Method for detecting peroxide value of euphausia superba oil

An Antarctic krill oil and peroxide value technology, which is applied in chemical analysis by titration method, can solve the problems of low detection accuracy of iodometric method and many interference factors, and achieves a wide range of use, less interference factors, and measurement Accurate effect

Active Publication Date: 2017-05-03
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for detecting the peroxide value of Antarctic krill oil, whi...

Method used

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  • Method for detecting peroxide value of euphausia superba oil
  • Method for detecting peroxide value of euphausia superba oil
  • Method for detecting peroxide value of euphausia superba oil

Examples

Experimental program
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Embodiment 1

[0054] Detection of peroxide value of Antarctic krill oil

[0055] Take 2g of Antarctic krill oil sample, dissolve it completely with 50mL of glacial acetic acid-isooctane (3:2, v / v) mixed solvent, add 0.5mL of saturated potassium iodide solution, cover it and let it react for 1min±1s, immediately Add 30 mL of distilled water. Then titrate with sodium thiosulfate solution at a certain speed while stirring, and record the redox potential value of the reaction solution and the corresponding titration volume. Specific steps are as follows:

[0056] (1) Fix the burette 2 and the pen-type ORP meter 1 on the magnetic stirrer, and set up as figure 1 device shown.

[0057] (2) Pipette 2g of Antarctic krill oil sample into a 150mL beaker.

[0058] (3) Add 50 mL of mixed solvent of glacial acetic acid-isooctane (volume ratio 3:2), seal with tinfoil paper and stir rapidly on magnetic stirrer 3 until the sample is dissolved;

[0059] (4) Add 0.5mL of saturated potassium iodide soluti...

Embodiment 2

[0081] Accuracy detection of peroxide value of light-colored fish oil

[0082] In order to verify the accuracy of the ORP meter in determining the peroxide value of oil, taking fish oil as an example, the above method and the national standard iodometric method were used to measure the peroxide value of fish oil respectively, and a comparison was made. Specific experiments include:

[0083] Take a 2g fish oil sample, and use a pen-type ORP meter as a detection tool to measure the peroxide value of fish oil. The specific steps are as follows:

[0084] (1) Fix the burette and pen-type ORP meter on the magnetic stirrer, set up as figure 1 device shown.

[0085] (2) Pipette 2-5 g of fish oil samples into a 150 mL beaker.

[0086] (3) Add 50 mL of mixed solvent of glacial acetic acid-isooctane (volume ratio 3:2), seal with tinfoil paper and stir rapidly on a magnetic stirrer until the sample is dissolved;

[0087] (4) Add 0.5mL of saturated potassium iodide solution to the mixe...

Embodiment 3

[0124] The difference from Example 1 is that the sampling amount is different, and the shrimp oil sampling is 5g, and the others are the same.

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Abstract

The invention provides a method for detecting the peroxide value of euphausia superba oil. The method comprises the following steps: taking a certain amount of euphausia superba oil m, dissolving the euphausia superba oil in an organic solvent, adding an excessive potassium iodide solution for a reaction, then continuously dropwise adding a sodium hyposulfite solution with the concentration being C to the obtained product and detecting the potential value of the solution till the potential value is stable, during the titration process, discretely recording the titration volume V and the potential value E of the solution, plotting a relation curve of the titration volume V and the potential value E through a second-order derivative method, searching the titration volume Vx of a potential jump point, and calculating the peroxide value of a to-be-detected sample according to the following formula: P'=(Vx-V0)*C/2m, wherein V0 is the titration volume of a potential jump point detected in a blank sample according to the method above. According to the method, problems that the detection accuracy of an iodometric method is low, and many interference factors result from a solvent, the temperature, and a pH value are solved.

Description

technical field [0001] The invention relates to the field of food detection, in particular to a method for detecting the peroxide value of Antarctic krill oil. Background technique [0002] The peroxide value of edible oil is one of the important indicators to test the freshness and quality grade of oil. It is expressed in millimoles (or milligram equivalents) of active oxygen per kilogram, which can reflect the rancidity of oil. The determination methods of peroxide value mainly include iodometric method, spectroscopic method and chromatographic method. [0003] Among them, the iodometric method is an international general method and is widely used by laboratories at home and abroad. The current national standards "GB / T5538-2005 Determination of Peroxide Value of Animal and Vegetable Oils" and "GB / T 5009.37-2003 Analytical Methods for Hygienic Standards of Edible Vegetable Oils" both use the iodometric method. The traditional iodometric method is based on the color reacti...

Claims

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Application Information

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IPC IPC(8): G01N31/16
Inventor 张晓慧尹佳周新王践云窦庶华李文强
Owner SHENZHEN INST OF ADVANCED TECH
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