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Method for improvingthermal stability of test strips for detecting peroxide value of cooking oil

A technology of oil peroxide value and thermal stability, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions. It can solve the problems of easy failure, inaccurate results, and long reaction time. And other issues

Inactive Publication Date: 2015-04-01
GUILIN ZHONGHUI TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Published the invention document patent of detection peroxide value successively both at home and abroad, as Chinese patent (CN87106131.7) " peracetic acid measuring test paper and preparation method thereof " relate to the content of the peracetic acid in the water-soluble disinfectant of measuring with test paper; Japan The patent (53-30383) "Preparation method of test paper for the determination of peroxide in oil" uses soluble starch and potassium iodide as the main components, and both have the following defects: sensitive to light and oxygen, easy to fail; long reaction time, more than 5 minutes; Can only measure qualitatively and semi-quantitatively, cannot measure accurate values, etc.
During storage, some reducing agents are deactivated, so when the strip is finally used, inaccurate results may be obtained

Method used

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  • Method for improvingthermal stability of test strips for detecting peroxide value of cooking oil
  • Method for improvingthermal stability of test strips for detecting peroxide value of cooking oil
  • Method for improvingthermal stability of test strips for detecting peroxide value of cooking oil

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The stabilizer of embodiment 1 reagent composition only has the preparation of the test paper block of trehalose

[0019] 1. Dissolve 100g of citric acid buffer reagent, 1.6g of horseradish peroxidase, 2.8g of surfactant, 12g of background material and 100g of trehalose in 1000mL of deionized water in sequence. Immerse the filter paper in the solution, take it out after 1 minute, and dry it at 60°C; then dissolve 15g of the color developer and 10g of the reaction accelerator in 1000mL of absolute ethanol, soak the filter paper in the solution for 1 minute, take it out and dry it at 60°C Dry at ℃, cut into 5×5mm square test paper pieces and pack them in airtight vacuum-packed aluminum foil bags for later use. At the same time, a small amount of test paper pieces were sealed and placed in an oven at 60°C for continuous baking for 1 day, 2 days, and 7 days respectively.

[0020] 2. Use a straw to drop a drop of the oil sample to be tested on the test paper block. After 12...

Embodiment 2

[0023] The stabilizer of embodiment 2 reagent composition has only the preparation of the test paper block of mannitol

[0024] 1. Dissolve 100g of citric acid buffer reagent, 1.6g of horseradish peroxidase, 2.8g of surfactant, 12g of background material and 100g of mannitol in 1000mL of deionized water in sequence. Immerse the filter paper in the solution, take it out after 1 minute, and dry it at 60°C; then dissolve 15g of the color developer and 10g of the reaction accelerator in 1000mL of absolute ethanol, soak the filter paper in the solution for 1 minute, take it out and dry it at 60°C Dry at ℃, cut into 5×5mm square test paper pieces and pack them in airtight vacuum-packed aluminum foil bags for later use. At the same time, a small amount of test paper pieces were sealed and placed in an oven at 60°C for continuous baking for 1 day, 2 days, and 7 days respectively.

[0025] 2. Use a straw to drop a drop of the oil sample to be tested on the test paper block. After 120 ...

Embodiment 3

[0028] The stabilizer of embodiment 3 reagent composition is the preparation of the mixture test paper block of mannitol and trehalose

[0029] 1. Dissolve 100g of citric acid buffer reagent, 1.6g of horseradish peroxidase, 2.8g of surfactant, 12g of base color material and 100g of a mixture of mannitol and trehalose in 1000mL of deionized water in sequence. Immerse the filter paper in the solution, take it out after 1 minute, and dry it at 60°C; then dissolve 15g of the color developer and 10g of the reaction accelerator in 1000mL of absolute ethanol, soak the filter paper in the solution for 1 minute, take it out and dry it at 60°C Dry at ℃, cut into 5×5mm square test paper pieces and pack them in airtight vacuum-packed aluminum foil bags for later use. At the same time, a small amount of test paper pieces were sealed and placed in an oven at 60°C for continuous baking for 1 day, 2 days, and 7 days respectively.

[0030] 2. Use a straw to drop a drop of the oil sample to be...

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Abstract

The invention aims to provide a method for improving the thermal stability oftest strips for detecting a peroxide value of cooking oil. By means of the method, the sample processing and detection time is shortened greatly, and the accuracy of the test strips is improved, so that fast field detection of samples is realized. The method for improving the thermal stability of the test strips for detecting the peroxide value of cooking oil comprises the steps as follows: (1), a citric acid buffering agent, a reducing agent, a surfactant, a ground color raw material and a stabilizer are dissolved in deionized water to obtain a solution A; (2), a developer and a reactionpromoter are dissolved in absolute ethyl alcohol to obtain a solution B; (3), filter paper is soaked in the solution A and the solution B sequentially, and then subjected to air blast drying; (4), the dried filter paper is slit into test strip blocks and packaged; (5), the reflectivity is detected in the wavelength range of 600-650 nm; and (6), various levels of peroxide value standard solutions (0-12 meq / kg) are prepared, the true value is calibrated with a chemical titration method, the standard solutions are added dropwise to the test strip blocks quantitatively, the wavelength is selectedfor detection of the reflectivity of each test strip blocks, and a reflectivity-peroxide value relation curve and a standardequation are worked out.

Description

technical field [0001] The invention relates to the field of edible oil safety detection, in particular to a method for improving the thermal stability of a test paper for detecting the peroxide value of edible oil. Background technique [0002] The detection of peroxide value of edible oil is a key means to ensure the quality of oil products. The widely used determination methods at home and abroad mainly include high performance liquid chromatography and chemical titration. High-performance liquid chromatography requires the use of large-scale equipment, which is expensive and difficult to use as a general survey; while chemical titration has a long reaction time and cumbersome steps, reagents need to be prepared more than a week in advance, and all manual operations are prone to human factors of operators interference. At present, each epidemic prevention department in my country detects the peroxide value of edible oil in accordance with the analysis method (chemical ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 廖姗李中梁明龙伍寿胜
Owner GUILIN ZHONGHUI TECH DEV
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