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RGB quantitative quick detecting test paper for formaldehyde residue in food

A technology for detecting test paper and formaldehyde, which is applied in the direction of analysis by chemical reaction of materials, and material analysis by observing the impact on chemical indicators. , complex operation and other problems, to achieve the effect of simple structure and operation, low production cost and good repeatability

Inactive Publication Date: 2014-10-01
FUDEAN OF BEIJING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the patent 201210394786.0 has announced the test paper for rapid detection of formaldehyde residues developed with phosphotungstic acid or silicotungstic acid, but the test paper can only detect liquid systems, and it needs to be irradiated with ultraviolet light to observe the color change of the test paper. The reaction results are qualitative or semi-quantitative, and cannot Make accurate quantitative judgments
There is also a patent 201220005382.3 which discloses a utility model of rapid detection test paper for formaldehyde residues. It is necessary to puncture the plastic bottle with a sharp object, and drop the reaction liquid in it onto the test paper. The operation is more complicated, and the existence of liquid components is not conducive to the test paper as a commodity. circulation and application

Method used

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  • RGB quantitative quick detecting test paper for formaldehyde residue in food
  • RGB quantitative quick detecting test paper for formaldehyde residue in food
  • RGB quantitative quick detecting test paper for formaldehyde residue in food

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] First prepare a mixed solution of 5% disodium edetate and 2.5% citric acid, and set the volume to 100mL; add Schiff reagent, and mix according to the volume ratio of the mixed solution:Schiff reagent is 2:1 to obtain a reaction solution. Soak 3mm chromatographic filter paper in the reaction solution for 10s, and dry for 30min at a temperature of 50°C and a vacuum of 100-110Pa. Adhere the treated filter paper on the substrate and cut it into 0.55cm×7cm test strips. Sealed and stored in a dry environment at 4°C, and should not be exposed to direct sunlight.

Embodiment 2

[0032] First prepare a mixed solution of 7% disodium edetate and 4% citric acid, and set the volume to 100mL; add Schiff reagent, and mix according to the volume ratio of the mixed solution:Schiff reagent is 2:1 to obtain a reaction solution. Soak 3mm chromatographic filter paper in the reaction solution for 20s, and dry for 40min at a temperature of 60°C and a vacuum of 100-110Pa. Adhere the treated filter paper on the substrate and cut it into 0.55cm×7cm test strips. Sealed and stored in a dry environment at 4°C, and should not be exposed to direct sunlight.

[0033] Detection example

Embodiment 3

[0035]6 samples of frozen seafood purchased from supermarkets, including eel segments, scallops, scallops, shrimp, squid flowers and squid rings. Take the edible parts and grind them respectively and mix them with distilled water of the same quality. After soaking for 5 minutes, stir evenly. Take the area of ​​the chromogenic sheet immersed in the test paper as the standard. Take it out immediately after immersion, and place the chromogenic sheet facing upwards horizontally. Perform semi-quantitative readings and RGB quantitative judgments. When performing semi-quantitative judgment, compare the color of the test paper with the standard color comparison card. The value corresponding to the color scale that is the same as the color of the color comparison card is the detection value of the sample. If the color of the test paper is between the two color scales, it is Take the middle value of the two. When performing quantitative determination, use the color reading software to ...

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Abstract

The invention relates to an RGB quantitative quick detecting test paper for formaldehyde residue in food, and belongs to the field of food security detection. The RGB quantitative quick detecting test paper just comprises two parts of a paper base and a developing paper scrap; structure and operation are simple; 3 mm chromatography filter paper is adopted as a carrier; the test paper can conduct quick semiquantitative and RGB quantitative detection on formaldehyde residue in 8-10 min; accurate quantitative detection conclusion can be acquired by observing by eyesight or reading RGB of the test paper color; a precious instrument is not needed to display; a user can grasp the test paper without special training; meanwhile, the test paper is cheap in price and low in manufacturing cost, is disposable without inspection, repair and maintenance, and is relatively high in degree of accuracy, good in repeatability, and very suitable for on-site real-time quick detection and monitor.

Description

technical field [0001] The invention relates to a fast, sensitive and convenient test paper for quantitatively detecting formaldehyde residues in food, belonging to the field of food safety detection. Background technique [0002] Formaldehyde (HCHO), also known as formic aldehyde, is the simplest aldehyde, usually a flammable, colorless and irritating gas, easily soluble in water, alcohol and ether, 35-40% formaldehyde aqueous solution is called fu Marlin. Formaldehyde is a highly toxic substance, ranking second on my country's priority list of toxic chemicals, and has been identified as a carcinogenic and teratogenic substance by the World Health Organization (WHO). mutant. Originally in the "GB2760-2007 Hygienic Standards for the Use of Food Additives", formaldehyde can be used as a processing aid in the food industry. For example, formaldehyde can be used as a beer colloidal stabilizer to reduce the content of protein and polyphenols in beer and slow down the formation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 许文涛程楠黄昆仑罗云波董凯翟百强
Owner FUDEAN OF BEIJING TECH
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