Method for rapidly detecting edible oil added with illegal cooking oil
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A technology for waste oil and edible oil, applied in material excitation analysis, fluorescence/phosphorescence, etc., can solve problems such as poor reproducibility of results, poor universality, and failure to meet the requirements of waste oil detection
Inactive Publication Date: 2012-08-22
NINGXIA UNIVERSITY
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Problems solved by technology
Some people try to detect such indicators as sodium dodecylbenzenesulfonate and cholesterol in waste oil, but these methods are not universally applicable
Some people also use gas-mass spectrometry to identify individual components in waste oil, but the reproducibility of the results is poor
All current detection methods do not meet the requirements for the detection of waste oil due to limitations of one kind or another.
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Embodiment 1
[0028] The method that the present invention adopts is as follows:
[0029] 1. The instrument used: F-4600 Shimadzu fluorescence spectrophotometer;
[0030] 2. Instrument test conditions:
[0031] 3D fluorescence scanning mode;
[0032] Excitation start wavelength: 200.0nm
[0033] Excitation stop wavelength: 700.0nm
[0034] Emission start wavelength: 210.0nm
[0035] Emission stop wavelength: 710.0nm
[0036] Sampling interval: 5.0nm
[0037] Scan rate: 2400nm / min
[0038] Slit width: 10.0nm
[0039] 3. Preparation of waste oil:
[0040] After collecting swill from restaurants, restaurants, hot pot restaurants, small restaurants and other dining places, first filter it to remove impurities such as vegetable leaves and sediment; then wash it twice with an equal amount of tap water, let it stand for stratification, discard the water layer, and Oil layer to remove salt; finally, put the oil layer in a stainless steel pot and heat and stir for 40 minutes, the temperatur...
Embodiment 2
[0048] Scan the ethanol layer in the obtained No. 3 test tube (70% waste oil) with a fluorometer in a three-dimensional fluorescence mode. The test conditions are as shown in 2 in Example 1, and the rest are the same as in Example 1.
[0049] Such as figure 2 As shown, the highest fluorescence intensity of 70% waste oil reaches 800 in this embodiment.
Embodiment 3
[0051] Scan the ethanol layer in the obtained No. 9 test tube (10% waste oil) with a fluorometer in a three-dimensional fluorescence mode. The test conditions are as shown in 2 in Example 1, and the rest are the same as in Example 1.
[0052] Such as image 3 As shown, the highest fluorescence intensity of 10% waste oil reaches 3000 in this embodiment.
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Abstract
The invention relates to a method for rapidly detecting edible oil added with illegal cooking oil. The method is characterized in that the method comprises the following steps of: using organic solvent or water to extract oil to be detected, taking an organic layer or a water layer, using a fluorospectrophotometer to scan images in a three-dimensional fluorescent mode to obtain three-dimensional fluorescence spectrogram data, using data processing software to process the spectrogram data into a contour map which can be analyzed, reading the maximum fluorescence peak intensity and position of the map and comparing with the maximum peak intensity and position of pure edible oil to judge whether the illegal cooking oil is added into the oil to be detected or not. Proven by several tests, the spectral fingerprint method provided by the invention is a proper method for identifying the illegal cooking oil. On one hand, the overall characteristics of the illegal cooking oil can be obtained by using a fingerprint technique. On the other hand, the existence of the illegal cooking oil can be conveniently and accurately judged through measured values. Even though a little of illegal cooking oil is added into the edible oil, the existence of the illegal cooking oil can be accurately and clearly reflected by the map and the values.
Description
technical field [0001] The invention relates to a method for rapidly detecting cooking oil mixed with waste oil. Background technique [0002] The so-called "waste oil" usually refers to the collective designation of various low-quality oils and waste oils in people's daily life. Generally speaking, gutter oil can be roughly divided into three categories: one is gutter oil in a narrow sense, that is, the greasy floating matter in the sewer or the leftovers and leftovers collected by the catering industry (also called swill oil, or swill oil) , or bath water) oil that has been simply processed and refined, because the oil has passed through the sewer, so it is called gutter oil; the second is the oil produced after processing and refining inferior animal meat, animal viscera, and animal skin; It is the oil used for frying food after it has been used more than the specified requirements, and then it is reused or added some new oil to it and reused. Waste oil is mixed into ed...
Claims
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