阅读说明：本技术 一种纳米保鲜膜及其在鲜切果蔬菜上的应用 (Nano preservative film and application thereof to fresh-cut fruits and vegetables ) 是由 李昌宝 辛明 李丽 孙健 何雪梅 盛金凤 孙宇 陈港辉 于 2019-10-23 设计创作，主要内容包括：本发明公开了一种纳米保鲜膜及其在鲜切果蔬菜上的应用,包括：微纤化纳米纤维素20-30份、改性壳聚糖10-20份、普鲁兰多糖13-20份、木薯淀粉7-16份、明胶4-12份、聚乳酸5-9份、柠檬酸1-3份、纳米银0.5-2份,本发明纳米保鲜膜的制备原材料采用微纤化纳米纤维素、普鲁兰多糖、木薯淀粉和明胶等多种环保级材料,使得制作的纳米保鲜膜绿色环保且无毒,在使用时,使得透气性能好,采用纳米保鲜膜覆盖在鲜切果蔬菜上,使得鲜切果蔬菜表面的保鲜天数长,减少果蔬菜的维生素损失,且对果蔬菜本身环保,有助于锁住果蔬菜的水分。(The invention discloses a nanometer preservative film and application thereof on fresh-cut fruits and vegetables, comprising the following steps: the nano preservative film is prepared from the raw materials of micro-fibrillated nano cellulose, pullulan, cassava starch, 1-3 citric acid, 0.5-2 nano silver and the like, and is green, environment-friendly and non-toxic.)

1. A nano preservative film is characterized by comprising:

20-30 parts of microfibrillated nano-cellulose, 10-20 parts of modified chitosan, 13-20 parts of pullulan, 7-16 parts of cassava starch, 4-12 parts of gelatin, 5-9 parts of polylactic acid, 1-3 parts of citric acid and 0.5-2 parts of nano-silver.

2. The nano preservative film according to claim 1, wherein: 20 parts of microfibrillated nano-cellulose, 10 parts of modified chitosan, 13 parts of pullulan, 7 parts of cassava starch, 4 parts of gelatin, 5 parts of polylactic acid, 1 part of citric acid and 0.5 part of nano-silver.

3. The nano preservative film according to claim 1, wherein: 25 parts of microfibrillated nano-cellulose, 15 parts of modified chitosan, 16 parts of pullulan, 12 parts of cassava starch, 8 parts of gelatin, 7 parts of polylactic acid, 2 parts of citric acid and 1 part of nano-silver.

4. The nano preservative film according to claim 1, wherein: 30 parts of microfibrillated nano-cellulose, 20 parts of modified chitosan, 20 parts of pullulan polysaccharide, 16 parts of cassava starch, 12 parts of gelatin, 9 parts of polylactic acid, 3 parts of citric acid and 2 parts of nano-silver.

5. The nano preservative film according to any one of claims 1 to 4, wherein: the preparation method of the nano preservative film comprises the following steps:

s1, at room temperature, putting pullulan into ethanol with volume fraction of 92%, stirring and fully dissolving to enable the mass concentration of pullulan to be 16% -18%, adding modified chitosan and modified chitosan after fully dissolving, continuing to dissolve, and adding microfibrillated nano-cellulose after dissolving to obtain a primary spinning solution;

s2, taking a proper amount of deionized water, adding gelatin and tapioca starch into the deionized water, heating and stirring to fully dissolve the gelatin, cooling to form a mixed solution, and pouring the mixed solution into the primary spinning solution to obtain a basic spinning solution;

s3, adding polylactic acid, citric acid and nano silver into the basic spinning solution, fully stirring until the polylactic acid, the citric acid and the nano silver are dissolved uniformly, and standing until bubbles in the solution completely disappear to obtain the spinning solution;

s4, placing the spinning solution on an electrostatic spinning machine for spinning, wherein the electrostatic voltage of the electrostatic spinning machine is as follows: 16kv-18kv, acceptance distance: 14-16 cm; and obtaining the non-woven fabric type nano preservative film, wherein the thickness of the nano preservative film is 0.08-0.10 mm.

6. The nano preservative film and the application thereof on fresh-cut fruits and vegetables according to claim 1, are characterized in that: room temperature of electrospinning: 20-25 ℃ and air humidity: 45 to 65 percent.

7. The application of the nano preservative film according to any one of claims 1 to 6 on fresh-cut fruits and vegetables, which is characterized in that:

s1, selecting the size of the nano preservative film: selecting the size of the corresponding nano preservative film according to the volume and the area of the fresh-cut fruits and vegetables;

s2, wrapping with a nano preservative film: the nanometer preservative film is covered on the section of the fruit and vegetable, the fruit and vegetable are completely wrapped by the nanometer preservative film, and then the air between the nanometer preservative film and the surface of the fruit and vegetable is extruded by extrusion, so that the nanometer preservative film is completely attached to the surface of the fruit and vegetable.

Technical Field

The invention relates to the technical field of preservative films, in particular to a nano preservative film and application thereof to fresh-cut fruits and vegetables.

Background

The preservative film is a plastic packaging product, is generally used for the occasions of microwave oven food heating, refrigerator food preservation, fresh and cooked food packaging and the like, is widely applied in the food packaging field of family life, supermarket stores, hotels and restaurants and industrial production,

fresh-cut fruits and vegetables, also known as semi-processed vegetables and fruits, refer to products which are prepared by grading, sorting, cleaning, slitting, preserving , packaging and the like on fresh vegetables and keep the products in a raw state. With the acceleration of modern life rhythm and the continuous improvement of standard of living, people's demand to vegetables consumption is higher and higher, along with the continuous development of urban environment construction, it is higher and higher to reduce the call of municipal refuse, and a large amount of farmer's markets are rebuilt into the supermarket, and fresh-cut vegetables generally utilize plastic wrap parcel after cutting.

The existing preservative film has large harm and high pollution to things due to the problem of the material, the water loss is serious after the existing preservative film wraps the fresh-cut fruits and vegetables, and the vitamin C loss of the fresh-cut fruits and vegetables is serious, so that the preservation and the eating of the fresh-cut fruits and vegetables are not facilitated.

Disclosure of Invention

The invention aims to provide a nano preservative film and application thereof on fresh-cut fruits and vegetables, and aims to solve the problems that the existing preservative film in the background technology is relatively harmful and has high pollution to things due to the problem of material per se, the existing preservative film has serious water loss after wrapping the fresh-cut fruits and vegetables, the vitamin C loss of the fresh-cut fruits and vegetables is serious, and the preservation and eating of the fresh-cut fruits and vegetables are not facilitated.

In order to achieve the purpose, the invention provides the following technical scheme: a nanometer preservative film and application thereof on fresh-cut fruits and vegetables comprise:

20-30 parts of microfibrillated nano-cellulose, 10-20 parts of modified chitosan, 13-20 parts of pullulan, 7-16 parts of cassava starch, 4-12 parts of gelatin, 5-9 parts of polylactic acid, 1-3 parts of citric acid and 0.5-2 parts of nano-silver.

Preferably, the composition comprises 20 parts of microfibrillated nano-cellulose, 10 parts of modified chitosan, 13 parts of pullulan, 7 parts of cassava starch, 4 parts of gelatin, 5 parts of polylactic acid, 1 part of citric acid and 0.5 part of nano-silver.

Preferably, 25 parts of microfibrillated nano-cellulose, 15 parts of modified chitosan, 16 parts of pullulan, 12 parts of cassava starch, 8 parts of gelatin, 7 parts of polylactic acid, 2 parts of citric acid and 1 part of nano-silver.

Preferably, 30 parts of microfibrillated nano-cellulose, 20 parts of modified chitosan, 20 parts of pullulan, 16 parts of cassava starch, 12 parts of gelatin, 9 parts of polylactic acid, 3 parts of citric acid and 2 parts of nano-silver.

Preferably, the preparation method of the nano preservative film comprises the following steps:

s1, at room temperature, putting pullulan into ethanol with volume fraction of 92%, stirring and fully dissolving to enable the mass concentration of pullulan to be 16% -18%, adding modified chitosan and modified chitosan after fully dissolving, continuing to dissolve, and adding microfibrillated nano-cellulose after dissolving to obtain a primary spinning solution;

s2, taking a proper amount of deionized water, adding gelatin and tapioca starch into the deionized water, heating and stirring to fully dissolve the gelatin, cooling to form a mixed solution, and pouring the mixed solution into the primary spinning solution to obtain a basic spinning solution;

s3, adding polylactic acid, citric acid and nano silver into the basic spinning solution, fully stirring until the polylactic acid, the citric acid and the nano silver are dissolved uniformly, and standing until bubbles in the solution completely disappear to obtain the spinning solution;

s4, placing the spinning solution on an electrostatic spinning machine for spinning, wherein the electrostatic voltage of the electrostatic spinning machine is as follows: 16kv-18kv, acceptance distance: 14-16 cm; and obtaining the non-woven fabric type nano preservative film, wherein the thickness of the nano preservative film is 0.08-0.10 mm.

Preferably, room temperature of electrospinning: 20-25 ℃ and air humidity: 45 to 65 percent.

An application of a nanometer preservative film on fresh-cut fruits and vegetables,

s1, selecting the size of the nano preservative film: selecting the size of the corresponding nano preservative film according to the volume and the area of the fresh-cut fruits and vegetables;

s2, wrapping with a nano preservative film: the nanometer preservative film is covered on the section of the fruit and vegetable, the fruit and vegetable are completely wrapped by the nanometer preservative film, and then the air between the nanometer preservative film and the surface of the fruit and vegetable is extruded by extrusion, so that the nanometer preservative film is completely attached to the surface of the fruit and vegetable.

The invention provides a nano preservative film and application thereof to fresh-cut fruits and vegetables, and the nano preservative film has the following beneficial effects:

(1) the raw materials for preparing the nano preservative film disclosed by the invention adopt various environment-friendly materials such as microfibrillated nano cellulose, pullulan, tapioca starch, gelatin and the like, so that the prepared nano preservative film is environment-friendly and nontoxic, and has good air permeability when being used.

(2) The nanometer preservative film is covered on the fresh-cut fruits and vegetables, so that the fresh-keeping days on the surfaces of the fresh-cut fruits and vegetables are long, the vitamin loss of the fruits and vegetables is reduced, the environment is protected for the fruits and vegetables, and the moisture of the fruits and vegetables is favorably locked.

Drawings

FIG. 1 is a table showing the effect of the preservative film of the present invention on the number of days for preserving fresh-cut fruits and vegetables;

FIG. 2 is a table showing the effect of the preservative film of the present invention on the weight loss rate of fresh-cut fruit and vegetable;

FIG. 3 shows the effect of the preservative film of the present invention on the vitamin C loss rate of fresh-cut fruits and vegetables.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.