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Graphite-structured nanomaterials with controllable surface chemical functional groups and their preparation methods and applications in mass spectrometry

A technology of graphite structure and nanomaterials, applied in nanotechnology for materials and surface science, material analysis through electromagnetic means, graphite, etc., can solve the problems of sensitive detection of small molecules and difficulties in precise imaging, and achieve the realization of tissue slices Effects of mass spec imaging, changing enzyme activity, and simplifying sample handling

Active Publication Date: 2020-01-17
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although they can overcome the background interference of traditional organic matrices in the low-molecular-weight region, sensitive detection and precise imaging of small molecules in vivo are difficult.

Method used

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  • Graphite-structured nanomaterials with controllable surface chemical functional groups and their preparation methods and applications in mass spectrometry
  • Graphite-structured nanomaterials with controllable surface chemical functional groups and their preparation methods and applications in mass spectrometry
  • Graphite-structured nanomaterials with controllable surface chemical functional groups and their preparation methods and applications in mass spectrometry

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preparation example Construction

[0050] The present invention also provides a preparation method of graphite-structured nanomaterials, comprising:

[0051] Place two graphite rods as anode and cathode respectively in deionized water for electrolysis to obtain unreduced graphite points;

[0052] React unreduced graphite dots with sodium borohydride to obtain graphite-structured nanomaterials;

[0053] Wherein, the dosage ratio of the unreduced graphite dots to the sodium borohydride is 100 mg: (13-17) mmol.

[0054] According to the present invention, the present invention places two graphite rods respectively as anode and cathode in deionized water for electrolysis to obtain unreduced graphite points; wherein, the voltage of the electrolysis is preferably 30V; the time of the electrolysis is preferably 12 ~14 days; during the electrolysis process, it is preferable to keep high-intensity stirring continuously; the present invention also preferably filters and centrifuges the obtained graphite dots to obtain u...

Embodiment 1

[0067] The preparation of embodiment 1 graphite structure type nanomaterial

[0068] The initial graphitic dots were obtained by electrochemical corrosion. First, two graphite rods (99.99%, AlfaAesar Co.Ltd) were inserted into deionized water in parallel, one was used as an anode and the other was used as a cathode, while ensuring that the static voltage between the two poles was 30V. The whole electrolysis process lasted for two weeks, and continued Maintain high-intensity magnetic stirring, and then produce the most initial graphite points. However, the graphite dot solution at this time is also mixed with large graphite particles, so it needs to be filtered and high-speed centrifuged (22000rpm, 30min) to obtain the unreduced graphite dots with uniform particle size and very good water solubility used in the final experiment ( Denoted as GD1).

[0069] The graphite point (GD-1) 100mg that takes by weighing is dissolved in 100ml water, then adds an appropriate amount of sod...

Embodiment 2

[0072] Example 2 MALDI-TOF MS detection of graphite dots (GD-2) as a matrix

[0073] 1) The MALDI-MS analysis and detection process uses a Bruker Ultraflex III TOF / TOF mass spectrometer equipped with a 355nm Nd:YAG laser. Its reflection positive and negative ion modes and tandem mass spectrometry were used in the detection. The drop sample method used is mainly the two-layer method. First, the graphite dot solution (1 μL, 1 mg / mL) is dropped on the MALDI target plate, and dried naturally at room temperature to form a matrix layer, and then the sample to be analyzed (1 μL ) was dropped on the matrix layer to fully crystallize the sample and graphite points, and then dried at room temperature and sent to the MALDI MS vacuum chamber for detection.

[0074] Specifically, firstly, the mass spectrometry detection of the pure matrix was carried out without adding any analyte, and the results are shown in Figure 4 , Figure 4 It is the background noise of GD-2 and traditional matr...

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Abstract

The invention provides a graphite structure type nano-material, and a preparation method and an application thereof. Functional groups modified on the surface of the graphite structure type nano-material are epoxy groups, carbonyl groups and hydroxyl groups; and 100% of carbon-carbon bonds, the carbonyl groups, the epoxy groups and the hydroxyl groups on the surface of the graphite structure typenano-material comprise 55-65% of the carbon-carbon bonds, 10-16% of the carbonyl groups, 0.5-1.5% of the epoxy groups and 21-31% of the hydroxyl group. A graphite dot is applied to MALDI-MS detectiontechnology as an ideal matrix, so the bottleneck that small molecules cannot be detected is successfully solved, and sensitive detection and tissue slice mass spectrometry imaging of small molecules are realized. Additionally, the graphite dot also provides a new way for changing the enzyme activity and characterizing enzyme kinetics.

Description

technical field [0001] The invention relates to the field of biochemical detection, in particular to a graphite-structured nanomaterial with controllable surface chemical functional groups, a preparation method thereof, and an application in mass spectrometry. Background technique [0002] Matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS) is a soft ionization technique that has achieved great success in the rapid analysis of biological macromolecules (nucleic acids, proteins, peptides, etc.) and polymers. Over the past 30 years, matrix-assisted laser desorption ionization mass spectrometry has shown high efficiency in the ionization of large molecules, and a large number of organic molecules (CHCA, DHB, etc.) have become the main matrix of choice for this technique. However, in matrix-assisted laser desorption ionization mass spectrometry, the traditional organic matrix will generate high background noise when the mass-to-charge ratio of the mass spect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/21G01N27/62B82Y30/00
Inventor 刘坚石瑞康振辉李灏刘阳黄慧吴恩慧吕蕊
Owner SUZHOU UNIV
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