Quick-response oxygen indicator and preparation method thereof

A fast-response, indicator technology, applied in the direction of material analysis by observing the influence of chemical indicators, analysis by making materials undergo chemical reactions, and measuring devices, etc., can solve the problems of inconspicuous color changes, long response time, repetitive Less times and other problems, to achieve the effect of shortening the discoloration time, increasing stability and improving sensitivity

Active Publication Date: 2019-12-03
BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxygen indicators currently on the market are mainly prepared based on the principle of reversible redox between methylene blue and oxygen. Its main application form is tablet compression, which has the disadvantages of long response time, few repetitions and inconspicuous color changes.

Method used

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  • Quick-response oxygen indicator and preparation method thereof
  • Quick-response oxygen indicator and preparation method thereof
  • Quick-response oxygen indicator and preparation method thereof

Examples

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preparation example Construction

[0027] The invention provides a preparation method of a fast-response oxygen indicator, comprising the following steps:

[0028] (1) preparing a buffer solution with a pH value of 11 to 12;

[0029] Prepare an aqueous sodium isoVC solution with a pH value of 11-12;

[0030] (2) Mix the buffer solution, iso-VC sodium aqueous solution, rhodamine alkaline and methylene blue to obtain methylene blue-iso-VC sodium solution; the pH value of the methylene blue-iso-VC sodium solution is 11~12;

[0031] (3) After the carrier is impregnated in the methylene blue-sodium isoVC solution, it is dried to obtain a quick-response oxygen indicator;

[0032] Or after mixing the hydrophilic fumed silica powder with the methylene blue-sodium isoVC solution, dry to obtain a quick-response oxygen indicator;

[0033] Or mix the hydrophilic fumed silicon dioxide powder with the methylene blue-sodium isoVC solution, dry to obtain a powder, and then press the powder into tablets to obtain a quick-resp...

Embodiment 1

[0060] (1) Glycine and sodium chloride concentration are 0.1mol / L glycine-sodium chloride aqueous solution and concentration are 0.1mol / L sodium hydroxide aqueous solution are mixed according to the ratio of volume ratio 49:51, obtain pH value 11.6 buffer solution;

[0061] (2) adding solid sodium hydroxide to the iso-VC sodium aqueous solution with a mass concentration of 8%, adjusting the pH value to 11.5 to obtain an alkaline iso-VC sodium aqueous solution;

[0062] (3) Mix 10mL buffer solution, 25mL alkaline iso-VC sodium aqueous solution, 3mg basic rhodamine and 8mL mass concentration of 0.2% methylene blue aqueous solution to obtain a methylene blue-isoVC sodium solution with a pH value of 11.6;

[0063] (4) Soak the white filter paper in the methylene blue-sodium isoVC solution for 1 min, take it out, and dry it naturally in a nitrogen atmosphere to obtain an oxygen indicator paper.

Embodiment 2

[0065] Prepare methylene blue-sodium VC solution according to steps (1)~(3) in Example 1;

[0066] Soak the cotton thread in the methylene blue-sodium isoVC solution for 1 min, take it out, and dry it naturally in a nitrogen atmosphere to obtain an oxygen indicator line.

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Abstract

The invention provides a quick-response oxygen indicator and a preparation method thereof and belongs to the technical field of oxygen measurement. The preparation method comprises the following steps: preparing a buffer solution with a pH value of 11-12; preparing a sodium erythorbate aqueous solution with a pH value of 11-12; mixing the buffer solution, a sodium erythorbate aqueous solution, basic rhodamine and methylene blue to obtain a methylene blue-sodium erythorbate solution, wherein the pH value of the methylene blue-sodium erythorbate solution is 11-12; and then, carrying out different treatment on the methylene blue-sodium erythorbate solution to obtain oxygen indicators in different forms so as to adapt to different purposes. The oxygen indicators prepared by the preparation method are short in response time, high in repeatable frequency and obvious in color change.

Description

technical field [0001] The invention relates to the technical field of oxygen measurement, in particular to a quick-response oxygen indicator and a preparation method thereof. Background technique [0002] Compared with the complex oxygen meter detection method, the oxygen indicator is easy to use and reliable in performance. Oxygen indicator is used to intuitively judge the presence or absence of oxygen in airtight packaging, containers or anaerobic bacteria cultivation process by color change. When the volume percentage of oxygen in the contacted gas is greater than 0.5%, the oxygen indicator is displayed in blue, less than 0.5%. It turns red and is widely used in food packaging, mechanical packaging, and various chemical industrial processes. Oxygen indicators currently on the market are mainly prepared based on the reversible redox principle of methylene blue and oxygen, and its main application form is tablet compression, which has the disadvantages of long response ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
CPCG01N21/783
Inventor 罗世永胡运昊
Owner BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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