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Method for preparing bacterial cellulose membrane with high rehydration

A bacterial cellulose membrane and high rehydration technology, applied in the field of biomaterials, can solve the problems of application limitations, gel membranes not having the state and properties of gel membranes, and damage to the excellent properties of gel membranes, achieving high rehydration rates and high Effect of rehydration and reswellability

Inactive Publication Date: 2009-12-02
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bacterial cellulose gel film has a high water content, and its water holding capacity can reach 100 times the weight of the bacterial cellulose. When it is dried to remove moisture, it becomes a thin, hard and dense translucent bacterial cellulose dry film, because the bacterial cellulose There are a lot of hydroxyl groups in the cellulose, which can form strong intramolecular and intermolecular hydrogen bonds. The effect of this hydrogen bond makes the rehydration rate of the dried film only reach 3-5 times the weight of bacterial cellulose, so after drying Gel films do not have the state and properties of gel films, and many of the excellent properties of gel films are destroyed so that their applications are limited

Method used

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  • Method for preparing bacterial cellulose membrane with high rehydration
  • Method for preparing bacterial cellulose membrane with high rehydration
  • Method for preparing bacterial cellulose membrane with high rehydration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of high rehydration bacterial cellulose membrane, the preparation steps are:

[0025] (1) 100 g of bacterial cellulose hydrogel membranes (containing 1.13 g of bacterial cellulose) from which bacteria and culture medium have been removed are immersed in a 2% NaOH aqueous solution, and treated with stirring for 1 hour at room temperature;

[0026] (2) soaking the treated film with etherifying agent propylene oxide at a constant temperature of 30°C for 20 hours;

[0027] (3) neutralize the reaction solution with an acidic solution of acetic acid to neutrality and stir for 1 hour, and finally rinse the membrane with a large amount of distilled water to obtain a hydroxypropylated bacterial cellulose membrane.

[0028] (4) The hydroxypropylated bacterial cellulose membrane is placed on a polytetrafluoroethylene membrane, dried in a 60° C. blast dryer for 2.5 hours, and taken out to obtain a highly rehydrated bacterial cellulose membrane.

[0029] Detect...

Embodiment 2

[0032] A preparation method of high rehydration bacterial cellulose membrane, the preparation steps are:

[0033] (1) Immerse 100 g of bacterial cellulose hydrogel membrane (containing 1.12 g of bacterial cellulose) from which bacteria and culture medium have been removed in a NaOH / urea aqueous solution with a concentration of 2% / 2%, and stir at room temperature. 1 hour.

[0034] (2) Soak the treated membrane with etherifying agent propylene oxide at a constant temperature of 30° C. for 20 hours.

[0035] (3) neutralize the reaction solution with an acidic solution acetic acid to neutrality and stir for 1 hour, and then rinse the membrane with a large amount of distilled water to obtain a hydroxypropylated bacterial cellulose membrane.

[0036] (4) The hydroxypropylated bacterial cellulose membrane is placed on a polytetrafluoroethylene membrane, dried in a 60° C. blast dryer for 2.5 hours, and taken out to obtain a highly rehydrated bacterial cellulose membrane.

[0037] Te...

Embodiment 3

[0039] A preparation method of high rehydration bacterial cellulose membrane, the preparation steps are:

[0040] (1) 100 g of bacterial cellulose hydrogel membranes (containing 1.14 g of bacterial cellulose) from which bacteria and culture medium have been removed are immersed in a 4% NaOH aqueous solution, and treated with stirring at room temperature for 1 hour.

[0041] (2) Soak the treated membrane with etherifying agent propylene oxide at a constant temperature of 40° C. for 20 hours.

[0042] (3) neutralize the reaction solution with an acidic solution of acetic acid to neutrality and stir for 1 hour, and finally rinse the membrane with a large amount of distilled water to obtain a hydroxypropylated bacterial cellulose membrane.

[0043] (4) The hydroxypropylated bacterial cellulose membrane is placed on a polytetrafluoroethylene membrane, dried in a 60° C. blast dryer for 2.5 hours, and taken out to obtain a highly rehydrated bacterial cellulose membrane.

[0044] Det...

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Abstract

The invention relates to a method for preparing a bacterial cellulose membrane with high rehydration, which comprises the following steps: (1) performing alkaline treatment on bacterial cellulose hydrogel membrane of which bacteria and culture medium are removed; (2) performing etherification treatment on the processed membrane; (3) performing neutralization reaction on the etherified membrane to obtain a bacterial cellulose membrane subjected to hydroxypropylation; and (4) drying the bacterial cellulose membrane subjected to hydroxypropylation to obtain the bacterial cellulose membrane with high rehydration. The method aims at the defect of low rehydration performance of the prior bacterial cellulose membrane, uses a method of hydroxypropylation modification of the bacterial cellulose surface to destroy a part of hydrogen bonds in cellulose; a rehydration rate test finds that the dried bacterial cellulose membrane subjected to hydroxypropylation has high rehydration and reswelling capability; and the bacterial cellulose membrane subjected to hydroxypropylation can be used for preparing biologic composite materials, and has importance significance on biomedical materials and the like.

Description

technical field [0001] The invention belongs to the field of biological materials, and in particular relates to a preparation method of a highly rehydrated bacterial cellulose membrane. Background technique [0002] Bacterial cellulose has many excellent properties unmatched by plant cellulose. It is a natural biomaterial with good biocompatibility and flexibility, and has broad application prospects in the field of medical materials. Bacterial cellulose is mainly a metabolite secreted by Acetobacter xylinum. Cellulose molecules secreted from cell wall pores are connected to each other through hydrogen bonds to form cellulose microfibrils with a diameter of 1.78 nm. With the continuous increase of secretion amount, it extends in parallel and forward, and several adjacent microfibrils are laterally connected by hydrogen bonds to form a microfibril bundle (Bundle) with a diameter of 3-4 nm, and the microfibril bundle is further elongated. , the bundles are still connected to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08L1/02
Inventor 万同朱勇陆金昌曾威贾士儒朱会霞
Owner TIANJIN UNIV OF SCI & TECH
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