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Test paper for rapidly testing nitrite in food and preparation method thereof

A technology for nitrite and food, applied in the field of chemical detection, can solve the problems of expensive instruments, wide detection range, and limited sensitivity, and achieve the effect of low cost and easy operation

Inactive Publication Date: 2009-12-30
BEIJING ZHIYUNDA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore nitrite is all an important detection indicator in hygiene inspection and environmental protection etc., has established spectrophotometry, ion chromatography and electrochemical method to measure nitrite at present, but because the instrument used in above-mentioned method is expensive , and the operation method is relatively complicated, it is difficult to apply it to the field detection of nitrite
Patent 03130015.4, patent 03116663.6 and 200510048918.4 disclose methods for detecting nitrite content in food using sulfonamide, 1-naphthaleneethylenediamine dihydrochloride and tartaric acid, but the detection range is too wide and the sensitivity is limited

Method used

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  • Test paper for rapidly testing nitrite in food and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 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 PVP 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 60°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 2

[0025] 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 TWEEN80 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

[0027] First, immerse 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 the regulations and weight, and dissolve them in ethanol. Slowly add Triton100 until it is completely dissolved, and set the volume 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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Abstract

The invention relates to test paper for rapidly testing the nitrite content in food and a preparation method thereof, which belongs to the field of chemical testing. The test paper for rapidly testing the nitrite content in food comprises a test base plate and a test paper. The testing principle is as follows: after the nitrite in food and sulfonic acid diazotizing reagent are diazotized under acidic conditions, then the nitrite is coupled with hydrochloric acid naphthyl ethylenediamine, and then mauve compound is generated. The test paper is used for the rapid testing for the nitrite content in food, the method has the advantages of fleetness, sensitiveness, simple operation and low cost, the operation by professional is not required, the test paper is convenient for the user to be used at home without any help, and can also be applied to rapid testing demand of the industry and commerce, food safety and market.

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 chemical 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 potenti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 刘亚韩丹丹李峰
Owner BEIJING ZHIYUNDA TECH CO LTD
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