Preparation method and application of chitosan-fish skin gelatin composite film coating agent

A technology of fish skin gelatin and chitosan, which is applied in application, protection of fruits/vegetables with coating protection layer, food preservation, etc. It can solve the problems of passion fruit surface shrinkage, fruit commercial rate decline, and weaken fruit disease resistance, etc. , to achieve the effects of enhancing stability, reducing respiratory intensity and ethylene release rate, and prolonging the storage period at room temperature

Active Publication Date: 2022-04-29
QUANZHOU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After dehydration, the surface of passion fruit shrinks and loses luster, which greatly weakens the disease resistance of the fruit and greatly reduces the commodity rate of the fruit

Method used

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  • Preparation method and application of chitosan-fish skin gelatin composite film coating agent
  • Preparation method and application of chitosan-fish skin gelatin composite film coating agent
  • Preparation method and application of chitosan-fish skin gelatin composite film coating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of chitosan-fish skin gelatin composite coating agent:

[0031] Add 0.6mol / L HCl (mass ratio of dry fish skin to 0.6mol / L HCl: 1:5) to 10 g of dried fish skin after fat removal for 15 minutes, then rinse until neutral, add 90 mL of deionized water, and set the temperature at 95 ° C, 40 KHz Ultrasonic hydrolysis at constant temperature for 3 hours under the conditions, then adding glycerin, chitosan and ε-polylysine to obtain a mixture, and stirring the mixture at room temperature for 30 minutes, the chitosan-fish skin gelatin composite coating film can be obtained; wherein glycerin, chitosan and ε-polylysine The mass fractions of ε-polylysine in the mixture were 2%, 1% and 0.5%, respectively.

experiment example 1

[0033] The mass fraction of glycerol in the mixture is adjusted to 0%, 0.5%, 1%, 1.5%, 2%, 2.5% and 3% respectively, and other operations are the same as in Example 1 to prepare chitosan-fish skin gelatin composite coatings respectively. film agent.

[0034] The mechanical properties of the prepared chitosan-fish skin gelatin composite coating agent are evaluated, and the results are shown in table 1. It can be seen that when the mass fraction of glycerol in the mixture is 2%, the chitosan-fish skin gelatin composite The mechanical properties of the coating agent are the best.

[0035] Table 1

[0036] Glycerin addition ratio Stretch distance (mm) Elongation at break (%) 0.5％ 15.36±1.27 56.88±1.65 1％ 19.84±1.45 68.74±1.37 1.5％ 21.99±1.23 74.93±1.78 2％ 22.03±1.88 75.35±2.85 2.5％ 21.03±1.97 74.21±1.04 3％ 20.43±2.24 70.69±2.49

Embodiment 2

[0050] Select the healthy passion fruit fruit with roughly the same degree of maturity, no damage by diseases and insect pests and damage, respectively adopt 1% ​​chitosan, the chitosan-fish skin gelatin composite coating film prepared by embodiment 1, the fish skin gelatin prepared by comparative examples 1-4 Or composite coating film for coating treatment, a group of clear water as a control (see Table 2 for details), after packaging, store in a constant temperature and humidity incubator at 25 (± 1) °C and 85% humidity, and compare the relevant fruits after 12 days of storage Storage effect and quality evaluation index (Table 3).

[0051] Table 2

[0052] group coating film Preparation CK clear water / 1 1% Chitosan Chitosan (CTS) 40g dissolved in 360g water (containing 1% acetic acid) 2 Example 1 Same as Example 1 3 Comparative example 1 Same as Comparative Example 1 4 Comparative example 2 Same as comparative example 2...

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Abstract

The invention discloses a preparation method and application of a chitosan-fish skin gelatin composite film coating agent, and relates to the technical field of food preservation. The preparation method comprises the following steps: (1) adding fat-removed dry fish skin into an HCl solution, carrying out soaking treatment, washing to be neutral, adding deionized water, and carrying out ultrasonic hydrolysis to obtain hydrolysate; and (2) adding glycerol, chitosan and epsilon-polylysine into the hydrolysate to obtain a mixture, and stirring and mixing the mixture to obtain the chitosan-fish skin gelatin composite film coating agent. The chitosan-fish skin gelatin composite film coating agent prepared by the preparation method disclosed by the invention can be used for remarkably reducing water loss, shrinkage and decay of passion fruits in a storage period, improving the storage quality of the fruits and prolonging the storage period of the fruits.

Description

technical field [0001] The invention relates to the technical field of food preservation, in particular to a preparation method and application of a chitosan-fish skin gelatin composite coating agent. Background technique [0002] Passion fruit belongs to the Passiflora family Passiflora, a kind of vine. The stem of passion fruit has thin stripes, the berry is ovoid, hairless, the juice is rich in nutrition, and the smell is fragrant. The country of origin of passion fruit is located in the tropics. Brazil, South America, was introduced to Europe from South America in the 18th century, and then to China from Europe. Passion fruit is rich in protein, fat, sugar, vitamins and amino acids, etc. In addition, passion fruit also contains a variety of organic acids and aromatic substances, which can be used to make fruit juice. [0003] The water content of freshly picked passion fruit is very high. If no effective measures are taken to deal with it, the water of passion fruit wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B7/16A23B7/154
CPCA23B7/16A23B7/154A23V2002/00A23V2200/10A23V2250/511A23V2250/5432A23V2300/48Y02A40/90
Inventor 陈洪彬王慧玲郑宗平王宝贝蒋璇靓
Owner QUANZHOU NORMAL UNIV
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