Quick-speed nondestructive fish fresh degree detecting paper box and detecting method thereof

A technology for detecting test paper and test paper box, which is applied in the field of storage detection and aquatic product processing, can solve the problems of fish storage temperature limit, poor measurement safety, fish sample damage, etc. Effects in simple steps

Inactive Publication Date: 2008-03-05
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is also possible to judge the freshness of the fish body by the stiffness index of the fish body. Although it does not cause damage to the fish body and does not require equipment, it has no corresponding relationship with the indicators of GB2733-2005 and is limited by the storage temperature of the fish body.
[0005] The disadvantages of the above methods are that they are subjective, or take a long time to inspect, or require expensive instruments, or have poor measurement safety, or cause damage to fish samples, or require inspectors to have high professional knowledge Other shortcomings and deficiencies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 takes crucian carp as an example

[0027] (1) Soak 1×4cm Xinhua filter paper in 0.01g / ml phenolphthalein solution, and dry at 40°C to a moisture content of 5%. It is the prepared test strip.

[0028] (2) Paste the test strip on the surface of crucian carp to be detected for 20 minutes;

[0029] (3) Take off the test strip and put it into the test tube, and add 2ml of 36% formaldehyde solution;

[0030] (4) Add solution NaOH (concentration is 0.06mol / L) dropwise with a graduated test tube until the color of the solution is pink and does not fade for 30 seconds;

[0031] (5) Record the volume of the consumed solution NaOH, the volume is 5.10ml;

[0032] (6) Look up the attached table in the test strip box, if it is larger than the corresponding 4.75ml of freshwater fish, it indicates that the freshness of the crucian carp body does not meet the requirements of GB2733-2005, and it is a substandard product.

Embodiment 2

[0033] Embodiment 2 takes large yellow croaker as an example

[0034] (1) Soak 2×2 cm absorbent paper in 0.005 g / ml phenol blue solution, and dry at 50° C. to a water content of 8%. It is the prepared test strip.

[0035] (2) Paste the test strip on the surface of the large yellow croaker to be detected for 15 minutes;

[0036] (3) Take off the test paper strip and put it into the test tube, and add a concentration of 30% formaldehyde solution, and soak the test paper completely;

[0037] (4) Add the solution KOH (concentration is 0.5mol / L) dropwise with a graduated test tube until the color of the solution is blue-purple and does not fade for 30 seconds;

[0038] (5) record the volume of the consumed solution KOH, the volume is 0.32ml;

[0039] (6) Look up the attached table in the test strip box, if it is less than 0.86ml corresponding to seawater fish, it shows that the freshness of the large yellow croaker still meets the requirements of GB2733-2005, and it is a qualifi...

Embodiment 3

[0040] Embodiment 3 takes carp as an example

[0041] (1) Adsorb and soak 1×4 cm absorbent paper in 0.025 g / ml thymol blue solution, and dry at 50° C. to a water content of 9%. It is the prepared test strip.

[0042] (2) Paste the test strip on the carp body surface to be tested for 20 minutes;

[0043] (3) Take off the test paper strip and put it into the test tube, and add a concentration of 35% formaldehyde solution, and soak the test paper completely;

[0044] (4) Add the solution KOH (concentration is 0.3mol / L) dropwise with a graduated test tube until the color of the solution is blue-purple and does not fade for 30 seconds;

[0045] (5) Record the volume of the consumed solution KOH, the volume is 0.76ml;

[0046](6) Look up the attached table in the test strip box, if it is less than 0.95ml corresponding to freshwater fish, it shows that the freshness of the carp body still meets the requirements of GB2733-2005, and it is a qualified product.

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PUM

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Abstract

The test paper box thereof comprises: test paper tape, formalin, sodium hydroxide or potash solution, dropper with scale, test tube and attached list. The test paper is attached to the fish body; then taking off the test paper, and putting the test paper into the formalin solution; using the dropper with scale to suck the sodium hydroxide solution; adding the sodium hydroxide solution into the test tube until it shows pink or royal purple color; based on the volume of dropped sodium hydroxide, confirming the fresh level of the fish body.

Description

technical field [0001] The invention belongs to the technical field of aquatic product processing and storage detection, and specifically relates to the rapid and non-destructive detection and determination of the freshness of non-frozen and non-slaughtered complete fish bodies in the process of fish production, processing, storage and sales. Background technique [0002] Due to the characteristics of fish rich in nutrients and tissue components, the fish body tissue is easily invaded by microorganisms, and its own enzymes are active. After fishing, the fish body is easily decomposed by microorganisms and enzymes at room temperature and deteriorates. Oxidation, rancidity and discoloration of the fat in food will also occur, which will affect the appearance of color and luster. Therefore, after the fish body is caught, its freshness is gradually declining. Various rancid products such as amines, hydrogen sulfide, and lower fatty acids are produced during the spoilage process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79G01N33/12
Inventor 熊晓辉陆利霞李霞田灏
Owner NANJING UNIV OF TECH
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