Direct chemical ionization mass spectrometry detection method for illegal cooking oil

A technology of mass spectrometry detection and chemical ionization, applied in the field of detection, can solve the problems of inconvenient, time-consuming, and cumbersome operation steps in the detection of waste oil, and achieve the effect of improving the cumbersome detection operation steps

Inactive Publication Date: 2011-07-20
NANCHANG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods generally have defects such as cumbersome operation steps and time-consuming, which bring a lot of inconvenience to the detection of waste oil.

Method used

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  • Direct chemical ionization mass spectrometry detection method for illegal cooking oil
  • Direct chemical ionization mass spectrometry detection method for illegal cooking oil
  • Direct chemical ionization mass spectrometry detection method for illegal cooking oil

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0021] The mass spectrometer used in the embodiments of the present invention is the LTQ-XL linear ion trap mass spectrometer of Finnigan Company of the United States, and the data processing system is the Xcalibur data processing system of Finnigan Company of the United States.

[0022] Under the optimized experimental parameters, the fingerprints of waste oil and camellia oil were recorded in negative ion mode, such as figure 1 shown. From figure 1 It can be seen that the signals with significant intensity are mainly concentrated in the mass range m / z 50-200, and after amplifying the signal intensity by a certain factor, fewer ion peaks can be seen above m / z 200. Because oil samples have higher viscosity, molecules with higher mass are not easily desorbed, and analytes with significa...

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Abstract

The invention discloses a direct chemical ionization mass spectrometry detection method for illegal cooking oil, which is characterized by comprising: (1) setting a linear trap quadrupole mass spectrometry (LTQ-MS) in an anionic or cationic detection mode, regulating a spectrometric detection scanning range, an ionization voltage and a capillary temperature, and setting the parameters of a desorption atmospheric chemical ionization (DAPCI) source; and (2) directly dripping an oil sample on a glass slide, uniformly coating, processing all spectral data into a matrix X by using a mass to charge ratio as an independent variable and the absolute abundance of a mass spectrum peak as a dependent variable, importing the matrix X into data statistic analysis software, directly performing principal component analysis (PCA) computation, and inputting the result of the computation into SIGMAPLOT for graphic display. In the invention, the method which can quickly detect and identify illegal cooking oil without pretreating a sample to be detected overcomes the drawbacks of complex and time-consuming detection operation steps and the like.

Description

technical field [0001] The invention belongs to the technical field of detection, in particular to a detection method of waste oil. Background technique [0002] Waste oil, also known as swill oil and swill oil, mainly comes from the following sources: oil obtained through simple processing and extraction of catering waste oil; oil that is reused directly or with some fresh oil added after frying oil has been used more than the specified number of times; inferior pork, animal Oil produced by processing viscera and skin. The heavy metals and toxins in waste oil are seriously over the standard. Long-term intake will cause cell function failure, induce various diseases, and even cause cancer. Unscrupulous speculators use edible oil mixed with waste oil in food, which is difficult to distinguish from the appearance and sense, causing great harm to society and food safety. [0003] At present, the commonly used detection methods include high performance liquid chromatography, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/64
Inventor 罗丽萍陈焕文张丽丽方小伟郭夏利郇延富张兴磊
Owner NANCHANG UNIV
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