Method for true and false identification and content determination of sesame oil

A technology of sesame oil and content, which is applied in the direction of nuclear magnetic resonance analysis, etc., to achieve the effect of improving detection speed and accuracy

Inactive Publication Date: 2014-12-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, there is no report on the use of low-field nuclear magnetic resonance technology to determine the adulteration content of sesame oil

Method used

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  • Method for true and false identification and content determination of sesame oil
  • Method for true and false identification and content determination of sesame oil
  • Method for true and false identification and content determination of sesame oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Making mixed oil samples: Mix pure sesame oil and pure soybean oil purchased in supermarkets in different proportions to make 7 mixed oil samples. The volume percentages of soybean oil in sesame oil are 0, 10, 20, 40 , 60, 80, 100%.

[0031] 2) Preparation of test samples: use a pipette gun to take 3ml of mixed oil samples into respective 5ml centrifuge tubes.

[0032] 3) The relaxation spectra of pure sesame oil, pure soybean oil and mixed oils were measured by low-field nuclear magnetic resonance; the parameters of the relaxation spectra: 90-degree pulse width P 1 :4μs, 180 degree pulse width P 2 :8μs, re-sampling waiting time Tw:3500ms, analog gain RG1:[-3.0 to 40, all integers], digital gain DRG1:[0 to 7, all integers], preamplifier gain PRG:[0 to 3 ], the number of repeated sampling NS: 4, 8, 16, the number of echoes NECH: 3500, the receiver bandwidth SW: 100, 200, 300KHz, the control parameter RFD of the start sampling time: 0.002-0.05ms, the delay DL1: 0.1 ...

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Abstract

The invention provides a method for true and false identification and content determination of sesame oil. The method utilizes a low-field nuclear magnetic resonance technique to identify and determine the content of the sesame oil. The method mainly comprises the operation steps that 1, a mixed oil sample is prepared; 2, a detection sample is prepared; 3, relaxation signals of pure sesame oil, pure soybean oil and mixed oil are quickly determined by the low-field nuclear magnetic resonance technique; and 4, signal data is analyzed and processed. The method is easy and simple to operate and good in effect, can achieve quick detection of the content of the sesame oil in the sesame oil and soybean oil mixed sample, is applicable to the field of quality control of the pure sesame oil, and lays a foundation for quality detection work of the sesame oil.

Description

technical field [0001] The invention belongs to the field of quality detection of sesame sesame oil, and relates to a method for realizing authenticity identification and content determination of sesame sesame oil by using low-field nuclear magnetic resonance technology. Background technique [0002] At present, food safety has become the most concerned topic of the people. Due to the high economic value of sesame oil, the phenomenon of adulteration of sesame oil and its detection has always been a problem of concern to the society. Fat adulteration generally involves mixing non-greasy substances or low-priced and low-quality edible oils into high-quality edible oils to profit from them. Research on adulteration detection of sesame oil has made new progress. Although these methods can judge the quality of sesame oil to a certain extent, it is difficult to take into account both the technician's requirements for equipment and instrument operation and the targeted high-level...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08
Inventor 谭明乾王晓玲马小军
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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