SERS-based magnetic test paper for detecting nitrite as well as preparation method and use method thereof

A technology of nitrite and nitrite, applied in the direction of measuring devices, instruments, and material analysis through optical means, can solve the problems of time-consuming, cumbersome process, unfavorable on-site detection, etc., and achieve wide application prospects, easy to carry, Excellent SERS performance and magnetic effect

Active Publication Date: 2018-07-24
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] At present, the detection methods of nitrite mainly include redox titration, spectrophotometry, fluorescence photometry, atomic absorption spectrometry, chromatography, etc., but these detection methods have disadvantages such as cumbersome process, time-consuming, and not conducive to on-site detection.

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  • SERS-based magnetic test paper for detecting nitrite as well as preparation method and use method thereof
  • SERS-based magnetic test paper for detecting nitrite as well as preparation method and use method thereof
  • SERS-based magnetic test paper for detecting nitrite as well as preparation method and use method thereof

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[0023] The present invention will be further described below in conjunction with accompanying drawing:

[0024] Such as Figure 1-Figure 3 A SERS-based magnetic test paper for detecting nitrite is shown, including a superhydrophobic film, self-assembled gold nanorods standing on the surface of the superhydrophobic film, and magnetic composites interspersed between the gold nanorods. SERS is the English abbreviation of Surface-enhanced Raman scattering, and the Chinese meaning is surface-enhanced Raman scattering. In the magnetic test paper of the present invention, the gold nanorods are vertically arranged and self-assembled into an array on the surface of the superhydrophobic film, and the maximum electromagnetic enhancement will be generated at the top of the gold nanorods, so that the magnetic test paper has excellent SERS enhancement performance . On the surface of the superhydrophobic film, the magnetic complex (Fe 3 o 4 / TiO 2 / Au NRs) are surrounded by gold nanorod...

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Abstract

The invention relates to SERS-based magnetic test paper for detecting nitrite as well as a preparation method and a use method thereof. The magnetic test paper comprises a super-hydrophobic film, goldnanorods and a magnetic composite, wherein the gold nanorods are erected on the surface of the super-hydrophobic film in bundles after self-assembling; the magnetic composite is entrained among the gold nanorods. The gold nanorods and the magnetic composite are self-assembled on the surface of the super-hydrophobic material to form the magnetic test paper with excellent SERS property. 4-amino thiophenol adsorbed on the surface of the magnetic test paper is coupled with to-be-detected nitrite, and an SERS signal of a coupling product is utilized, so that quantitative and qualitative detectionon the nitrite is conducted indirectly. The magnetic test paper prepared by the method is corrosion-resistant and staining-resistant, has excellent SERS property and magnetism, is convenient to carry,can be rapidly separated out of a complex system under the action of an external magnet, and has wide application prospect in on-site, rapid and high-sensitivity detection on the nitrite in complex samples such as food, environments and biological samples.

Description

technical field [0001] The invention relates to the technical field of nitrite detection, in particular to a SERS-based magnetic test paper for detecting nitrite and a method for preparing and using the same. Background technique [0002] Nitrite is an unstable intermediate product of the nitrogen cycle, can be found everywhere in the natural environment, and is widely used in industry, construction and food processing. Studies have pointed out that nitrite has certain toxicity, carcinogenicity and teratogenicity, and excessive consumption can be fatal. Nitrite itself is not carcinogenic, but it can react with various amino compounds under cooking or other conditions and convert it into nitrosamines, which are carcinogens. After nitrite enters the blood, it combines with the hemoglobin in the human body, deforms the normal hemoglobin, loses its oxygen-carrying capacity, causes hypoxia in human tissue, and dilates blood vessels. [0003] Nitrite is a common food additive in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65G01N33/543
CPCG01N21/658G01N33/54326
Inventor 郭红燕王儒敬赵爱武张正勇陈翔宇汪六三鲁翠萍魏圆圆黄河
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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