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Grease oxidation degree fast detection method and testing box

A technology of oil oxidation and detection method, which is applied in the direction of analyzing the material through chemical reaction and material analysis through observing the influence on the chemical indicator, which can solve the problems of poor stability and repeatability, slow separation of oil layer color layer, Long color development time and other issues, to achieve the effects of reducing pollution, low use and operation costs, and conducive to on-site operation

Inactive Publication Date: 2015-10-28
BEIJING SUNPU BIOCHEM TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the biggest disadvantage of the Kreis test is that it cannot be quantified. An important factor for this reason is that it is difficult to obtain consistent test results between various laboratories. Different personnel operate, or the color of the same personnel may have differences in two operations. , so it has only been used as a qualitative method so far, so it has been mostly used in qualitative
[0008] Invention patent "method and test kit for rapid detection of oil oxidation degree" (publication number 104048960A) by adding 1,1,3,3-tetraethoxypropane to realize the quantification of oil oxidation degree (calculated by malondialdehyde content) However, in this method, the traditional operation method of the Kreis test is used, and there are defects such as poor stability and repeatability, long color development time, and slow separation of the color development layer of the oil layer.

Method used

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  • Grease oxidation degree fast detection method and testing box

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1) Oil sample

[0042] 1# oil sample: fresh soybean oil

[0043] 2# oil sample: edible soybean oil to be tested

[0044] 3# oil sample: edible soybean oil to be tested

[0045] 4# oil sample: edible soybean oil to be tested

[0046] 2) Reagent

[0047] A test solution: concentrated hydrochloric acid (37%, about 12mol / L)

[0048] B test solution: phloroglucinol ethanol solution (0.1%)

[0049] C test solution: for A test solution

[0050] 3) Preparation of colorimetric card / colorimetric reference solution

[0051]Add a certain amount of 1,1,3,3-tetraethoxypropane to 1# oil sample to prepare MDA standard oil samples containing MDA 0, 2.5ppm, 5ppm, take 5ml of the above oil samples respectively , in the test tube, add 1.0ml of test solution A, shake for 30 times, add 5.0ml of test solution B and shake for 30 times, let stand for 10min to develop color, then add 4.0ml of test solution C (test solution A), shake Shake for 10 times and let it stand for 1 min to obtain...

Embodiment 2

[0061] 1) Oil sample

[0062] 5# oil sample: fresh peanut oil

[0063] 6# oil sample: edible peanut oil to be tested

[0064] 7# oil sample: edible peanut oil to be tested

[0065] 2) Reagent

[0066] A test solution: sulfuric acid solution (50%, about 18mol / L)

[0067] B test solution: phloroglucinol methanol solution (0.1%)

[0068] 3) Preparation of colorimetric card / colorimetric reference solution

[0069] Add a certain amount of 1,1,3,3-tetraethoxypropane to 5# oil sample to prepare MDA standard oil samples containing MDA 0, 2.5ppm, 5ppm, take 2ml of the above oil samples respectively , in a 15ml cuvette, add 20 drops of test solution A, shake for 30 times, add 3ml of test solution B and shake for 30 times, let it stand for 10 minutes to develop color, and obtain 0ppm, 2.5ppm and 5ppm of malondialdehyde respectively. The colorimetric reference solution, according to the color printing color card of supernatant solution gained color is as follows table: (color refere...

Embodiment 3

[0080] 1) Oil sample

[0081] 5# oil sample: fresh peanut oil

[0082] 6# oil sample: edible peanut oil to be tested

[0083] 7# oil sample: edible peanut oil to be tested

[0084] 2) Reagent

[0085] A test solution: sulfuric acid solution (50%, about 18mol / L)

[0086] B test solution: phloroglucinol methanol solution (0.1%)

[0087] C test solution: water

[0088] 3) Preparation of colorimetric card / colorimetric reference solution

[0089] Add a certain amount of 1,1,3,3-tetraethoxypropane to 5# oil sample to prepare MDA standard oil samples containing MDA 0, 2.5ppm, 5ppm, take 2ml of the above oil samples respectively , in a 15ml cuvette, add 20 drops of test solution A, shake for 30 times, add 3ml of test solution B and shake for 30 times, let stand for 10min to develop color, then add 2ml of test solution C, shake for 10 times, Leave standstill 1min, obtain respectively the colorimetric reference solution that contains malondialdehyde 0ppm, 2.5ppm, 5ppm, print the ...

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Abstract

The invention relates to a grease oxidation degree fast detection method and a grease oxidation degree fast detection testing box prepared on the basis. The method is based on a Kreis test, namely the color development reaction of grease oxidation secondary decomposed products and phloroglucinol. By adjusting the ratio of an added acid solution to an added phloroglucinol solution, reaction speed can be greatly increased, color development stability can be greatly improved, and the defect that an existing test is not stable is overcome. The layering speed is greatly increased, a clarified and transparent colorimetric layer can be fast obtained, and interference of oil sample contrast color is reduced. Besides, the concentration of the acid solution in use can be greatly reduced, operation is safer, and pollution of waste to the environment is reduced.

Description

technical field [0001] The invention relates to a rapid detection technology for the oxidation degree of oil, in particular to a rapid detection method and a test box for the oxidation degree of oil. Background technique [0002] Oil oxidation is an important aspect that compromises oil safety. Affected by factors such as source and storage, oils and fats tend to undergo oxidation and rancidity reactions, and the peroxides produced by them will gradually affect body tissues, destroy cell membrane structures, and cause problems such as anemia, liver and kidney abnormalities, and lethargy; the produced derivatives ( Aldehydes) will reduce appetite and cause diarrhea; in addition, cross-linking reactions between proteins and secondary oxidation products will reduce the digestion and absorption of proteins. [0003] The ability to quickly detect the oxidation degree of oil is of great significance for the actual procurement and quality control of oil. [0004] At present, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 潘咏梅蒙雪艳裴双秀胡文静张慧明
Owner BEIJING SUNPU BIOCHEM TECH
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