Method for measuring melamine content in liquid example

A technology for melamine and liquid samples, applied in the field of detection, can solve problems such as insufficient sensitivity and inability to test melamine, and achieve the effects of simple pretreatment, fast measurement, and less sample consumption

Inactive Publication Date: 2009-07-22
CHINESE ACAD OF INSPECTION & QUARANTINE
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Raman spectroscopy can quickly and conveniently test the characteristic spectrum of melamine, but the sensitivity of ordinary Raman spectroscopy is not high enough to accurately test melamine in liquid samples such as milk and eggs

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  • Method for measuring melamine content in liquid example
  • Method for measuring melamine content in liquid example
  • Method for measuring melamine content in liquid example

Examples

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Embodiment Construction

[0026] For further illustrating the present invention, specifically set forth in conjunction with the following examples:

[0027] 1. Instrument

[0028] Test equipment: portable Raman spectrometer (Inspector Raman TM 1.3; DeltaNu Inc., Laramie, Wyoming, USA), 17cm×12cm×6.5cm, weighing 2.3kg, equipped with a NuScopeTM USB microscope (DeltaNuInc., Laramie, Wyoming, USA) with 100× magnification. In addition, it includes weighing balances, ultrasonic instruments, oscillators, centrifuges, vacuum solid phase extraction (SPE) multi-channel instruments, vacuum pumps, nitrogen blowing instruments, and pipette guns.

[0029] Test consumables: gold nanoparticle substrate ( gold nanosubstrates; D3technologies Ltd, Hampshire, UK), on a 25mm×75mm standard microscope glass plate, there is a 6mm×10mm gold-plated area, of which 4mm×4mm is the SERS active area of ​​the etched gold nanoparticles, and the other is the non-etched The eclipsed SERS inactive region. During the test, the sol...

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Abstract

A method for measuring the content of melamine in a liquid sample uses a portable Raman spectrometer (SERS) based on gold nano-particle substrates to measure Raman spectrum for the liquid sample through pretreatment. The method for measuring the content of melamine in a liquid sample in the invention is convenient, sensitive, quick and practical, has simple pretreatment, quick (including pretreatment and detection and being finished in 30min, particularly capable of being finished in 2min in Raman enhanced spectrum detection) and sensitive measurement, and is applicable to field high-flux detection; and the method is portable, needs few consumption of sample, and can be qualitative and quantitative.

Description

technical field [0001] The invention relates to a detection method, in particular to a method for determining the content of melamine in a liquid sample. Background technique [0002] Although melamine (2,4,6-triamino-1,3,5-triazine) itself is not a carcinogen, if illegal large doses of melamine are mixed in dairy products, it will likely lead to urinary stones, acute kidney disease failure, and even infant death, as in the 2007 incidents of melamine contamination in pet feed in the United States and in September 2008 in infant formula in China. Therefore, it is urgent to establish a rapid and accurate on-site detection method. [0003] Since the characteristic peak of the ultraviolet absorption spectrum of melamine is below 240nm, when the ordinary ultraviolet absorption detection method detects melamine, it is easily affected by the solvent and the sample matrix, resulting in inaccurate test results. Moreover, when traditional testing methods, such as HPLC-DAD, LC / MS / MS,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65G01N1/34
Inventor 董益阳程艳白桦王军兵
Owner CHINESE ACAD OF INSPECTION & QUARANTINE
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