Rapid and quantitative detection method of paraffin doped in lard

A detection method, paraffin wax technology, applied in measuring devices, material analysis through electromagnetic means, instruments, etc., can solve the problems of large solvent consumption, long detection time, cumbersome operation, etc., and achieve low cost of detection and analysis, short time consumption, The effect of high detection efficiency

Inactive Publication Date: 2017-06-30
BEIJING RES CENT FOR AGRI STANDARDS & TESTING
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Problems solved by technology

The paraffin extraction weighing method and GC-MS method can accurately and quantitatively detect the paraffin content in animal fat samples, but it needs liquid-liquid extraction pretreatment, consumes a large amount of solvent, and the detection time is long; Fourier transform infrared spectroscopy also requires Pre-saponification and other processes, the operation is cumbersome

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  • Rapid and quantitative detection method of paraffin doped in lard
  • Rapid and quantitative detection method of paraffin doped in lard
  • Rapid and quantitative detection method of paraffin doped in lard

Examples

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Embodiment 1

[0033] This Example 1 provides a rapid detection method for paraffin doped in lard, specifically for qualitative analysis to determine whether there is paraffin doped in 1 case of commercially available lard and 2 cases of self-made paraffin-doped lard samples randomly selected, The detection process is as follows:

[0034] (1) Detect the relative ratios of carbon stable isotopes in 1 case of commercial lard and 2 cases of self-made paraffin-doped lard samples selected at random 13 C / 12 C, using the following formula to calculate the δ of its carbon stable isotope 13 C value:

[0035]

[0036] in,( 13 C / 12 c) 标准样品 is 1.11797×10 -2 .

[0037] The specific operation is as follows: Melt the sample to be tested into a liquid state in a water bath at 85°C, and vortex and stir for 30 minutes to mix evenly, draw 0.3mg into a tin cup, squeeze out the air in the tin cup, and place it in the element analyzer. The sample is to be tested in the sample tray; the sample to be t...

Embodiment 2

[0048] This Example 2 provides a quantitative detection method for doping paraffin in lard. The specific process is: on the basis of Example 1, calculate the paraffin content X of the self-made lard sample 1 doped with paraffin and the self-made lard sample 2 doped with paraffin w .

[0049] Detect and calculate the relative ratio of carbon stable isotopes of 10 paraffin waxes with different refining degrees from at least 5 manufacturers 13 C / 12 C, respectively calculate its δ 13 C value.

[0050] The specific operation process is the same as the detection operation process of the commercially available lard samples.

[0051] 10 stable isotope δ of paraffinic carbon including at least 2 refining grades from 5 manufacturers 13 The detection results of the C value are shown in Table 3 below.

[0052] The paraffin δ of 5 different manufacturers different specifications of table 3 embodiment 2 13 The test result of C value

[0053]

[0054] Based on the above test resu...

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Abstract

The invention discloses a rapid and quantitative detection method of paraffin doped in lard. According to the detection method, through detection on 13C/12C values of a to-be-detected sample and paraffin-undoped lard in the existing database, and a delta 13C value of the to-be-detected sample is calculated and comparatively analyzed to judge whether the to-be-detected sample is doped with the paraffin; on the basis, the paraffin content of the to-be-detected sample can be calculated according to a formula. By virtue of a significant difference between 13C/12C values of carbon stable isotopes of the lard and the paraffin, the purpose of rapidly detecting whether the to-be-detected sample is doped with the paraffin is achieved, and a result is real; in addition, the amount of the doped paraffin can be quantitatively detected, and a quantitative analysis result is reliable; with the detection method provided by the invention, the defects of the conventional detection method of the paraffin doped in the lard can be overcome, the detection efficiency is high, the batch detection can be achieved, the detection analysis cost is low, the detection result is not significantly different from that obtained in the conventional detection method, the result is credible, the pollution to a detection instrument is small and the application prospect is wide.

Description

technical field [0001] The invention relates to the technical field of food detection methods, in particular to a rapid and quantitative detection method for paraffin doped in lard. Background technique [0002] Food adulteration has seriously damaged the economic interests of consumers, and may even endanger life and health. In recent years, in order to reduce the cost and increase the hardness of the oil, criminals have illegally added paraffin to the animal oil. This phenomenon has been repeatedly exposed by different media, and its nature is bad. It has gradually attracted the attention of consumers and relevant law enforcement agencies. Paraffin is an important petroleum product. It is a mixture of saturated alkanes. It is almost colorless and tasteless. However, excessive intake of paraffin can cause digestive system diseases. Chinese regulations and standards prohibit adding any form of paraffin to food. Only food-grade paraffin is allowed to be used as a release age...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62
CPCG01N27/62
Inventor 李安潘立刚张秀彤靳欣欣梁刚满燕
Owner BEIJING RES CENT FOR AGRI STANDARDS & TESTING
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