Infrared spectrography detection method for animal oil

A technology of infrared spectroscopy and detection method, applied in the field of food inspection and detection, can solve the problems of high cost of infrared spectroscopy and cross-contamination of samples, and achieve the effects of avoiding cross-contamination, simplifying sample processing steps, and being easy to popularize and use.

Inactive Publication Date: 2014-05-28
DALIAN NATIONALITIES UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the technical problems of high cost and easy cross-contamination of samples in the infrared spectrum detection of animal oil in the prior art, the present invention provides a fast, economical, no cross-contamination between samples, and a detection method for more accurately measuring the infrared spectrum of animal oil new method

Method used

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  • Infrared spectrography detection method for animal oil
  • Infrared spectrography detection method for animal oil
  • Infrared spectrography detection method for animal oil

Examples

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Embodiment 1

[0038] Adopt the mensuration of polyethylene film method lard infrared spectrum of the present invention:

[0039] (1) Put the double-layer polyethylene film into the IR light path to deduct the background.

[0040] Due to its simple molecule, polyethylene should have a simple infrared spectrum, and its infrared spectrum is measured as follows figure 1 As shown, the wave number of the infrared spectrum peak is 2914.44cm -1 、2856.58cm -1 、2655.98cm -1 、2358.94cm -1 、1462.04cm -1 、1367.53cm -1 、1085.92cm -1 、721.38cm -1 , the specific peak intensity and peak shape are subject to the spectrum. The infrared spectrum image scanned after the background of the double-layer polyethylene film is buckled figure 2 As shown, the wavenumber of the infrared spectrum peak is 2924.09cm -1 、2850.79cm -1 , the two peaks are very weak, and the light transmittance is above 97%. The specific peak intensity and peak shape are subject to the spectrum.

[0041] (2) Take a small piece of...

Embodiment 2

[0043] Determination of infrared spectrum of butter:

[0044] The measured sample is changed into beef tallow, and other steps are with embodiment 1. Infrared spectra measured as Figure 4 shown.

Embodiment 3

[0046] Determination of sheep oil infrared spectrum:

[0047] The measured sample is changed into sheep oil, and other steps are with embodiment 1. Infrared spectra measured as Figure 5 shown.

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Abstract

An infrared spectrography detection method for animal oil uses a polyvinyl film as an animal oil sample carrier medium for detection, wherein the polyvinyl film meets the condition that in an infrared spectrogram of a double-layered polyvinyl film subjected to background deducting, no absorption peak appears in the range between 4000 cm<-1> and 400 cm<-1>, or in the range between 4000 cm<-1> and 400 cm<-1>, only two absorption peaks of which the light transmittance values are both greater than or equal to 94.0% appear in the range between 2930 cm<-1> and 2845cm <-1>. The method specifically comprises the following steps: placing the double-layered polyvinyl film in an infrared light path to deduct background, and placing the double-layered polyvinyl film sandwiching animal oil into the light path for detection. Compared with a potassium bromide tabletting method, the infrared spectrography detection method for animal oil is better in coincidence, and accurate in spectrogram determination, does not need a detachable liquid pool or a potassium bromide piece with salt windows of potassium bromide and the like, can realize quick and accurate determination of the animal oil infrared spectrogram with low cost, and can avoid cross contamination among samples.

Description

technical field [0001] The invention belongs to the field of food inspection and detection, in particular to an infrared spectrum detection method of animal oil. Background technique [0002] Animal oil is fat extracted from the meat or tissue of animals. Infrared spectroscopic analysis can generally be determined by detachable potassium bromide salt window liquid pool method and potassium bromide tablet method. With the detachable potassium bromide salt window liquid pool method, the salt windows are reused during the measurement process. After use, the surface is generally cleaned with cotton dipped in acetone and dried with dry air. If the cleaning is not thorough, there will still be residues. It is easy for the sample to form multiple contaminations on the salt window, thereby interfering with the determination results of subsequent samples. Using the potassium bromide tablet method, after coating the tablet, put it into the optical path for detection. After detectio...

Claims

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Application Information

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IPC IPC(8): G01N21/3577
Inventor 姜波胡文忠刘长建姜爱丽郑维
Owner DALIAN NATIONALITIES UNIVERSITY
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