Method of preparing composite preservative film or coating from chitosan and alcohol soluble corn protein
A zein and composite fresh-keeping technology, which is applied in the direction of coating and protecting fruits/vegetables with a coating protective layer, can solve problems such as poor moisture resistance and UV protection performance, affecting freshness preservation effect, and poor mechanical properties. To achieve the effect of simple and reasonable raw material ratio, food safety, non-toxic and harmless, and easy to obtain
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[0055] Example 1:
[0056] A preparation method of a composite cling film or coating using chitosan zein as a raw material, comprising the following steps:
[0057] (1) Add 2 g of chitosan to 100 g of 2% (w / v) acetic acid aqueous solution, and at the same time add 0.4 g of glycerin, and stir until completely dissolved to prepare a 2 wt% chitosan solution;
[0058] (2) Add 2 g of zein to 100 g of 85% (w / v) ethanol aqueous solution, and at the same time add 0.4 g of glycerin, and stir until completely dissolved to prepare a 2wt% zein ethanol aqueous solution;
[0059] (3) The chitosan solution prepared in step (1) and the zein ethanol aqueous solution prepared in step (2) were mixed at a volume ratio of 2:8, and stirred at a speed of 300 r / min at 50°C for 30 Minutes later, use ultrasonic vibration for 20 minutes to remove the gas in the mixed membrane liquid to prepare the chitosan-based composite cling film membrane liquid;
[0060] (4) Casting the composite cling film liquid prepared b...
Example Embodiment
[0064] Example 2:
[0065] A method for preparing a composite cling film or coating using chitosan zein as a raw material includes the following steps:
[0066] (1) Add 2 g of chitosan to 100 g of 2% (w / v) acetic acid aqueous solution, and at the same time add 0.4 g of glycerin, and stir until completely dissolved to prepare a 2 wt% chitosan solution;
[0067] (2) Add 2 g of zein to 100 g of 85% (w / v) ethanol aqueous solution, and at the same time add 0.4 g of glycerin, and stir until completely dissolved to prepare a 2wt% zein ethanol aqueous solution;
[0068] (3) The chitosan solution prepared in step (1) and the zein ethanol aqueous solution prepared in step (2) were mixed at a volume ratio of 3:7, and stirred at a speed of 300 r / min at 50°C for 30 Minutes later, use ultrasonic vibration for 20 minutes to remove the gas in the mixed membrane liquid to prepare the chitosan-based composite cling film membrane liquid;
[0069] (4) Casting the composite cling film liquid prepared by th...
Example Embodiment
[0073] Example 3:
[0074] A preparation method of a composite cling film or coating using chitosan zein as a raw material, comprising the following steps:
[0075] (1) Add 2 g of chitosan to 100 g of 2% (w / v) acetic acid aqueous solution, and at the same time add 0.4 g of glycerin, and stir until completely dissolved to prepare a 2 wt% chitosan solution;
[0076] (2) Add 2 g of zein to 100 g of 85% (w / v) ethanol aqueous solution, and at the same time add 0.4 g of glycerin, and stir until completely dissolved to prepare a 2wt% zein ethanol aqueous solution;
[0077] (3) The chitosan solution prepared in step (1) and the zein ethanol aqueous solution prepared in step (2) were mixed at a volume ratio of 9:1, and stirred at a speed of 300 r / min at 50°C for 30 Minutes later, use ultrasonic vibration for 20 minutes to remove the gas in the mixed membrane liquid to prepare the chitosan-based composite cling film membrane liquid;
[0078] (4) Casting the composite cling film liquid prepared b...
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