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Method for retaining freshness of food by electrostatic spraying of chitosan membrane

A chitosan film and chitosan technology, applied in coatings, chitin polysaccharide coatings, hyaluronic acid coatings, etc., can solve the problems of membrane liquid pollution, unfavorable continuous operation, waste, etc., and achieve easy operation and benefit The effect of continuous operation and elimination of membrane liquid pollution

Inactive Publication Date: 2016-12-07
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, dipping and brushing are likely to cause pollution and waste of membrane liquid, and are not conducive to continuous operation

Method used

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  • Method for retaining freshness of food by electrostatic spraying of chitosan membrane
  • Method for retaining freshness of food by electrostatic spraying of chitosan membrane
  • Method for retaining freshness of food by electrostatic spraying of chitosan membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment relates to a fresh-keeping method of electrostatically spraying chitosan, the schematic flow chart of which is as follows figure 1 As shown, it specifically includes the following steps:

[0028] The chitosan with molecular viscosity of 70mpa s and 85% degree of deacetylation is dissolved in 0.5% (v / v) acetic acid to make a solution with a concentration of 0.25% (w / v), and 0.0625% glycerin is added , 0.01% Tween 80, homogenized after stirring for 2h, and vacuum degassed for 0.5h. After sucking the chitosan film liquid in the liquid storage container into the spray gun, aim at the center of the orange on the operating rack, and adjust the distance of the spray gun to ensure that the film liquid can be evenly sprayed around the orange. The spraying rate of the spray gun is 2L / h, and the injection pressure is 1kg / cm 2 , The spray gun load current is 50mA. Use a spray gun to repeatedly spray the orange back and forth 5 times, let it stand for 5 minutes, a...

Embodiment 2

[0030] This embodiment relates to a fresh-keeping method of electrostatically spraying chitosan, the schematic flow chart of which is as follows figure 1 As shown, it specifically includes the following steps:

[0031] The chitosan with a molecular viscosity of 90mpa s and a deacetylation degree of 95% is dissolved in 2% (v / v) acetic acid to make a solution with a concentration of 1% (w / v), and 0.3% glycerin is added , 0.1% Tween 80, homogenized after stirring for 3 hours, and vacuum degassed for 1.5 hours. After sucking the chitosan film liquid in the liquid storage container into the spray gun, aim at the center of the cheese on the operating rack, and adjust the distance of the spray gun to ensure that the film liquid can be evenly sprayed around the cheese. The spraying rate of the spray gun is 5L / h, and the injection pressure is 3kg / cm 2 , The spray gun load current is 60mA. Use the spray gun to repeatedly spray the cheese back and forth 5 times, let it stand for 10 mi...

Embodiment 3

[0033] This embodiment relates to a fresh-keeping method of electrostatically spraying chitosan, the schematic flow chart of which is as follows figure 1 As shown, it specifically includes the following steps:

[0034] The chitosan with a molecular viscosity of 80mpa s and a deacetylation degree of 90% is dissolved in 1% (v / v) acetic acid to make a solution with a concentration of 0.5% (w / v), and 0.15% glycerin is added , 0.05% Tween 80, homogenized after stirring for 3 hours, and vacuum degassed for 1 hour. After sucking the chitosan film liquid in the liquid storage container into the spray gun, aim at the center of the grapes on the operating rack, and adjust the distance of the spray gun to ensure that the film liquid can be evenly sprayed around the grapes. The spraying rate of the spray gun is 4L / h, and the injection pressure is 2kg / cm 2 , The spray gun load current is 70mA. Use the spray gun to repeatedly spray the grapes back and forth 7 times, let it stand for 7 mi...

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Abstract

The invention provides a method for retaining the freshness of food by electrostatic spraying of a chitosan membrane. The technical scheme provided by the invention is that the method is used for coating freshness retaining treatment of food and belongs to the field of freshness retaining of the food. The method comprises the following steps: firstly, dissolving a chitosan base material into an acetic acid solution to prepare film forming liquid with a proper concentration; secondly, putting food on a spraying platform, and performing electrostatic film liquid spraying on the food; thirdly, standing for 5 to 10 minutes, then performing convection air drying on the film liquid, and subsequently storing the food. The method is simple and feasible in operation and facilitates the realization of continuous operation; the defects of high use amount and easy pollution of a traditional impregnation coating method can be overcome, and the spraying efficiency is improved.

Description

technical field [0001] The invention belongs to the field of food preservation, and in particular relates to a method for performing chitosan coating film preservation on food by using an electrostatic spraying technology. Background technique [0002] How to effectively extend the shelf life of food and ensure food safety has always been a hot topic in the world. Among them, choosing pure natural and low-cost biological materials to coat food to keep fresh is the research focus of researchers in my country's food and related fields. Chitosan is the only natural polysaccharide with basic amino groups. It has good film-forming properties, biocompatibility, antibacterial properties and various biological activities. It has been widely used in the field of food preservation. [0003] Commonly used coating methods include dip coating, brush coating and spray coating etc., disclose a kind of preparation method of chitosan-based composite fresh-keeping film or coating as Chinese ...

Claims

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Application Information

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IPC IPC(8): C09D105/08C09D5/46C09D7/12
CPCC09D105/08C09D7/63C09D7/65C08L71/02C08K5/053
Inventor 钟宇赵艳云庄晨俊江永利
Owner SHANGHAI JIAO TONG UNIV