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Rapid detection method for oxidation degree of grease and testing box

A grease oxidation and test box technology, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problems of unstable results, application limitations, and many influencing factors. Achieve the effect of easy popularization and application and low detection cost

Active Publication Date: 2014-09-17
BEIJING SUNPU BIOCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the Kreis test, there are many factors affecting the determination process, the results are unstable, and there is no corresponding quantitative standard, that is, the color produced by it cannot be equivalent to the corresponding oxidation degree, especially for feed oils, which usually have different degrees of oxidation. In this way, its application is greatly limited, and so far this method has only been used for qualitative determination; especially with the rapid development of instrument detection and the continuous improvement of detection requirements, this method has been gradually withdrawn.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Oil sample to be tested: Peanut oil in bulk at the farmer’s market

[0053] Test solution: hydrochloric acid (38%), phloroglucinol ethanol solution (0.1%).

[0054] A method for rapidly detecting the oxidation degree of grease, comprising the following steps:

[0055] 1) Select a blank oil sample;

[0056] Blank oil sample: commercially available fresh non-oxidized edible peanut oil, the lower layer of the product detected by this method is colorless to light yellow.

[0057] 2) prepare reference solution;

[0058] Reference solution: Weigh 0.315g of 1,1,3,3-tetraethoxypropane (content 97%), add blank oil sample to 100g, mix well and leave for 1 hour (this is equivalent to containing Malondialdehyde 1mg). Accurately weigh 0, 0.02, 0.05, 0.10, 0.20g of the above oil sample and add the blank oil sample to 100g to obtain a reference solution, then the corresponding MDA content in the obtained reference solution is 0, 0.02, 0.05, 0.1 , 0.2mg / 100g.

[0059] 3) Pipette ...

Embodiment 2

[0063] A test box for quickly detecting the oxidation degree of oil, comprising a test solution, a colorimetric cup and a colorimetric card, used for determining the content of malondialdehyde in the oil sample to be tested, or determining the range of the content of malondialdehyde in the oil sample to be tested; Determine the degree of oxidation of the oil sample to be tested within a certain range.

[0064] The oil sample to be tested, the blank oil sample, the test solution, the reference solution and the color development method are the same as in Example 1.

[0065] Preparation of the color comparison card (A): the reference color comparison solution is obtained after developing the color of the reference solution. According to the obtained color of the lower layer of the reference colorimetric solution, print the corresponding color card, and each color corresponds to the content of malondialdehyde in the reference solution.

[0066] Preparation of color comparison car...

Embodiment 3

[0070] A test box for quickly detecting the oxidation degree of oil, including a test solution, a colorimetric cup and a limit reference solution, which is used for the detection of oil samples with specified acceptance standards. If the malondialdehyde content in the oil sample to be tested is greater than 0.2mg / 100g, it is unqualified.

[0071] The oil sample to be tested, the blank oil sample, the test solution and the color development method are the same as in Example 1.

[0072] Preparation of limit reference solution: Weigh 0.315g of 1,1,3,3-tetraethoxypropane (content 97%), add blank oil sample to 100g, mix and place for 1 hour (this is equivalent to Contains malondialdehyde 1mg). Accurately weigh 0.20g of the above oil sample and add the blank oil sample to 100g to obtain a limit reference solution, then the obtained limit reference solution is equivalent to a content of MDA of 0.20mg / 100g. Store the prepared limit reference liquid in a sealed place at low temperatu...

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PUM

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Abstract

The invention relates to a rapid detection method for oxidation degree of grease and a rapid testing box for oxidation degree of grease prepared on the basis of the rapid detection method. Based on a Kreis test, namely chromogenic reaction of an oil oxidation secondary decomposition product and phloroglucinol, malondialdehyde is introduced as a quantitative indicator, and 1,1,3,3-tetraethoxypropane is added into a blank oil sample as a reference solution for carrying out quantitative detection on oxidation degree of grease. The rapid detection method and the rapid testing box provided by the invention overcome the defect of unstable coloration as the Kreis test is affected by personnel, a container, operation, samples and the like, solve the quantitative problem of the Kreis test, are easy and convenient to operate, and beneficial to field operation, and detection results are rapidly obtained. In addition, the cost is low, thus being beneficial to promotion.

Description

technical field [0001] The invention relates to a detection technology for the oxidation degree of oil, in particular to a method and a test box for rapidly detecting 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 test...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 潘咏梅蔡萌萌蒙雪艳裴双秀胡文静
Owner BEIJING SUNPU BIOCHEM TECH