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Method for detecting overheating treatment of vegetable oil, and use of method

A technology of overheating and vegetable oil, applied in the field of food safety, can solve problems such as adverse human health

Inactive Publication Date: 2017-08-04
SHENYANG PHARMA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the oil is consumed, especially for a long time or in large quantities, it is very harmful to human health

Method used

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  • Method for detecting overheating treatment of vegetable oil, and use of method
  • Method for detecting overheating treatment of vegetable oil, and use of method
  • Method for detecting overheating treatment of vegetable oil, and use of method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Take 100 μL of corn germ oil sample with a pipette gun, add 400 μL of deuterated chloroform, shake well, put it into an NMR tube, and test 1 H-NMR spectrum. 1 H-NMR spectrum measurement method: time domain 32K, 90 pulse time: 14.4μs, spectral width: 20ppm, relaxation: 1s, signal detection time: 4.09s, number of scans per free induction decay: 8, number of virtual scans: 8 . Chemical shifts are in ppm, using deuterated chloroform (CDCL3) as solvent and 1% tetramethylsilane (TMS, d=0) as internal standard. 1 H-NMR spectrum data processing: application Bruker TOPSPIN 2.1 software, in 1 In the H-NMR spectrum, the phase is adjusted, and TMS, d=0 is used for calibration. Test result: not found in 1 In the H-NMR spectrum, the characteristic signal of aldehyde group hydrogen appears between δH=9.0 and 10.0 in the low field region (see figure 2 A).

Embodiment 2

[0055] Take 150mL of the same corn germ oil as in Example 1, heat and stir at a constant temperature of 170° C. for 2 hours to obtain heating oil.

[0056] Use a pipette gun to take 100 μL of a sample of corn germ oil that has been heated and stirred at 170 °C for 2 hours, add 400 μL of deuterated chloroform, shake well, put it into an NMR tube, and test 1 H-NMR spectrum. 1 H-NMR spectrum determination method: time domain 32K, 90 pulse time: 14.4μs, spectral width: 20ppm, relaxation: 1s, signal detection time: 4.09s, number of scans per free induction decay: 640, number of virtual scans: 2 . Chemical shifts are in ppm, using deuterated chloroform (CDCL3) as solvent and 0.1% tetramethylsilane (TMS, d=0) as internal standard. 1 H-NMR spectrum data processing: using Bruker TOPSPIN2.1 software, in 1 In the H-NMR spectrum, the phase is adjusted, and TMS, d=0 is used for calibration. Test results: found in 1 In the H-NMR spectrum, the characteristic signal of aldehyde group hyd...

Embodiment 3

[0058] Take 150 mL corn germ oil same as in Example 1, heat and stir at 170° C. for 2 hours, add 0.3 g of activated carbon, stir in a water bath at 40° C. for 30 minutes to decolorize, and filter with suction (a layer of diatomaceous earth is spread on the filter paper). The heated decolorized oil is obtained.

[0059] Use a pipette gun to take 400 μL of corn germ oil sample that has been heated and stirred at 170°C for 2 hours and decolorized, add 40 μL of deuterated chloroform, shake well, put it into an NMR tube, and test 1 H-NMR spectrum. 1 H-NMR spectrum determination method: time domain 32K, 90 pulse time: 14.4μs, spectral width: 20ppm, relaxation: 1s, signal detection time: 4.09s, number of scans per free induction decay: 64, number of virtual scans: 64 . Chemical shifts are in ppm, using deuterated chloroform (CDCL3) as solvent and 0.1% tetramethylsilane (TMS, d=0) as internal standard. 1 H-NMR spectrum data processing: application Bruker TOPSPIN 2.1 software, in 1...

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Abstract

The invention relates to a method for detecting overheating treatment of vegetable oil, and use of the method in the field of edible oil. The method is specifically characterized by comprising the steps of taking 100mu L of an oil sample, adding 400mu L of deuterated chloroform into the oil sample, taking tetramethylsilane (TMS) as internal standard, wherein d is equal to 0, testing 1 <1>H-nuclear magnetic resonance (1H-NMR) spectrum, and taking an aldehyde-group hydrogen characteristic signal (the characteristics of which are as shown in E and F in figure 1) as the proof of the detected vegetable oil being subjected to the overheating treatment, wherein the signal appears when delta H in the 1H-NMR spectrum is equal to 9.0-10.0. After the method is adopted, gutter oil can be simply and rapidly detected.

Description

technical field [0001] The invention belongs to the field of food safety, and in particular relates to a method for detecting overheating of vegetable oil and its application in the field of edible oil. Background technique [0002] Vegetable oil is a compound composed of unsaturated fatty acid and glycerol. It is widely distributed in nature and is obtained from the fruit, seed, and germ of plants, such as: corn germ oil, peanut oil, soybean oil, sesame oil, sunflower oil, etc. Vegetable oil is the main oil consumed by people. It can provide essential fatty acids that the human body cannot synthesize. However, some unscrupulous traders, in order to reduce costs and make huge profits, refine waste oil and mix it with fresh edible vegetable oil, which seriously endangers the health of consumers. . [0003] Waste oil in a broad sense refers to all kinds of discarded low-quality edible oils, mainly kitchen waste oils, and also includes a type of animal fats produced after proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08
CPCG01N24/08
Inventor 黄健王金辉
Owner SHENYANG PHARMA UNIVERSITY
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