Edible oil peroxide value measurement combined reagent and detection method

A technology of peroxide value and edible oil, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc. The effect of interference and easy assembly and carrying

Inactive Publication Date: 2013-08-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] To sum up, there are big differences in the sensitivity, accuracy, detection simplicity and cost of various detection methods, so it is easy to establish a new detection method with high sensitivity, good accuracy, mild detection conditions and low cost. , the green detection method with less time consumption is still an urgent requirement of the society and an important research goal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: the combination reagent of this embodiment is polar organic solvent, reducing agent, color developing reagent, color developing stabilizer; Described polar organic solvent is recorded by volume percentage, comprises 70% ethanol; Described reducing agent is by volume percentage Weight percent record, the mass concentration that comprises ferrous sulfate is 3.6g / L; Described chromogenic reagent is sulfosalicylic acid solution, and mass concentration is 528 g / L; Described chromogenic stabilizer is pyridoxamine hydrochloride solution , with a mass concentration of 225 g / L.

[0032] First, it is necessary to make a standard curve of iron ions. The making of described iron ion standard curve diagram comprises the following steps:

[0033] (a) Add the reduced iron powder to hydrochloric acid and hydrogen peroxide to dissolve, heat to remove the hydrogen peroxide, dilute and mix with water after cooling, and prepare a 10 mg / mL iron standard stock solution;

[00...

Embodiment 2

[0046] Embodiment 2: In the present embodiment, the polar organic solvent is recorded by volume percentage, including 30% ethanol; the reducing agent is recorded by weight percentage, and the mass concentration comprising ferrous sulfate is 20g / L; The color reagent is a sulfosalicylic acid solution with a mass concentration of 528 g / L; the color stabilizer is a pyridoxamine hydrochloride solution with a mass concentration of 225 g / L.

[0047]The sampling oil in this embodiment is corn oil, and 20 μL of corn oil is pipetted with a pipette gun, and other implementation methods are the same as in Example 1.

[0048] Finally, the POV value of the corn oil measured was 1.051mmol / Kg.

[0049] The oil sample was serially diluted with ethanol to obtain a sensitivity of 0.094 mmol / L for the method.

Embodiment 3

[0050] Embodiment 3: In the present embodiment, the polar organic solvent is recorded by volume percentage, including 90% ethanol; the reducing agent is recorded by weight percentage, and the mass concentration including ferrous sulfate is 1g / L; The color reagent is a sulfosalicylic acid solution with a mass concentration of 528g / L; the color stabilizer is a pyridoxamine hydrochloride solution with a mass concentration of 225g / L.

[0051] The sampling oil in this embodiment is rapeseed oil, and 20 μL of rapeseed oil is pipetted with a pipette gun, and other implementation methods are the same as in Example 1.

[0052] Finally, the POV value of rapeseed oil measured was 1.119mmol / Kg.

[0053] The oil sample was serially diluted with ethanol to obtain a sensitivity of 0.121 mmol / L for the method.

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Abstract

The invention relates to measurement of peroxide values, and in particular relates to an edible oil peroxide value measurement combined reagent and a detection method. The edible oil peroxide value measurement combined reagent comprises a polarity organic solvent, a reducing agent, a color development reagent and a color development stabilizing agent, wherein the polarity organic solvent comprises ethanol with the mass concentration of 237-710 g/L in percentage by mass; the reducing agent comprises ferrous sulfate with the mass concentration of 1-20 g/L in percentage by weight; the color development reagent is a sulfosalicylic acid solution with the mass concentration of 300-1,000 g/L; and the color development stabilizing agent is a pyridoxamine dihydrochloride solution with the mass concentration of 20-800 g/L. By a colorimetric analysis method, the operation is quick and simple, and interference caused by heating on a detection result is reduced; the types of the needed detection reagents is few, and the reagents are convenient to combine and carry; and the edible oil peroxide value measurement combined reagent can develop and detect a plurality of oil samples at the same time, is uniform in developing, is low in toxicity and even non-toxic, and is safe and environmentally-friendly.

Description

technical field [0001] The invention relates to the measurement of peroxide value, in particular to a combination reagent and detection method for the determination of peroxide value of edible oils and fats. Background technique [0002] As we all know, edible oily or oily food needs a certain period of time from production to consumption, and sometimes requires long-term storage. During storage or use, oily or oily food is easily affected by oxygen in the air, light, etc., and undergoes oxidation as the main body. The reaction will not only change the senses, such as deepening the color and producing unpleasant odors (mainly caused by the aldehydes formed by the easy partial decomposition of the generated peroxides), but also will cause nutritional deterioration, the degree of deterioration is serious or even Toxic substances will be produced, threatening the health of consumers. [0003] At present, the main methods for detecting oil oxidation products are as follows: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 章宇陈景楠蔡丹倩
Owner ZHEJIANG UNIV
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