Full
Outline
To prepare a composite film with antibacterial function using chitosan (CS) and gelatin(GEL) as film-forming substrates and tea polyphenols (TP) as an active additive.
CS/GEL composite films with different TP additions were prepared by solution blending and casting method. The water content, water solubility, swelling degree, light transmittance, antibacterial activity and preservation effect on strawberries of the films were analyzed and determined.
The CS/GEL/TP composite films exhibited a smooth appearance. The introduction of TP optimized the properties of the composite films. When the TP addition was 1.5%, the composite film showed the best overall performance: the ultraviolet light transmittance was as low as 0.113%, and inhibition rates against Escherichia coli and Staphylococcus aureus reached 73.34% and 99.78%, respectively. In the strawberry preservation experiment, the composite film effectively inhibited the weight loss of the fruits, with a loss rate as low as 15.27% after 11 days, delayed the sensory deterioration of strawberries, and extended the shelf life by 4 days.
The water content, water solubility, swelling degree, ultraviolet light transmittance and antibacterial activity of the CS/GEL composite film with appropriate addition of TP are improved, effectively prolonging the preservation period of strawberries, and showing a certain application potential in the field of fruit preservation.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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