfer the obtained homogeneous solution to the reactor; place the reactor in an oven at 200°C, and react for 10 hours; wash the obtained magnetic product with water and ethanol for 4 times, and dry it in vacuum at 30°C. FeCl 3 ·6H 2 O, sodium acetate and Na 3 Cit·2H 2 The mass ratio of O is 1:2:0.5;

[0040] Step 2: Ultrasonic preparation of magnetic metal-organic framework nanomaterials at room temperature: the Fe 3 o 4 Magnetic microspheres and Zn(NO...

Embodiment 2

[0061] Magnetic metal-organic framework nanomaterial matrix Fe 3 o 4 The preparation of @ZIF67 includes the following steps:

[0062] Step 1: Preparation of Fe 3 o 4 Magnetic microspheres: weigh FeCl 3 ·6H 2 O was dissolved in ethylene glycol to obtain a clear solution, followed by the addition of sodium acetate and Na 3 Cit·2H 2 O, stir to dissolve, transfer the obtained homogeneous solution to the reactor; place the reactor in an oven at 200°C, and react for 10 hours; wash the obtained magnetic product with water and ethanol for 4 times, and dry it in vacuum at 30°C. FeCl 3 ·6H 2 O, sodium acetate and Na 3 Cit·2H 2 The mass ratio of O is 1:2:0.5;

[0063] Step 2: Ultrasonic preparation of magnetic metal-organic framework nanomaterials at room temperature: the Fe 3 o 4 Magnetic microspheres and Co(NO 3 ) 2 Add it into the methanol solution, use ultrasonic oscillation to obtain a uniform dispersion of microspheres, add 4 times the amount of methanol solution con...

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Abstract

The invention provides a method for quickly screening and authenticating edible oil through surface assisted laser desorption ionization mass spectrometry. In the method, a magnetic metal organic framework nanomaterial is used as matrix, the magnetic metal organic framework nanomaterial matrix is mixed with the edible oil and dropped on a target plate, and the target plate is dried at room temperature; then, mass spectrometric detection is executed, and a result is analyzed. The method overcomes a lot of problems, such as serious background interference of the conventional organic matrix at alow molecular weight region (m / z is less than 1000 Da), and can be directly used for quick screening and authentication of the edible oil. The method has the advantages of consuming less samples, being simple in sample preparation and fast in analysis, having high signal-to-noise ratio and excellent signal repeatability, and so on, and has better use value and potential application foreground in the food safety field.

Description

technical field [0001] The invention belongs to the field of edible oil detection, and in particular relates to a method for quickly screening and identifying edible oil by using surface-assisted laser desorption ionization mass spectrometry. Background technique [0002] Matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS) is a new type of organic mass spectrometry with high efficiency and soft ionization, and has become one of the indispensable tools for the analysis of biological macromolecules in recent years. MALDI uses laser light to irradiate the sample to form a co-crystal film with the matrix, and then the matrix absorbs energy from the laser and transmits it to biomolecules, while the ionization process transfers protons to biomolecules or obtains protons from biomolecules, thereby ionizing biomolecules, while the whole During the process, biomolecules will not be broken to generate fragmentation peaks, which is suitable for the determination of...

Claims

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Application Information

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IPC IPC(8): G01N27/64B82Y30/00
CPCB82Y30/00G01N27/64
Inventor 林子俺吴杰陈伟建
Owner FUZHOU UNIV
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