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Preparation method of functionalized rare earth long-persistence nanocomposites and its application in latent fingerprint imaging

A technology of nanocomposite materials and nanomaterials, applied in the field of biological analysis and fingerprint detection, can solve the problems of destructive samples, physical damage, unfavorable popularization, etc., and achieve the effect of no background interference

Inactive Publication Date: 2017-06-30
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although fingerprint visualization technology plays an important role in criminal investigation and analytical science, there are still many difficulties in the field of fingerprint visualization
For example, in the traditional method, most of the latent fingerprints need to be referenced to an exogenous substance, and the processing process is cumbersome and destructive to the sample.
The small particle size powder used in the widely used smoke method and brushing method has certain physical damage to the technicians
However, emerging fingerprint technologies such as mass spectrometry and infrared Raman imaging require expensive large-scale instruments and professional operating knowledge, which is not conducive to popularization.

Method used

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  • Preparation method of functionalized rare earth long-persistence nanocomposites and its application in latent fingerprint imaging
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  • Preparation method of functionalized rare earth long-persistence nanocomposites and its application in latent fingerprint imaging

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Experimental program
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Effect test

Embodiment 1

[0022] according to figure 1 The schematic diagram in (a) shows the preparation of biotin-functionalized strontium aluminate rare earth doped long-lasting nanocomposites:

[0023] (1) Strontium aluminate rare earth doped long afterglow nanomaterials were centrifuged at 3000 rpm to take the supernatant, dried in vacuum and then ground, and 1.6 mg of strontium aluminate rare earth doped long afterglow nanomaterials were dispersed in absolute ethanol and ultrasonically mixed , add a mixed solution of 222 μL ethanol, 247 μL deionized water, and 6.7 μL tetraethyl orthosilicate, sonicate for 5 min, add 25 μL ammonia water (28%-30%), sonicate for 30 min, and stir magnetically at 1200 rpm for 7.5 h. After centrifugation, they were washed with ethanol three times and dried in vacuum at 36 °C to prepare silica-coated strontium aluminate rare earth-doped long-lasting nanomaterials.

[0024] (2) Disperse the material prepared in step (1) in 2 mL N,N-dimethylformamide (DMF) and ultrasonic...

Embodiment 2

[0030] Application of latent fingerprint imaging of biotin-functionalized strontium aluminate rare earth-doped long-lasting nanocomposites: fingerprints were collected on a glass slide, 100 μL of a certain concentration of rabbit anti-lysozyme polyclonal antibody was dropped on the latent fingerprint, and incubated at room temperature for 30 minutes , through the specific recognition of antigen / antibody, the rabbit anti-lysozyme polyclonal antibody binds to the lysozyme on the fingerprint ridge, and the fingerprint sample after incubation is immersed in PBS buffer solution with pH 7.4 and gently shaken and washed twice. Remove non-specifically bound antibodies and blow dry with argon. Drop a certain concentration of biotin-labeled donkey anti-rabbit IgG 100 μL on the surface of the fingerprint, incubate for 30 minutes, and bind the biotin-labeled donkey anti-rabbit IgG through the specific binding of rabbit anti-lysozyme polyclonal antibody to donkey anti-rabbit IgG. to the su...

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Abstract

The invention discloses a preparation method of a functionalized rare earth long-lasting nanocomposite material and its application in latent fingerprint imaging, belonging to the technical field of biological analysis and fingerprint detection. Avidin was modified to the surface of amino-functionalized strontium aluminate rare earth doped long-lasting nanomaterials to prepare avidin-functionalized rare-earth long-lasting nanocomposites, and then using the recognition function between biotin and avidin, the Avidinylated rare earth long-persistence nanocomposites attached to latent fingerprints labeled with biotinylated antibodies. The strontium aluminate rare earth doped long afterglow nanomaterial has long afterglow characteristics, and after being irradiated by a light source and removed, it still keeps emitting light, which can realize latent fingerprint imaging. The method of the invention is fast, simple and has no background interference.

Description

technical field [0001] The invention discloses a preparation method of a functionalized rare earth long-lasting nanocomposite material and its application in latent fingerprint imaging, belonging to the technical field of biological analysis and fingerprint detection. Background technique [0002] Latent fingerprints are fingerprint lines formed by the transfer of natural body secretions such as sweat, which are difficult to detect visually and are the most common fingerprints at crime scenes. According to incomplete statistics from various places in my country, among the criminal cases solved by the police, more than 70% are solved by using fingerprints, and the proportion is increasing year by year. Under normal circumstances, fingerprints are the most direct physical evidence left by criminals at the scene. Therefore, research on the display technology of latent fingerprints is an important link to improve the collection rate and utilization rate of fingerprint physical e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/64C09K11/02A61B5/1172
Inventor 梁汝萍邱伟斌邱建丁
Owner NANCHANG UNIV
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