First, chitin membrane: chitin membrane is one of the earliest used fine coated material. So far, the fresh-keeping experiments that have been done on chitin include strawberries, tomatoes, and bananas. Some people in China had applied chitin coating treatment to kiwifruit and achieved satisfactory results.
Second, cellulose film: modified cellulose has good film-forming performance, but poor permeability for gas permeability. In foreign studies, fatty acids, glycerol, and proteins are usually added to improve their performance. At present, there have been many researches on cellulose membranes, but only in the application of cellulose membranes in China, few studies have been done on the improvement of membrane properties.
Third, the starch film: starch film is the most widely used agricultural raw materials, it is a renewable resource, cheap and easy to get, easy to grasp the nature, with starch as a coating material has a broad application prospects. Research on starch film is still in its infancy and there is still a lot of work to be done.
Fourth, konjac edible film: konjac flour hydrosol film under appropriate conditions. The use of 0.5% konjac flour combined with 500 mg/L 2,4-D, GA3 and carbendazim to preserve fresh carrots was not effective. Recently, the use of sodium hydroxide modified konjac flour, konjac flour and xanthan blend film is expected to improve the preservation of konjac edible film.
5. Sodium alginate film: Alginic acid is a polymer of uronic acid and has good film forming properties. The sodium alginate coating had a significant effect on the preservation of Red Fuji apple. The preservation of carrots with sodium alginate film had a lower decay rate than that of cellulose films and konjaku flour films.
6. Wheat Protein Membrane: The wheat protein was treated with 95% alcohol and glycerin to obtain a flexible, high-strength and transparent film. Using a cross-linking agent, the resulting membrane has a lower oxygen permeability, and the strength and stretchability of the membrane is improved by 4 to 5 times than before.
Seven, composite membrane: composite membrane is made of sugar, fat, protein through a certain process of the formation of the film. Some people in China have used this composite membrane to preserve Yangshan Peach, which has a good effect. The Japanese used polymer solutions such as starch and protein, plus a mixture of vegetable oils to spray on citrus and apples, which could extend storage life by five times.
Second, cellulose film: modified cellulose has good film-forming performance, but poor permeability for gas permeability. In foreign studies, fatty acids, glycerol, and proteins are usually added to improve their performance. At present, there have been many researches on cellulose membranes, but only in the application of cellulose membranes in China, few studies have been done on the improvement of membrane properties.
Third, the starch film: starch film is the most widely used agricultural raw materials, it is a renewable resource, cheap and easy to get, easy to grasp the nature, with starch as a coating material has a broad application prospects. Research on starch film is still in its infancy and there is still a lot of work to be done.
Fourth, konjac edible film: konjac flour hydrosol film under appropriate conditions. The use of 0.5% konjac flour combined with 500 mg/L 2,4-D, GA3 and carbendazim to preserve fresh carrots was not effective. Recently, the use of sodium hydroxide modified konjac flour, konjac flour and xanthan blend film is expected to improve the preservation of konjac edible film.
5. Sodium alginate film: Alginic acid is a polymer of uronic acid and has good film forming properties. The sodium alginate coating had a significant effect on the preservation of Red Fuji apple. The preservation of carrots with sodium alginate film had a lower decay rate than that of cellulose films and konjaku flour films.
6. Wheat Protein Membrane: The wheat protein was treated with 95% alcohol and glycerin to obtain a flexible, high-strength and transparent film. Using a cross-linking agent, the resulting membrane has a lower oxygen permeability, and the strength and stretchability of the membrane is improved by 4 to 5 times than before.
Seven, composite membrane: composite membrane is made of sugar, fat, protein through a certain process of the formation of the film. Some people in China have used this composite membrane to preserve Yangshan Peach, which has a good effect. The Japanese used polymer solutions such as starch and protein, plus a mixture of vegetable oils to spray on citrus and apples, which could extend storage life by five times.
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