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Quantitative detection method of rapeseed oil doped in edible oil

A quantitative detection method and quantitative detection technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of inapplicable canola oil detection, etc., and achieve the effect of good reliability

Pending Publication Date: 2022-02-08
JIUJIANG UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In GB / T 5539-2008 "Qualitative Test of Grain and Oil Inspection and Fat", the content of erucic acid above 4% indicates the presence of rapeseed oil or mustard oil, but this method is not suitable for the detection of canola oil

Method used

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  • Quantitative detection method of rapeseed oil doped in edible oil
  • Quantitative detection method of rapeseed oil doped in edible oil
  • Quantitative detection method of rapeseed oil doped in edible oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Determination of volatile components of different pure vegetable oils:

[0083] (1) Collect 7 kinds of pure vegetable oils from two different sources: rapeseed oil, camellia oil, peanut oil, rice oil, soybean oil, sunflower oil, sesame oil;

[0084] (2) Accurately weigh 4.00 g of pure vegetable oil sample in a 20 mL brown flat-bottomed headspace solid-phase microextraction bottle, then add 20 μL of 2-methyl-3-heptanone with a concentration of 1 mg / L as an internal standard, and make the internal standard The concentration in the sample solution is 5 μg / kg; among them, the 20mL brown-bottomed headspace solid-phase microextraction bottle needs to be washed and dried in an oven at 250°C for 12 hours before use.

[0085] (3) A TSQ 8000Evo triple quadrupole gas spectrometer (Thermo) with an automatic solid-phase microextraction device was used to analyze the volatile components of the samples.

[0086] The extraction procedure is as follows: the sample is equilibrated at 80...

Embodiment 2

[0090] Using camellia oil as base oil, rapeseed oil with mass percentage of 1%, 2%, 5%, 10%, 20%, 50% and 100% was added, and a standard curve was drawn. The specific operation is as follows:

[0091] (1) Prepare 8 clean beakers and number them;

[0092] (2) Add 100g, 99g, 98g, 95g, 90g, 80g, 50g and 0g camellia oil into corresponding beakers respectively, then add 0g, 1g, 2g, 5g, 10g, 20g, 50g and 100g rapeseed oil, At room temperature, the magnetic stirrer was uniform, and 8 mixed oil samples were obtained;

[0093] (3) 4.00g mixed oil samples are accurately weighed respectively, and the volatile components are detected and analyzed according to the method of Example 1; the peak area C occurring during the record 48.03min retention time 1 and internal standard peak area C 0 , and calculate the peak area C of the isolate cibrene at 48.03min 1 and internal standard peak area C 0 The ratio of C 1 / C 0 ;

[0094] (4) Taking the mass concentration of rapeseed oil as the a...

Embodiment 3

[0098] Using 2 different camellia oils as base oils, 3%, 7% and 11% of 2 different rapeseed oils were added separately, and the mass concentration of rapeseed oil in the oil samples to be tested was calculated. The specific operation is as follows:

[0099] (1) Prepare 3 clean beakers and number them;

[0100] (2) respectively add 97g, 93g and 89g camellia oil A in corresponding beaker, then add 3g, 7g and 11g rapeseed oil A respectively; % rapeseed oil A-tea oil A mixed oil;

[0101] Prepare 3%, 7%, and 11% rapeseed oil A-tea oil B mixed oil, rapeseed oil B-tea oil A mixed oil and rapeseed oil B-tea oil B mixed oil in the same way.

[0102] (3) Accurately weigh 4.00g mixed oil samples respectively, then detect and analyze the volatile components according to the method of Example 1; record the peak area C occurring during the retention time of 48.03min 1 and internal standard peak area C 0 , and calculate the peak area ratio C 1 / C 0 ;

[0103] (4) The calculated peak ...

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Abstract

The invention provides a quantitative detection method of rapeseed oil doped in edible oil, the method comprises the following steps: taking 2-methyl-3-heptanone as an internal standard, quantitatively detecting a characteristic volatile component cembrarene in a sample through SPME-GC / MS, calculating the ratio of the peak area corresponding to the separated matter cembrarene to the internal standard peak area, and calculating the relative content of the rapeseed oil in the sample through the standard curve so that quantitative detection of the content of the rapeseed oil in the sample is achieved. The method has the advantages of good reliability, simplicity, convenience and rapidness, and can relatively accurately analyze the content of the rapeseed oil in the edible vegetable oil and judge whether the edible vegetable oil is adulterated.

Description

technical field [0001] The invention relates to the technical field of edible oil adulteration detection, in particular to a quantitative detection method for edible oil adulterated with rapeseed oil. Background technique [0002] Edible vegetable oil is edible oil made from vegetable oil seeds, including soybean oil, rapeseed oil, peanut oil, sesame oil, sunflower oil, olive oil, camellia oil, etc. Compared with the high content of saturated fatty acids in animal fats, vegetable oils have a higher proportion of unsaturated fatty acids, and do not contain cholesterol, but contain beneficial plant sterols such as stigmasterol and sitosterol, so they are favored by people. [0003] GB 2716-2018 "National Food Safety Standard Vegetable Oil" stipulates that a single variety of edible food oil should not be mixed with other oils. If it is an edible vegetable blend oil, the proportion of various vegetable oils used should be indicated in the label. The process shall also be ident...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06G01N30/72
CPCG01N30/02G01N30/06G01N30/72G01N2030/045G01N2030/062
Inventor 周凯周全军张笑杨建远杨宇燕赖蕾
Owner JIUJIANG UNIVERSITY
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