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A preparation method of biological composite coating and intelligent colorimetric film material

A composite coating and colorimetric technology, applied in coatings, analytical materials, cellulose coatings, etc., can solve problems such as failure to meet the requirements of film use, failure to meet the needs of film formation, loss of flexibility, etc., to achieve reversibility and Good stability, extended shelf life, and improved flexibility

Active Publication Date: 2021-07-27
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, HPG membranes have low tensile strength and high hydrophilicity, which cannot meet the needs of film formation; by adding cellulose nanocrystals (CNCs), the prepared HPG / CNCs membranes obtain higher strength, but lose Without the corresponding flexibility, it cannot meet the requirements of the membrane.

Method used

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  • A preparation method of biological composite coating and intelligent colorimetric film material
  • A preparation method of biological composite coating and intelligent colorimetric film material
  • A preparation method of biological composite coating and intelligent colorimetric film material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] A preparation method for the preparation of deep co-solvents such as figure 1 Including the following steps:

[0067] Mix choline chloride and glucose at a mass ratio of 2:1, heat and stir in an oil bath at 80°C for 10 hours to obtain a colorless and transparent solution, which is a deep co-solvent.

[0068] By observing the table, it is found that the color of the deep co-solvent prepared in this embodiment is close to the transparent color.

Embodiment 2

[0069] Example 2 Preparation method optimization for preparing deep co-solvent

[0070] Adjustment 1: Adjust the glucose in Example 1 to sucrose, and keep the others unchanged to obtain a deep co-solvent.

[0071] It was found that the color of the prepared deep co-solvent was close to the transparent color.

[0072] Adjustment 2: Adjust the mass ratio of choline chloride and glucose in Example 1 to 10:1, 5:1, 1:1 and 1:5, and keep the others unchanged to obtain a deep co-solvent.

[0073] Result finds, along with the increase of choline chloride consumption, the color of co-solvent is deepened, affects the color of film itself, and is easy to solidify under normal temperature, and then is difficult to obtain application in fresh-keeping; If the amount of choline chloride is too little ( Choline chloride and glucose=1:5), the time required to form a solution is longer, and its plasticization and color enhancement are very poor; after combining with hydroxypropyl guar gum and ...

Embodiment 3

[0077] A preparation method of biological composite coating, comprising the steps of:

[0078] Dissolve 0.6g of hydroxypropyl guar gum in 60g of water for later use, add 20g of nanocellulose crystals, and then add different amounts of deep co-solvents (0, 0.1, 0.2, 0.3, 0.4g) and 0.1g of Anthocyanin, stirring at room temperature, stirring speed is 500rpm, stirring time is 3h; obtain film-forming liquid; then soak fresh blueberries, cherries, red bayberry and other fruits in the film-forming liquid for 1min, take out and dry naturally, that is, the surface layer of the fruit is formed A biocomposite coating.

[0079] The uncoated fruit is regarded as the control group, and the coated fruit is regarded as the experimental group. They are placed under the same experimental conditions (room temperature), weigh the fruit every other day, calculate the weight loss, and take pictures to record the degree of decay of the fruit (Table 1, Table 2, Table 3), such as figure 2 , image...

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Abstract

The invention discloses a preparation method of a biological composite coating and an intelligent colorimetric film material, belonging to the field of functional materials. The present invention uses hydroxypropyl guar gum (HPG) as biocomposite material base material, takes cellulose nanocrystal (CNC) as strengthening agent, depth co-solvent (DES) as plasticizer and color enhancer, anthocyanin (Anthocyanin) ) as a pH indicator, stirred at room temperature until the solution was evenly mixed to obtain a film-forming solution, sprayed the film-forming solution on the surface of the fruit, and dried to form a coating; cast the film-forming solution to form a film and dry it to obtain an intelligent colorimetric film . The biocomposite material coating and intelligent colorimetric film prepared by the present invention have the advantages of good flexibility, good barrier property, high sensitivity, good reversibility and stability, etc., and can be used as coatings for perishable fruits (such as cherries, strawberries, etc.) and perishable Freshness indicator for perishable food (e.g. meat, seafood, etc.).

Description

technical field [0001] The invention relates to a preparation method of a biological composite coating and an intelligent colorimetric film material, belonging to the field of functional materials. Background technique [0002] With the rapid development of today's economy, people's food requirements have shifted from food and clothing to nutrition and variety, and people pay more attention to food quality and safety. Due to the regional differences in the distribution of cold chain foods such as vegetables, fruits, aquatic products, meat, and dairy products in my country, and the complexity of storage and transportation, people are looking for a variety of food consumption, which also makes my country's food cold chain Logistics is facing serious challenges. At present, due to the imperfect cold chain logistics infrastructure in my country, the cold storage conditions are not good enough, the logistics speed cannot be reached, and there is a lack of a complete cold chain lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D101/04C09D105/00C09D7/63C09D7/20C08L1/04C08L5/00C08K5/1545C08J5/18G01N21/78G01N21/80A23B7/16
CPCA23B7/16C08J5/18C08J2301/04C08J2305/00C08J2401/04C08J2405/00C08K5/1545C09D101/04C09D105/00C09D7/20C09D7/63G01N21/78G01N21/80G01N2021/775C08L5/00C08L1/04
Inventor 龙柱孟亚会
Owner JIANGNAN UNIV
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