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Peanut oil adulteration qualitative identification method

A technology of peanut oil and grease, applied in the field of chemical analysis and detection, can solve the problems of expensive equipment, limited wide application, immature research of NMR method, etc., and achieve the effect of maintaining interests

Inactive Publication Date: 2015-05-06
INST OF OIL CROPS RES CHINESE ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the detection accuracy of the physical and chemical index detection method has been questioned by all parties; the gas chromatography detection time is long and the instrument is expensive, which limits its wide application; the near-infrared spectroscopy method is accurate and non-destructive, but requires a large number of samples for modeling and detection costs. Relatively expensive; NMR research is not mature enough, and expensive equipment increases the difficulty of promotion

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  • Peanut oil adulteration qualitative identification method
  • Peanut oil adulteration qualitative identification method
  • Peanut oil adulteration qualitative identification method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of samples: 73 samples of peanuts, 17 samples of soybeans, and 78 samples of rapeseed were collected from different varieties and different regions, and pure peanut oil, pure soybean oil and rapeseed oil were obtained through the same pressing method; commercially available palm oil was also prepared 1, 8 cottonseed oils; and respectively add 5%, 10%, 15%, 20%, 25%, 30% (mass fraction) soybean oil, rapeseed oil, cottonseed oil, palm oil to peanut oil successively to obtain blending 24 pseudo-peanut oils;

[0027] Weigh 30mg vegetable oil samples respectively, extract with isopropanol / acetonitrile / n-hexane mixed solvent (2 / 2 / 1; V / V / V), use methanol / isopropanol (1 / 1, V / V) mixed solution Dilute 1000 times, filter with a 0.22 μm organic filter membrane, and wait for liquid chromatography-mass spectrometry to inject and analyze;

[0028] Liquid chromatography analysis conditions: chromatographic column is Thermo Scientific Hypersil GOLD C18 column (150*2.1mm, 3μ...

Embodiment 2

[0045] Weigh 30mg of peanut oil sample No. 22, extract with isopropanol / acetonitrile / n-hexane mixed solvent (1 / 1 / 1; V / V / V), use methanol / isopropanol (1 / 1, V / V) The mixed solution was diluted 1000 times, filtered with a 0.22 μm organic filter membrane, and then analyzed by liquid chromatography-mass spectrometry;

[0046] Liquid chromatography analysis conditions: chromatographic column is Thermo Scientific Hypersil GOLD C18 column (150*2.1mm, 3μm); mobile phase a is isopropanol, b is acetonitrile, gradient elution: 0-5min, 10% a , 90% b (by volume percentage); 5-20min, 59% a, 41% b (by volume percentage); 20-25min, 10% a, 90% b (by volume percentage); flow rate is 250 μ L / min; the injection volume is 10 μL;

[0047] Mass spectrometry conditions: ion source: atmospheric pressure chemical ionization source; acquisition mode: atmospheric pressure chemical ionization source positive ion; scanning method: data-dependent secondary scanning; acquisition range: m / z 100~1200; ion sou...

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Abstract

The invention relates to a method for analyzing tri-acylglycerol composition in oil, and a peanut oil adulteration identification method. The method for analyzing the tri-acylglycerol composition in oil comprises the following steps: extracting a to-be-identified oil sample to obtain lipid components, diluting, filtering, and injecting into a reverse phase liquid chromatography-mass spectrometer for analysis; and deriving a chromatography-mass spectrogram, and analyzing a total ion current chromatogram, a primary mass spectrogram and a secondary mass spectrogram to obtain the content of tri-acylglycerol components. The peanut oil adulteration identification is performed based on the content of the tri-acylglycerol components in the sample. Adulterated peanut oil can be identified effectively and qualitatively based on the tri-acylglycerol composition in the to-be-identified oil sample, the detection limit is up to 5%, and adulteration can be effectively prevented to maintain the benefit of consumers; and the peanut oil adulteration qualitative identification method is suitable for application and popularization in the technical field of vegetable oil adulteration identification.

Description

technical field [0001] The invention belongs to the field of chemical analysis and detection, and in particular relates to a qualitative identification method for peanut oil adulteration. Background technique [0002] Contain the materials useful to human body such as sterol, wheat germ phenol, phosphatide, vitamin E, choline in peanut oil. Often edible peanut oil, can prevent that wrinkled skin is aging, and protection vascular wall, prevents thrombosis, contributes to prevention of arteriosclerosis and coronary heart disease. Choline in peanut oil can also improve the memory of human brain and delay brain function decline. The price of peanut oil in the market is significantly higher than other common edible oils such as soybean oil, rapeseed oil, palm oil, cottonseed oil, etc. In order to reduce production costs, many unscrupulous traders often mix lower-priced edible oils with peanut oil to make huge profits. Therefore, detection of peanut oil adulteration has become a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/89
Inventor 王秀嫔李培武刘优钱张奇丁小霞张文张良晓
Owner INST OF OIL CROPS RES CHINESE ACAD OF AGRI SCI