Bifunctional material for latent fingerprint physical development and mass spectrum detection matrix as well as preparation method and application of bifunctional material

A dual-functional material and mass spectrometry detection technology, which is applied in the field of nanomaterial preparation technology and analysis and detection, can solve problems such as background interference, single function of developer, signal interference, etc., to promote separation, improve electron tunneling efficiency, and strong electrostatic adsorption The effect of action

Pending Publication Date: 2022-04-15
山东政法学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, there have been more and more studies on the visualization of latent fingerprints using mass spectrometry imaging technology, but only the imaging of latent fingerprints on specific substrates has been realized, and the detection of latent fingerprints at crime scenes has not achieved good results. The main influencing factors are Including several aspects: (1) The addition of latent fingerprint developer causes signal interference during chemical detection, (2) Background interference of conventional organic matrix materials in the low mass region (m / z<1000) during mass spectrometry detection
Therefore, in order to realize the detection of latent fingerprints at the crime scene, it is very important to develop suitable developers and mass spectrometry detection matrix materials. In addition, the existing developers only have a single function of physical display of latent fingerprints, and it is urgent to develop a multifunctional And will not cause signal interference to mass spectrometry detection

Method used

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  • Bifunctional material for latent fingerprint physical development and mass spectrum detection matrix as well as preparation method and application of bifunctional material
  • Bifunctional material for latent fingerprint physical development and mass spectrum detection matrix as well as preparation method and application of bifunctional material
  • Bifunctional material for latent fingerprint physical development and mass spectrum detection matrix as well as preparation method and application of bifunctional material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for preparing a dual-functional material for physical visualization of latent fingerprints and a mass spectrometry detection matrix, the steps are as follows:

[0042] (1) Zinc nitrate hexahydrate (Zn(NO 3 ) 2 ·6H 2 O), sodium hydroxide (NaOH), trisodium citrate dihydrate (HOC (COONa) (CH 2 COONa) 2 2H 2 O) adding 50ml of deionized water under stirring at room temperature, due to the homogeneous nucleation and growth of ZnO nanostructures, a turbid solution is formed immediately; in the solution, the concentration of zinc nitrate hexahydrate (Zn(NO3) 6H2O) is 0.05M , the concentration of sodium hydroxide is 0.25M, trisodium citrate dihydrate (HOC(COONa)(CH 2 COONa) 2 2H 2 O) the concentration is 0.1M;

[0043] (2) Then add 10ml of 0.01M HAuCl4·4H2O aqueous solution directly into it, stir at room temperature for 12 hours, centrifuge to collect the resulting lavender precipitate, wash it with deionized water and ethanol for 3 times, and finally dry it at ...

Embodiment 2

[0046] The dual-functional material of embodiment 1 is used for the physical manifestation of latent fingerprints, and the specific method is as follows:

[0047] Dip the dual-function material with a soft brush, and gently brush the surface with latent fingerprints. After the outline of the fingerprint first appears, then dip the dual-function material and gently brush it along the direction of the lines, and then use a clean brush to wipe The excess powder in the small furrow is removed until the lines are clear.

[0048] The development effect on latent fingerprints is as follows: figure 2 shown by figure 2 It can be seen that the material has a good effect on developing latent fingerprints, and the structure in the fingerprints is clearly presented. This material is not volatile, and the displayed fingerprints can be retained for a long time. This material is light purple. Due to a certain color contrast, it has a better effect on latent fingerprint analysis on the sur...

Embodiment 3

[0050] The bifunctional material of Example 1 is used as a mass spectrometry detection matrix material, and the specific method is as follows:

[0051] , the concentration of the bifunctional material in the suspension is 20-50 μg / μL, take 1 μL of the suspension and spot it on the MALDI sample target, after natural drying, then take 1 μL fatty acid spot on it, after natural drying, enter the mass spectrometer Perform mass spectrometry.

[0052] Mass spectrometry results such as image 3 shown. Depend on image 3 It can be seen that when this material is used as a mass spectrometry detection matrix, the spectrum is clean without background interference, and the molecular ion peak characteristics of C14:0 fatty acid are obvious, indicating that this material is a good mass spectrometry detection matrix, suitable for the analysis of small molecular compounds in latent fingerprints.

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Abstract

The invention relates to a bifunctional material for latent fingerprint physical development and mass spectrometric detection matrix and a preparation method and application thereof.The bifunctional material is Au (at) ZnO, sheet-shaped materials with the average thickness of 8-12 nanometers are mutually crossed and assembled into a porous hydrangea shape, gold nanoparticles are loaded on the surfaces of the sheet-shaped materials, and the bifunctional material is prepared through a one-pot method. The bifunctional material has the bifunctional properties of latent fingerprint physical development and mass spectrum detection matrix materials, effectively solves the problems of multiple steps, multiple reagents and multiple addition in the latent fingerprint chemical detection process, is economical and efficient, saves the cost, has no background signal interference, provides very good conditions for the chemical analysis of latent fingerprints, and has good application prospects. The limitation of adverse conditions in on-site latent fingerprint mass spectrum imaging is expected to be overcome, and the mass spectrum imaging analysis is realized.

Description

technical field [0001] The invention relates to a dual-functional material for latent fingerprint physical manifestation and mass spectrometry detection matrix, its preparation method and application, and belongs to the field of nanometer material preparation technology and analysis and detection technology. Background technique [0002] Fingerprints are the first evidence to prove a crime and an important basis for personal identification. Latent fingerprints (Latentfingerprints, LFPs) are formed by the residual endogenous and exogenous substances left on the surface of the skin when the finger touches the object. They are invisible to the naked eye and are the most common trace evidence at the crime scene. Their detection is Important research content in the field of forensic science. Most of the crime scenes are incomplete and overlapping fingerprints, and the physical form information is not enough to meet the requirements of individual identification, which has caused ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/16B22F1/054B22F9/24G01N27/64C01G9/02B82Y15/00B82Y30/00B82Y40/00
Inventor 亓英华
Owner 山东政法学院
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