Preparation of bacteria cellulose food fresh keeping membrane

A bacterial cellulose, food preservation technology, applied in the direction of microorganism-based methods, biochemical equipment and methods, flexible coverings, etc., can solve problems that have not been applied, and achieve white pollution avoidance, good elasticity, and tensile strength Good results

Inactive Publication Date: 2009-02-25
NORTHEAST DIANLI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bacterial cellulose has been used in the production of various membranes, such as proton exchange membranes, gel masks, ar

Method used

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  • Preparation of bacteria cellulose food fresh keeping membrane
  • Preparation of bacteria cellulose food fresh keeping membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of bacterial cellulose:

[0028] (1) Cultivation and isolation of Acetobacter xylinum: dilute the vinegar unstrained spirits by 100 times and inoculate in 50 mL enrichment medium. %; yeast extract 0.5%; sodium acetate 0.2%; CaCO 3 1%; use acetic acid to adjust the pH to 5.0; after sterilizing at 121°C for 30 minutes, add 2% ethanol and 0.5% nystatin, and then culture at 28°C for 5 days. is positive. Peel off the gel film on the surface of the enrichment medium, and stick this film carefully on the first separation medium plate; the percentages of each component in the separation medium to the amount of the separation medium are: glucose 5%; Peptone 0.5%; Yeast extract 0.5%; Na 2 HPO 4 12H 2 O 0.2%; KH 2 PO 4 0.1%; MgSO 4 ·7H 2 O0.025%; 0.2% citric acid; 2% agar; pH5.8; . Place the plate at 28°C for 48 hours, then pick a single colony and insert it into the slant, and then separate it by streaking three times in a row to obtain the pure strain. ...

Embodiment 2

[0031] (1) Modification of bacterial cellulose:

[0032]After the bacterial cellulose prepared in Example 1 was swollen with acetic acid for 2 hours at 20°C, it was esterified with acetic anhydride and acetic acid under the action of a concentrated sulfuric acid catalyst with a weight percentage of 98% under normal pressure. Reaction generates bacterial cellulose acetate, wherein, the mass parts ratio of bacterial cellulose and acetic anhydride is 1:6, the mass parts ratio of acetic anhydride and acetic acid is 1:3, and the concentrated sulfuric acid catalyst consumption is bacterial cellulose 0.6% of the mass, the reaction temperature is 60° C., and the time is 2 hours, to obtain a yellow bacterial cellulose acetate sol; then add water to precipitate the bacterial cellulose acetate, and then add 5% by weight of hydrogen oxide to bleach. Filter and dry at 60°C for 2 hours to obtain modified bacterial cellulose.

[0033] (2) Production of bacterial cellulose food preservation ...

Embodiment 3

[0036] (1) Modification of bacterial cellulose:

[0037] The bacterial cellulose obtained in Example 1 was swollen with acetic acid at 40°C for 1 hour, and then esterified with acetic anhydride and acetic acid under the action of a 98% concentrated sulfuric acid catalyst at normal pressure to generate acetic acid Bacterial cellulose, wherein, the mass parts ratio of bacterial cellulose and acetic anhydride is 1:7, the mass parts ratio of acetic anhydride and acetic acid is 2:7, and the concentrated sulfuric acid catalyst consumption is 0.7% of the bacterial cellulose quality , the reaction temperature was 70°C, and the time was 2.5 hours to obtain a yellow bacterial cellulose acetate sol; then add water to precipitate the bacterial acetate cellulose, then add 5% hydrogen peroxide for bleaching, filter, and Dry at 70°C for 1.5 hours to obtain modified bacterial cellulose.

[0038] (2) Production of bacterial cellulose food preservation film:

[0039] The raw material parts by...

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Abstract

The invention discloses a method for preparing a bacteria cellulose food preservative film, which comprises the steps as follows: acetic acid bacteria cellulose which is prepared by bacteria cellulose, acetic anhydride, acetic acid and 98% concentrated sulfuric acid catalyst is treated to obtain modified bacteria cellulose, wherein, the mass ratio of the bacteria cellulose to the acetic anhydride is 1:6-1:8, the mass ratio of the acetic anhydride to the acetic acid is 1:3-1:4, and the amount of the 98% concentrated sulfuric acid catalyst is 0.6-0.8% of that of the bacteria cellulose. The following components are provided according to mass ratio: 40-60 portions of the modified bacteria cellulose, 10-20 portions of glycerol and 20-40 parts of stearic acid-palmiric acid with the mass ratio of the stearic acid to the palmiric acid being 1:1, 5-10 portions of 50-60 DEG C hot absolute ethyl alcohol; the three raw materials are respectively dissolved in a small amount of the hot absolute ethyl alcohol to obtain even solutions, and the three solutions are respectively stored in a container, evenly mixed with the residual absolute ethyl alcohol added, degassed in vacuum, repeatedly coated with film for 3 times and dried to obtain the bacteria cellulose food preservative film through film stripping.

Description

technical field [0001] The invention relates to a food preservation film made of natural materials, in particular to a preparation method of bacterial cellulose food preservation film. Background technique [0002] The film-forming materials of the current food preservative film are divided into polyethylene preservative film, starch preservative film, protein preservative film, lipid preservative film, and composite film preservative film, wherein proteins such as wheat gluten, gelatin, lipid Substances include waxes, acetyl monoglyceride, etc. Composite membranes are generally composed of the above 2-3 kinds of film-forming materials. Among them, polyethylene-based plastic wraps have the largest usage, but are difficult to degrade, while other plastic wraps cost very high and are difficult to popularize and use. [0003] Bacterial cellulose is a kind of ultra-pure cellulose synthesized by microorganisms. It is a straight-chain polysaccharide formed by connecting glucopyra...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L1/12C08K5/053C08K5/09C12P19/04B65D65/02C12R1/02
Inventor 于大禹乔楠张金榜关晓辉张静刘文超于晶
Owner NORTHEAST DIANLI UNIVERSITY
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