Intelligent label for indicating freshness of aquatic products and preparation method of intelligent label

A smart label and freshness technology, which is applied in the direction of material analysis, measuring devices, instruments, etc. by observing the impact on chemical indicators, can solve the problem of low sensitivity, achieve good intuitiveness, realize fine management, and high sensitivity Effect

Pending Publication Date: 2017-10-24
GUANGDONG OCEAN UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These sensors have the advantages of not damaging the sample and

Method used

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  • Intelligent label for indicating freshness of aquatic products and preparation method of intelligent label
  • Intelligent label for indicating freshness of aquatic products and preparation method of intelligent label
  • Intelligent label for indicating freshness of aquatic products and preparation method of intelligent label

Examples

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Example Embodiment

[0038] In the preparation method of the smart label of the present invention, the pretreatment step includes 3 PO 4 :H 2 SO 4 :HNO 3 The volume ratio of 7:2:1, the chemical polishing step at 95~110℃ for 1~2min.

[0039] In the preparation method of the smart label of the present invention, in the primary anodizing step, the electrolyte uses a 0.4mol / L phosphoric acid solution, the oxidation voltage is 100V, the oxidation time is 120min, and the oxidation temperature is 0-4°C.

[0040] The method for preparing the smart label of the present invention is characterized in that the chemical etching step is etching in a mixed acid solution of 6% phosphoric acid and 1.8% chromic acid for 6-10 hours, and the temperature is controlled at 50-60°C.

[0041] In the preparation method of the smart label of the present invention, in the aluminum removal step, a mixed solution of saturated copper sulfate aqueous solution and hydrochloric acid with a volume ratio of 3:1 is used.

[0042] The smart la...

Example Embodiment

[0049] Example 1: Preparation of Anodic Aluminum Oxide Film (AAO)

[0050] (1) Sample pretreatment

[0051] Cut the aluminum sheet into small circles with a diameter of 25 mm, and soak them in acetone for 30 minutes to remove oil stains. At room temperature, soak in 0.1mol / L NaOH solution and ultrasonic for 5 minutes to remove the natural oxide film on the surface, and then clean it with deionized water. Finally in the mixed acid (H 3 PO 4 , H 2 SO 4 , HNO 3 , Volume ratio 7:2:1), chemical polishing at 95~110℃ for 1~2min.

[0052] (2) Primary anodic oxidation

[0053] The pretreated aluminum sheet is sandwiched between two thin plates, and placed in an oxidation tank for aluminum anodization. The electrolyte uses 0.4mol / L phosphoric acid solution, the oxidation voltage is 100V, the oxidation time is 120min, and the oxidation temperature is 0. ~4℃. The platinum sheet is used as the cathode, and the aluminum sheet is used as the anode. The sample adopts CP8-600V arc oxidation power s...

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Abstract

The invention relates to an intelligent freshness label. The intelligent freshness label is characterized in that a bromocresol green pH (Potential of Hydrogen) sensitive dyestuff is utilized and an anodic aluminum oxide film is used as an adsorption carrier of the dyestuff. The anodic aluminum oxide film has a pore diameter less than 200nm, is vertical to the surface and has the pore density of 10<9> pores/cm<2> to 10<10> pores/cm<2>. The intelligent label provided by the invention is a visualized label which can be used for accurately characterizing the freshness of foods and directly feeding food freshness information back to consumers. According to the intelligent freshness label provided by the invention, the quality change of foods in packages can be directly characterized according to changes of environment parameters including temperature, time and the like of the foods.

Description

technical field [0001] The invention relates to an intelligent label indicating the freshness of aquatic products and a preparation method thereof, in particular to an intelligent label indicating the freshness of fish or shrimp, which is an application of a new material and its application in the field of food safety Applications. Background technique [0002] With the improvement of living standards, people's demand for high-protein foods is increasing, and aquatic products are a good source of protein. Among them, the meat of tilapia is delicious, tender, contains a variety of unsaturated fatty acids and rich in protein. In Japan, this fish is called "a protein source that does not require protein". However, because it is rich in nutrients and water, the connective tissue in the muscle tissue is less, the endogenous protease is active, the autolysis speed is fast, and it is easy to change in physical, chemical, microbial and other aspects, making its freshness change. T...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/35
CPCG01N21/35G01N21/78G01N21/783
Inventor 李承勇莫日坚周春霞洪鹏志千忠吉
Owner GUANGDONG OCEAN UNIVERSITY
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