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Color-sensitive indication label for detecting freshness of fishes and preparation method of color-sensitive indication label

A color-sensitive indicator and label technology, which is applied in the direction of material analysis by observing the influence of chemical indicators, single-component polyester rayon, fiber chemical characteristics, etc., can solve the problems of insignificant indication effect, easy decomposition, Eliminate problems such as shedding, achieve real-time detection of freshness, large specific surface area, and improve sensitivity

Pending Publication Date: 2020-12-22
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The use of color-sensitive materials as intelligent indicator labels for food freshness detection has been a research hotspot in recent years. Commonly used porphyrin-based color-sensitive materials contain metal particles and are easy to agglomerate. In addition, metal particles are not suitable for food detection
The unstable chemical properties of natural pigments such as alizarin and anthocyanins are not conducive to the preservation of color-sensitive devices; The cost of purifying natural pigments is relatively high; as color-sensitive materials, natural extracts can be combined with base materials through embedding, physical blending, coating, etc. leading to insignificant indication

Method used

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  • Color-sensitive indication label for detecting freshness of fishes and preparation method of color-sensitive indication label
  • Color-sensitive indication label for detecting freshness of fishes and preparation method of color-sensitive indication label
  • Color-sensitive indication label for detecting freshness of fishes and preparation method of color-sensitive indication label

Examples

Experimental program
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preparation example Construction

[0026] Preparation of polylactic acid-citrate derivatives: Place the polylactic acid pellets in an oven at 70-90°C for 3 hours, then heat the citrate derivatives with color-sensitive properties at 40-50°C to make them In a flowing state, add dicumyl peroxide, a catalyst with a mass fraction of 0.5-1.0% of the total mass of polylactic acid and citrate derivatives, into the molten citrate derivatives, stir evenly with a glass rod, and dry The polylactic acid and the color-sensitive substance are mixed in different proportions, and stirred evenly, and the mixed material is reacted at 150-200°C to form a polylactic acid-citrate derivative high molecular graft polymer.

[0027] Preparation of nanofiber membrane: granulate the extruded polylactic acid-citrate derivative, use the mixture as solute, dichloromethane / N,N-dimethylformamide as mixed solvent, dichloromethane The mass ratio of N, N-dimethylformamide is 8-12:1, magnetic stirring is carried out at room temperature for about 2...

Embodiment 1

[0033] Embodiment 1: Preparation of polylactic acid-citrate derivatives

[0034] The polylactic acid pellets were baked in an oven at 80°C for 3 hours, and then the color-sensitive citrate derivatives were heated at 40°C to make them flowable, and the mass fraction of polylactic acid and citrate derivatives was 1.0% of the total mass of the catalyst dicumyl peroxide was added to the molten citrate derivatives, stirred evenly with a glass rod, and the dried polylactic acid and the color-sensitive substance were in a mass fraction ratio of 90:10, 80 :20, 70:30, 60:40 and 50:50 are mixed separately, and stirred evenly, extruded through a twin-screw extruder, the working temperature of the twin-screw extruder is 150-200°C; through a twin-screw extruder The two can be heated and melted, and have a better mixing effect.

Embodiment 2

[0035] Embodiment 2: the preparation of common nanofiber membrane

[0036]The extruded polylactic acid-citrate derivatives were granulated, the mixture was used as the solute, dichloromethane / N,N-dimethylformamide was used as the mixed solvent, dichloromethane and N,N-di The mass ratio of methyl formamide is 10:1, and the spinning solution is prepared by magnetic stirring at room temperature for about 2 hours, and the solute mass fraction is 6%-12% respectively; 70%, electrospinning under the condition of voltage 20-40kV to obtain nanofiber membrane. Scanning electron microscope examination structure such as figure 1 shown.

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Abstract

The invention relates to a color-sensitive indication label for detecting freshness of fishes and a preparation method of the color-sensitive indication label. The color-sensitive indication label isa nanofiber membrane prepared by electrostatic spinning of graft obtained by chemical bonding of polylactic acid and citrate derivatives, and the color-sensitive indication label with a color-sensitive sensing function can be used for detecting amine substances; on one hand, the citrate derivatives and the polylactic acid are combined through chemical bonds, the defect that the physical binding force between a substrate material and a color-changing material is small is overcome, and the color-changing agent can be effectively prevented from falling off; and on the other hand, the nanofiber membrane of a multi-stage branch structure can improve the sensitivity of the color-sensitive indication label in detection of related substances, and thus the color-sensitive indication label is effectively applied to freshness detection of fresh products and the like.

Description

technical field [0001] The invention belongs to the field of color-sensitive indicator labels, in particular to a color-sensitive indicator label for detecting the freshness of fish and a preparation method thereof. Background technique [0002] During the storage of fresh fish and shrimp food, due to the decomposition of protein, volatile amine small molecular substances will be produced. The content of trimethylamine in volatile amine substances is often used as a standard to measure the freshness of fresh meat food . Detection techniques such as gas chromatography, liquid chromatography, and electronic nose have been used in the detection of trimethylamine, but the detection equipment of these methods is expensive, the detection method is complicated, and it is not easy to popularize and promote. At present, the methods commonly used to detect volatile gases released by fish such as trimethylamine mainly use metal oxide semiconductors as gas-sensing materials, synthetic ...

Claims

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Application Information

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IPC IPC(8): D04H1/728D04H1/435D04H3/02D04H3/011D01D5/00D01F6/62G01N21/78
CPCD01D5/003D01F6/625D04H1/435D04H1/728D04H3/011D04H3/02D10B2331/041G01N21/78
Inventor 王劭妤王慧程博闻万同
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY