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Strip for quickly determining nitrous radical content in vegetable, preparation and determination method thereof

A technology for rapid determination of nitrite, applied in the measurement of color/spectral characteristics, material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, which can solve errors and cannot be measured in time, etc. problem, to achieve the effect of high precision, sensitive response and low price

Inactive Publication Date: 2006-05-10
SHANGHAI NORMAL UNIVERSITY
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AI Technical Summary

Problems solved by technology

Samples containing nitrite should be measured quickly after sampling, otherwise the bacteria in the sample can change the concentration of nitrite. The previous method was to send the sample to the laboratory. Some samples were collected far away from the laboratory. Unable to measure in time resulting in error

Method used

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  • Strip for quickly determining nitrous radical content in vegetable, preparation and determination method thereof

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Embodiment Construction

[0039] specific implementation plan

[0040] The present invention will be further described below in conjunction with embodiment:

[0041] 1. Production of speed test strips

[0042] A nitrite rapid test strip, comprising a white substrate 1 with a thickness of 0.7mm and a hard plastic material, and a color-developing filter paper 2, which is an ordinary qualitative filter paper with a sulfonamide concentration of 0.1-3.5%, The concentration of citric acid is 5-30%, and the aqueous solution of sodium citrate is 0.3-1.0%. After fully soaking, dry it in a drying oven at 28-72°C, and then immerse it in a concentration of 0.8-3.0% naphthaleneethylenediamine ethanol solution, and then dried again in a 28-72° C. drying oven, and finally cut the color-developing paper sheet 2 into 0.6×0.6 cm, and glued it on the substrate 1 .

[0043] 2. Determination method:

[0044] (1) Pre-treatment: Cut 1.0g of vegetables into pieces, grind them finely into a 25ml conical flask, add 10ml of w...

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Abstract

The invention relates to a measuring bar for rapidly measuring content of nitrite in vegetables and method for making the same. To be exact, the invention relates to employing color changes of rapid measuring bar to indicate effect nitrite content for chemical indicator. The measuring bar comprises base plate and color test paper, wherein the color test paper is made by immersing filter paper into 0.1-3.5% sulfa agent, taking water and alcohol as solvent, taking citric acid and sodium citrate as assistant; drying in 28-72 degree, dipping in 0.8-3.0úÑ naph ethylenediamine alcohol and drying in 28-72 degree. The inventive test paper has the advantages of being high sensitivity and high testing accuracy.

Description

technical field [0001] The invention relates to a preparation method and a detection method of a quick test strip for nitrite content, which is mainly used for the detection of nitrite content in vegetables. More precisely: It involves a method of using a rapid test strip to produce a color change to observe the effect of the nitrite content on the chemical indicator. Background technique [0002] Food safety is a major issue that people generally pay attention to, and people pay more and more attention to the rapid monitoring methods of food safety. Since most of the food safety testing is on-site sampling and indoor testing and analysis, it is highly professional, complicated procedures, and time-consuming and financially consuming. For most grassroots units and remote areas, the regular food safety monitoring is not financially sufficient. At present, the test paper method has been used to replace the chemical method in clinical testing, medicine, food testing and other ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/29
Inventor 何其庄任萃毅
Owner SHANGHAI NORMAL UNIVERSITY
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