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Preparation method and application of a freshness-indicating smart label

A smart label and freshness technology, which is applied in the field of food packaging storage and detection, can solve the problems of large amount of indicator, weak fixation, high production cost, etc., achieve convenience and intuitiveness, improve fixation firmness and response sensitivity, and quickly identify food the quality of the effect

Active Publication Date: 2021-04-06
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although this type of freshness indicator card can detect the freshness of food more accurately, there are problems such as large amount of indicator, weak fixation, non-degradable base material, poor safety, and easy to be interfered by the outside world. Complicated and expensive to produce
[0004] In addition, most of the existing freshness indicator cards are used as a separate indicator label, which can only give a qualitative judgment on the freshness of the food, and the label itself does not carry any other information about the food

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of a freshness indicating smart label is as follows:

[0024] (1) Label substrate pretreatment:

[0025] Use low-temperature plasma to pretreat the surface of polycaprolactone (PCL) film as the label substrate. The low-temperature plasma treatment process conditions are: the ratio of air flow to oxygen flow is 2:1, and the air flow is 0.5L / min ;The current is set to 0.8A, the voltage is 150V; the vacuum is 1600Pa; the processing time is 1min;

[0026] (2) Preparation of nanocellulose film-forming solution containing color developer:

[0027] Anthocyanin natural pigment powder is dissolved in ethanol solution with a volume concentration of 70%, and magnetically stirred at room temperature for 1 hour to prepare a pigment solution with a pigment concentration of 3%; it is prepared by mechanical grinding method using bleached hardwood fiber as raw material Nanocellulose with a diameter of 2 to 20 nm and a length of 0.1 to 100 μm. Use distilled water ...

Embodiment 2

[0032] A preparation method of a freshness indicating smart label is as follows:

[0033] (1) Label substrate pretreatment:

[0034] Use low-temperature plasma to pretreat the surface of the polylactic acid (PLA) film as the label substrate. The low-temperature plasma treatment process conditions are: the ratio of air flow to oxygen flow is 1:1, and the air flow is 0.1L / min; The setting is 0.5A, the voltage is 100V; the vacuum is 500Pa; the processing time is 5min;

[0035] (2) Preparation of nanocellulose film-forming solution containing color developer:

[0036] Dissolve fungal-fermented natural pigment powder in an ethanol solution with a volume concentration of 70%, and magnetically stir it at room temperature for 1 hour to prepare a pigment solution with a pigment concentration of 3%. The bleached bagasse fiber is used as a raw material to prepare a diameter of 2 ~20nm nanocellulose with a length of 0.1~100μm. Use distilled water to disperse nanocellulose into a suspen...

Embodiment 3

[0041] A preparation method of a freshness indicating smart label is as follows:

[0042] (1) Label substrate pretreatment:

[0043] Use low-temperature plasma to pretreat the surface of the polylactic acid (PLA) film as the label substrate. The low-temperature plasma treatment process conditions are: the ratio of air flow to oxygen flow is 3:1, and the air flow is 0.9L / min; current The setting is 0.3A, the voltage is 200V; the vacuum is 1000Pa; the processing time is 3min;

[0044] (2) Preparation of nanocellulose film-forming solution containing color developer:

[0045] Mix methyl red powder and bromothymol blue powder according to a mass ratio of 3:2, dissolve in an ethanol solution with a volume concentration of 70%, stir magnetically at room temperature for 1 hour, and prepare a pigment solution with a pigment concentration of 3%; The nano-cellulose with a diameter of 2-20 nm and a length of 0.1-100 μm is prepared by using the bleached coniferous wood fiber as a raw mate...

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Abstract

The invention discloses a preparation method and application of a freshness indicating smart label, which belongs to the field of food packaging, storage and detection. In this method, a degradable plastic film is used as a substrate, and a pH value-responsive chromogen is combined with nanocellulose as an indicating film layer to prepare a freshness-indicating smart label. During application, the freshness-indicating smart label is sprayed or printed with a QR code or barcode that can be quickly recognized by a smartphone or a code scanner, and then placed inside the meat preparation package. The preparation process of the present invention is simple, and can be 2 The color changes with the concentration of alkaline nitrogen-containing volatile substances, objectively indicating the freshness of the food, and presenting it in the form of an identifiable label, so that consumers can scan the code to obtain the basic information of the product, and at the same time correspond to the nutritional information and shelf life of meat products Information can be displayed digitally, providing convenience for consumers to purchase safely.

Description

technical field [0001] The invention belongs to the technical field of food packaging storage and detection, in particular to a preparation method and application of a freshness indicating smart label. Background technique [0002] Fresh meat products are extremely vulnerable to microbial attack during storage and transportation, resulting in a reduction in their freshness. Microorganisms can degrade organic macromolecules such as protein in meat, and produce various volatile substances, such as carbon dioxide, alkaline nitrogen-containing volatiles, etc., resulting in changes in the pH of the packaging space. As people pay more attention to food quality and food safety, smart packaging with freshness indication function has gradually entered the public life. Smart packaging is a new packaging technology that obtains information on the quality and safety of food during transportation and storage by detecting the environmental conditions of packaged food. In the packaging o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78G06Q10/08G06Q50/28
CPCG06Q10/08G01N21/78
Inventor 吴敏高琳鲁鹏王磊刘仁
Owner GUANGXI UNIV
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