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Method for detecting quality of edible oil by using hydrogen-nuclear magnetic resonance spectroscopy

A technology of hydrogen nuclear magnetic resonance spectrum and edible oil, which is applied in the field of nuclear magnetic resonance spectrum detection and identification of edible oil quality, can solve the problems of complex and changeable components, and cannot explain the composition clearly, so as to simplify the experimental steps, reduce the workload and improve the accuracy high effect

Active Publication Date: 2012-08-15
HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the problem of the source of waste oil, its composition is complex and changeable, and even producers cannot explain its composition, which is an unchangeable characteristic

Method used

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  • Method for detecting quality of edible oil by using hydrogen-nuclear magnetic resonance spectroscopy
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  • Method for detecting quality of edible oil by using hydrogen-nuclear magnetic resonance spectroscopy

Examples

Experimental program
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Effect test

preparation example Construction

[0032] 3. Preparation of test samples

[0033]Take 20 microliters of soybean oil, add 0.6mL CDCl 3 dissolved in Φ 5mm sample tube to get the sample solution to be tested. According to this method, 14 parts of soybean oil, 14 parts of peanut oil, 12 parts of sesame oil, 7 parts of palm oil, 6 parts of corn oil, 7 parts of cottonseed oil, 7 parts of rapeseed oil, 7 parts of sunflower oil and 8 parts of blended oil were obtained.

[0034] 4. Test process

[0035] 1. Spectrometry

[0036] Determination conditions: temperature: 295K, CDCl 3 For internal locking, each spectrum is scanned 16 times, the spectrum width is 20ppm, the pulse interval is 2s, and the pulse sequence is zg30.

[0037] The sample solution prepared above was measured on the nuclear magnetic resonance instrument 1 H NMR spectrum to obtain the free decay signal (FID signal) of the sample.

[0038] 2. Spectrum processing and integration

[0039] The FID signal of the sample obtained from the above measure...

Embodiment 1

[0091] Example 1 Discrimination of edible oil by direct use of integral area through two-dimensional graph

[0092] The standard sample was tested and integrated by proton nuclear magnetic resonance spectrum according to the above method. It was found through experiments that only soybean oil and rapeseed oil had No. 9 peak among common edible oils. The two-dimensional plane diagram made by using the integral values ​​A and C, as attached figure 2 And attached image 3 , as the standard database.

[0093] It can be seen from the accompanying drawings that various oils can be completely separated. The oils to be tested are tested and integrated by proton nuclear magnetic resonance spectrum according to the above method, and the integrated values ​​A and C are compared with the established standard database for judgment.

[0094] For example, we add 5% waste oil sample to rapeseed oil and carry out H NMR spectrum test and integration according to the above method, and the o...

Embodiment 2

[0101] Example 2 Discrimination of grease by direct use of integral area through three-dimensional graph

[0102] The standard sample is tested and integrated by proton nuclear magnetic resonance spectrum according to the above method. Using the integrated values ​​A, C, and E to make a three-dimensional map, various edible oils can be completely separated, as shown in the attached Figure 6 , as the standard database.

[0103] The edible oil to be tested was tested and integrated by proton nuclear magnetic resonance spectrum according to the above method, and its integral value A, C, E was used to compare with the standard database attached Figure 6 Compare and judge. For example

[0104] Table 21 The integral data of two peanut oil samples containing 10% waste oil are as follows

[0105] A B C D E F G H I 1.91 1.00 0.62 1.43 2.23 1.97 12.57 0.00 1.99 1.87 1.00 0.68 1.50 2.27 2.07 12.28 0.00 1.60

[0106] I...

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Abstract

The invention discloses a method for detecting the quality of edible oil by using hydrogen-nuclear magnetic resonance spectroscopy, and belongs to the field of food detection methods. The method comprises the following steps of: performing nuclear magnetic resonance signal acquisition on oil samples of different qualities under the same parameters, integrating the acquired maps, calculating data such as content and iodine value of various fatty acids such as saturated fatty acid, oleic acid and linoleic acid by using the integrating value, and finding the characteristics of different oil; performing repeated test on the oil sample of the same quality; establishing an oil quality test database according to the test data of the oil of different qualities, and forming an analysis and test standard; and finally, performing quality identification on an unknown oil sample through the test data in the database. The method is easy to operate, has the advantages of high accuracy, high repeatability, fastness, economical efficiency and the like, is applied to identification and detection of pure edible oil or doped edible oil, and can be used for identifying the category of the edible oil.

Description

technical field [0001] The invention belongs to the field of food detection methods, and in particular relates to a method for detecting and identifying the quality of edible oil by nuclear magnetic resonance spectrum. Background technique [0002] With the rapid development of the tertiary industry, the scale of my country's catering industry is expanding day by day, and the waste oil discharged from the catering wastewater is increasing day by day. Criminals illegally recycle and refine these waste oils, and toxic "waste oil" returns to the dining table. Harmful to human health. Waste oil generally includes swill oil, old frying oil and waste animal fat. Regarding the rapid detection of waste oil, there are several types of technologies or methods on the market. There are paper layers based on the detection of electrical conductivity and the total amount of polar compounds. Rapid detection methods such as analysis, thin-layer chromatography, sensors, etc., there are also r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08
Inventor 王强余学军李中贤梁志宏郭晓河
Owner HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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