阅读说明：本技术 一种由褐藻提取的可溶性膳食纤维保鲜膜及其制备方法 (A soluble dietary fiber plastic wrap extracted from brown algae and its preparation method ) 是由 刘钟栋 石俊英 于 2019-09-26 设计创作，主要内容包括：本发明所提供的一种具有膳食纤维功能的褐藻提取物,是按如下步骤提取的：(1)将褐藻加水浸泡、洗涤,制成浆液；(2)将所述浆液中加入甲醇溶液并萃取；(3)将所述浆液过320目筛网,过滤并收集清液；(4)将所述溶液去甲醇后,调节pH为4-5；(5)将中和后的提取液加入盐类、助剂混合均匀并烘干得到半成品褐藻提取物；(6)将所述溶液在0-25℃、避光浸提后对提取液进行抽滤；(7)将浸提液进行低温浓缩,浓缩产物进行冷冻干燥,得提取物半成品；(8)将所述半成品与对羟基苯甲酸丁酯钠混合磨粉；(9)保鲜膜制备,玻璃板放入干燥箱中在不同温度下干燥,然后揭膜、贮存。(The brown algae extract with the dietary fiber function provided by the invention is extracted according to the following steps: (1) soaking brown algae in water, washing, and making into slurry; (2) adding a methanol solution to the slurry and extracting; (3) passing the slurry through a 320 mesh screen, filtering and collecting a clear solution; (4) after removing methanol from the solution, adjusting the pH value to 4-5; (5) adding salt and an auxiliary agent into the neutralized extract, uniformly mixing and drying to obtain a semi-finished brown algae extract; (6) leaching the solution at 0-25 ℃ in the dark, and then carrying out suction filtration on the extract; (7) concentrating the leaching solution at low temperature, and freeze-drying the concentrated product to obtain semi-finished product of the extract; (8) mixing the semi-finished product with sodium butyl p-hydroxybenzoate and grinding into powder; (9) preparing preservative film, drying the glass plate in a drying box at different temperatures, uncovering the film and storing.)

1. A method for preparing a soluble dietary fiber preservative film extracted from brown algae comprises the following steps:

(1) soaking fresh brown algae in water, washing, and making into slurry;

(2) adding a methanol solution into the slurry and extracting;

(3) passing the slurry through a 320-mesh screen, filtering to remove impurities and collecting clear liquid;

(4) after removing methanol from the solution, adjusting the pH value to 4-5;

(5) adding salt (such as anhydrous sodium sulfate) and adjuvant (such as sorbitol) into the neutralized brown algae extractive solution, mixing, kneading, granulating, and oven drying to obtain semi-finished brown algae extract with water content of 15%; the using amount of sorbitol is 18 percent of the mass of the brown algae, and the using amount of anhydrous sodium sulfate is 7 percent of the mass of the brown algae;

(6) leaching the solution at 0-25 ℃ in the dark, and then carrying out suction filtration on the extract to obtain a leaching solution;

(7) concentrating the leaching solution at low temperature, and freeze-drying the concentrated product to obtain brown algae extract powder semi-finished product;

(8) mixing the semi-finished product with sodium butyl p-hydroxybenzoate and grinding into powder to obtain brown algae extract with dietary fiber function; the dosage of the butyl p-hydroxybenzoate sodium is 0.45 percent of the quality of the semi-finished brown algae extract;

(9) preparing a preservative film: accurately weighing 10.000g of sodium alginate in a beaker by using a balance, stirring and dissolving the sodium alginate in a certain amount of distilled water at 70 ℃, cooling the dissolved sodium alginate, and adding the dissolved potassium sorbate, sodium benzoate and sodium benzoate

2. The brown algae extract with dietary fiber function according to claim 1, wherein: the brown algae in the step (1) comprise one or more of kelp, sargassum thunbergii, gulfweed, fucus vesiculosus, goose intestine vegetable, sargassum pallidum, kelp, undaria pinnatifida, kohlrabi or kelp, the soaking time is 3-12h, and the water consumption is 3-6 times of the mass of the brown algae.

3. The brown algae extract with dietary fiber function according to claim 1, wherein: the material-liquid ratio of the brown algae to the alcohol solvent is 1: 3-5.

4. The brown algae extract with dietary fiber function according to claim 1, wherein: the methanol removal of the obtained clear liquid is realized by adopting vacuum pumping, and citric acid is used for adjusting the pH.

5. The brown algae extract with dietary fiber function according to claim 1, wherein: the using amount of the sorbitol is 18% of the mass of the brown algae, and the using amount of the anhydrous sodium sulfate is 7% of the mass of the brown algae.

6. The brown algae extract with dietary fiber function according to claim 1, wherein: the dosage of the sodium butyl p-hydroxybenzoate is 0.45% of the quality of the semi-finished brown algae extract.

7. The brown algae extract with dietary fiber function according to claim 1, wherein: the volume fraction of glycerol is 1.16%; the speed of the constant temperature oscillator was 100 r/min.

Technical Field

The invention relates to a soluble dietary fiber preservative film extracted from brown algae and a preparation method thereof.

Background

Dietary fiber is a composite mixture of polymers, and is an important food nutrient required by human digestive process. Research shows that the dietary fiber has the physiological functions of relaxing the bowels, preventing constipation and colon cancer, reducing cholesterol in blood, reducing blood sugar, treating diabetes and the like.

The algin is a polysaccharide macromolecular carbohydrate extracted from the cell wall of algae of Phaeophyta such as Laminaria japonica, Sargassum, etc., and contains a large amount of dietary fiber, and has unique nutritive value; the content of soluble polysaccharide is quite high, the soluble polysaccharide is a high-quality raw material for extracting high-activity dietary fiber, and the soluble polysaccharide can delay the emptying of the stomach and the time for food to pass through the small intestine in a human body; can absorb water in vivo to form a filtering system to promote digestion and absorption of various nutrients; it also can reduce organic substances in human body and cholesterol. Therefore, algin is widely used as an aid in the food, textile, rubber, pharmaceutical and other industries.

The preservative film is generally formed by covering an edible coating material on the surface of food by dipping, smearing or spraying, and has a seal. The film can effectively control the permeation of oxygen, moisture or other substances, delay the oxidative rancidity of fat, inhibit the growth of microorganisms and prolong the quality guarantee period of food; the soluble dietary fiber preservative film is a polysaccharide preservative film which is a film with a certain reticular structure prepared by using polysaccharide polymers as main raw materials, such as sodium alginate, coating agent chitosan, pectin, konjac gum and the like, and modifying the polysaccharide polymers by using a plasticizer.

Disclosure of Invention

The invention aims to provide a soluble dietary fiber preservative film extracted from brown algae and a preparation method thereof.

The soluble dietary fiber preservative film extracted from brown algae provided by the invention is extracted according to the following steps:

(1) soaking fresh brown algae in water, washing, and making into slurry;

(2) adding a methanol solution into the slurry and extracting;

(3) passing the slurry through a 320-mesh screen, filtering to remove impurities and collecting clear liquid;

(4) after removing methanol from the solution, adjusting the pH value to 4-5;

(5) adding salt (such as anhydrous sodium sulfate) and adjuvant (such as sorbitol) into the neutralized brown algae extractive solution, mixing, kneading, granulating, and oven drying to obtain semi-finished brown algae extract with water content of 15%; the using amount of sorbitol is 18 percent of the mass of the brown algae, and the using amount of anhydrous sodium sulfate is 7 percent of the mass of the brown algae;

(6) leaching the solution at 0-25 ℃ in the dark, and then carrying out suction filtration on the extract to obtain a leaching solution;

(7) concentrating the leaching solution at low temperature, and freeze-drying the concentrated product to obtain brown algae extract powder semi-finished product;

(8) mixing the semi-finished product with sodium butyl p-hydroxybenzoate and grinding into powder to obtain brown algae extract with dietary fiber function; the dosage of the butyl p-hydroxybenzoate sodium is 0.45 percent of the quality of the semi-finished brown algae extract;

(9) preparing a preservative film: accurately weighing 10.000g of sodium alginate in a beaker by using a balance, stirring and dissolving the sodium alginate in a certain amount of distilled water at 70 ℃, cooling the dissolved sodium alginate, and adding the dissolved potassium sorbate, sodium benzoate and sodium benzoate

Glycerol was added in a volume fraction of 1.16%, while stirring with a constant temperature shaker at a rate of 100 r/min. Filtering the uniformly stirred solution on a 60-mesh stainless steel sieve to remove undissolved residues; and weighing a certain amount of film liquid, pouring the film liquid on a glass plate coated with a release agent, and performing tape casting to form the film. And (3) drying the glass plate in a constant temperature and humidity drying box for a certain time at different temperatures, and then uncovering the film and storing.

Compared with the prior art, the invention has the advantages and positive effects that: (1) the preparation process of the invention takes brown algae as the main raw material, which can reduce the production cost; the preparation process is simple and easy to implement and popularize; has important practical significance for improving the dietary structure of human beings and promoting economic development. (2) The brown algae of the invention contains rich algin, cellulose, hemicellulose, mineral substances and the like, and is a high-quality raw material for producing dietary fiber; (3) the brown algae extraction method greatly saves and utilizes natural resources and reduces the pollution to the environment; (4) the brown algae of the invention is a natural food, has good food safety, and does not introduce harmful substances in the extraction process of the brown algae, thereby still maintaining good edible safety.

Detailed Description

The following detailed description of specific embodiments of the present invention is provided to illustrate and explain the present invention and to be understood not to limit the present invention.

The invention provides a soluble dietary fiber preservative film extracted from brown algae, which is extracted according to the following steps:

(1) soaking fresh brown algae in water, washing, and making into slurry;

(2) adding a methanol solution into the slurry and extracting;

(3) passing the slurry through a 320-mesh screen, filtering to remove impurities and collecting clear liquid;

(4) after removing methanol from the solution, adjusting the pH value to 4-5;

(5) adding salt (such as anhydrous sodium sulfate) and adjuvant (such as sorbitol) into the neutralized brown algae extractive solution, mixing, kneading, granulating, and oven drying to obtain semi-finished brown algae extract with water content of 15%; the using amount of sorbitol is 18 percent of the mass of the brown algae, and the using amount of anhydrous sodium sulfate is 7 percent of the mass of the brown algae;

(6) leaching the solution at 0-25 ℃ in the dark, and then carrying out suction filtration on the extract to obtain a leaching solution;

(7) concentrating the leaching solution at low temperature, and freeze-drying the concentrated product to obtain brown algae extract powder semi-finished product;

(8) mixing the semi-finished product with sodium butyl p-hydroxybenzoate and grinding into powder to obtain brown algae extract with dietary fiber function; the dosage of the butyl p-hydroxybenzoate sodium is 0.45 percent of the quality of the semi-finished brown algae extract;

(9) preparing a preservative film: accurately weighing 10.000g of sodium alginate in a beaker by using a balance, stirring and dissolving the sodium alginate in a certain amount of distilled water at 70 ℃, cooling the dissolved sodium alginate, and adding the dissolved potassium sorbate, sodium benzoate and sodium benzoateGlycerol was added in a volume fraction of 1.16%, while stirring with a constant temperature shaker at a rate of 100 r/min. Filtering the uniformly stirred solution on a 60-mesh stainless steel sieve to remove undissolved residues; weighing a certain amount of membrane liquid, pouring the membrane liquid coated with the release agentThe glass plate of (2) is cast into a film. And (3) drying the glass plate in a constant temperature and humidity drying box for a certain time at different temperatures, and then uncovering the film and storing.

In the step (1), the brown algae comprises one or more of kelp, undaria pinnatifida, Ascophyllum nodosum, gulfweed and kelp, the soaking time is 3-12h, the water consumption is 3-6 times of the mass of the brown algae, and impurity particles in the brown algae can be removed by soaking and washing the brown algae in water.

In the step (2), the material-to-liquid ratio of the brown algae serous fluid to the alcohol solvent is 1: 3-5.

In the step (3), the methanol in the obtained clear liquid is removed by vacuumizing.

In the step (4), citric acid is used for adjusting the pH of the solution.

In the step (5), the using amount of sorbitol is 18% of the mass of the brown algae, and the using amount of anhydrous sodium sulfate is 7% of the mass of the brown algae;

the advantages and positive effects of the invention include:

(1) the preparation process of the invention takes brown algae as the main raw material, which can reduce the production cost; the preparation process is simple, easy to implement and popularize, and has important practical significance for improving the dietary structure of human beings and promoting economic development;

(2) the seaweed contains rich algin, cellulose, hemicellulose, mineral substances and the like, and is a high-quality raw material for producing dietary fiber;

(3) the brown algae extraction method greatly saves and utilizes natural resources and reduces the pollution to the environment

(4) The brown algae of the invention is a natural food, has good food safety, and does not introduce harmful substances in the extraction process of the brown algae, so that the good edible safety is still maintained;