Test paper for rapid detection of nitrite in food and preparation method thereof

A technology of nitrite and food, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, which can solve the problems of expensive instruments, wide detection range, and limited sensitivity, and achieve The effect of simple operation and low cost

Inactive Publication Date: 2012-11-21
王靖
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the expensive instruments used in the above method and the complicated operation methods, it is difficult to apply it to the field detection of nitrous acid
Patent 03130015.4, patent 03116663_6 and 200510048918.4 announced the method of using sulfonamide, dihydrochloride-1-ethylenediamine dihydrochloride and tartaric acid to detect nitrite content in food, but its detection range is too wide and the sensitivity is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First, immerse the filter paper in 0.5-1% sodium chloride solution, dry it at 100°C, then weigh 1-naphthaleneethylenediamine dihydrochloride, 5-sulfosalicylic acid, etc. according to the regulations and weight, dissolve In ethanol, slowly add the dispersant until completely dissolved, and make the volume to 100mL. Dip the dried filter paper into the dissolved solution, put it out, and dry it in an oven at 600C. Paste the processed filter paper on the substrate, and cut it into strips with a length of 8 cm and a width of 1 cm. Sealed and stored in a dry environment at 2-30°C, not in the refrigerator, and not exposed to direct sunlight.

Embodiment 2

[0022] First, soak the filter paper in 0.5-1% sodium chloride solution, dry it at 80°C, then weigh the dihydrochloride-1-naphthaleneethylenediamine, p-toluenesulfonic acid, etc. according to the regulations and weight, and dissolve them in ethanol , slowly add TWEEI80 until completely dissolved, and dilute to 100mL. Dip the dried filter paper into the dissolved solution, take it out, and dry it in an oven at 80°C. Paste the treated filter paper on the substrate, and cut it into strips with a length of 8 cm and a width of 1 cm. Sealed and stored in a dry environment at 2-30°C, not in the refrigerator, and not exposed to direct sunlight.

Embodiment 3

[0024] First soak the filter paper in 0.5-1% sodium chloride solution, dry it at 110°C, then weigh dihydrochloride-1-naphthaleneethylenediamine, sulfamic acid, etc. according to regulations and weight, and dissolve them in ethanol , slowly add Triton100 until it is completely dissolved, and dilute to 100mL. Dip the dried filter paper into the dissolved solution, take it out, and dry it in an oven at 80°C. Paste the treated filter paper on the substrate, and cut it into strips with a length of 8 cm and a width of 1 cm. Sealed and stored in a dry environment at 2-30°C, not in the refrigerator, and not exposed to direct sunlight.

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PUM

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Abstract

The invention relates to test paper for rapid detection of nitrites in food and a preparation method thereof, and belongs to the food safety detection field. The test paper comprises a detection substrate and detection test paper. The detection principle is that under an acidic condition, diazotization of nitrites in food is performed with sulfonic acid diazotization reagents, and a coupling reaction is performed with n-(1-naphthyl)-ethylenediamine dihydrochloride to generate a purplish red compound. The test paper is used for rapid detection of nitrite content in food; the method has the advantages of rapidness, sensitivity, simple operation, and low cost, requires no professional personnel to operate, is convenient for self application by common people at home, and is also applicable to rapid detection requirements in business, food safety, and markets.

Description

technical field [0001] The invention relates to a fast, sensitive and convenient test paper for detecting nitrite in food and a preparation method thereof, belonging to the field of food safety detection. Background technique [0002] With the improvement of living standards, people's demand for food no longer only focuses on the quantity of consumption, but pays more attention to the quality. Among the current various foods, vegetables are a kind of crops that are easy to accumulate nitrate. Most of the nitrate ingested by the human body (accounting for 70-80%) comes from vegetables, and it is widely used in meat products such as pickled sausages, sausages and ham. Nitrite is used as a hair coloring agent, and canned food, bamboo shoot products, fresh fish, meat, eggs, and milk powder products all contain different concentrations of nitrite. [0003] Nitrite can form strong carcinogens-nitrosamines with amines under appropriate conditions, so it is often regarded as a pote...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 王靖
Owner 王靖
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