Bioreactor and method for producing microbial cellulose

a technology of microbial cellulose and bioreactor, which is applied in the direction of bioreactor/fermenter, specific use of bioreactor, biochemical apparatus and processes, etc., can solve the problems of insufficient cylinders to produce tubular microbial cellulose, laborious and time-consuming,

Inactive Publication Date: 2010-12-16
FOOD IND RES & DEV INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventionally, the production of bacterial pellicle is carried out under the condition of static cultivation, which is not only laborious but time-consuming

Method used

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  • Bioreactor and method for producing microbial cellulose
  • Bioreactor and method for producing microbial cellulose
  • Bioreactor and method for producing microbial cellulose

Examples

Experimental program
Comparison scheme
Effect test

example 1

Three Hollow Tubes Fitted Together as a Group

[0038]In this example, the bioreactor shown in FIGS. 1 and 2 was used, wherein the container 30 has a length of 33 cm, a width of 23 cm, and a height of 4 cm, and the three hollow tubes 11-13 have a length of 30 cm. The shafts 22 were driven into rotation by a motor at 10 rpm. Consequently, the horizontal module 10 was rotated horizontally at 10 rpm as well.

[0039]The bioreactor was placed in an environment free of contaminating bacteria in order to carry out microbial cultivation, in which the liquid medium 40 held in the container 30 was 35 mm of height, and the culture temperature was 30° C. The liquid medium 40 was a pre-agitated culture prepared in advance. The pre-agitated culture was a liquid medium comprising the ingredients listed in the following table and 5% microorganisms, the culture was incubated free of contaminating bacteria at 120 rpm and 30° C. for two days, and was filled with Gluconacetobacter xylinus by the time the in...

example 2

Two Hollow Tubes Fitted Together as a Group

[0042]The steps and the bioreactor employed in Example 1 were also used in this embodiment, except that the second hollow tube (with a diameter of 40 mm) from the three hollow tubes was not used.

[0043]Overall, 1.745 g / L of sheets of bacterial cellulose was obtained from the undisturbed portion of liquid medium, and two different sizes of tubular bacterial cellulose, which weighed 1.815 g / L in total; were obtained from the horizontal module, and resulted in a total harvest of 3.56 g / L in this example.

example 3

A Single Hollow Tube

[0044]The steps and the bioreactor employed in Example 1 were again used in this embodiment, except that the first and the second hollow tubes (with a diameter of 30 mm and 40 mm, respectively) from the three hollow tubes were not used.

[0045]In this example, 1.745 g / L of sheets of bacterial cellulose was obtained from the undisturbed portion of liquid medium, and one tubular bacterial cellulose, which weighed 0.77 g / L in total; was obtained from the horizontal module, and resulted in a total harvest of 2.515 g / L.

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Abstract

A technique for producing microbial cellulose is provided, including: preparing a liquid medium for microbial cultivation in a container; horizontally rotating multiple hollow tubes that are fitted together or separated from one another, so that each of the hollow tubes is alternately partially immersed in the liquid medium and partially exposed above the horizontal surface of the liquid medium; wherein each of the hollow tubes has a rough outer surface and a smooth inner surface, so as to allow microorganisms to form microbial cellulose on the outer surface of each hollow tube, as well as forming sheets of microbial cellulose on the horizontal surface of the liquid medium not being disturbed by the hollow tubes, and removing the microbial cellulose from the outer surfaces of the hollow tubes in order to obtain tubular microbial cellulose. In addition, the sheets of microbial cellulose are also harvested from the liquid medium.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a bioreactor and method for producing microbial cellulose, and more particularly to a bioreactor and method for simultaneously producing tubular microbial cellulose and sheets of microbial cellulose.DESCRIPTION OF PRIOR ART[0002]A number of bacteria, and particularly strains of Acetobacter, can be cultivated to produce bacterial cellulose. In the presence of sugar and oxygen, cells of Acetobacter synthesize cellulose extracellularly in the form of fibrils attached to the cell. The fibrils produced by cells incubated in a static culture intertwine with one another to form a hydrophilic network known as a pellicle. This pellicle forms on the air / liquid interface of the motionless and undisturbed culture which is usually contained in shallow trays. Coherent gel-like microbial cellulose pellicles have many uses such as in wound dressings, paper, cosmetics and speaker vibration membranes, after removal of the cells.[0003]Conven...

Claims

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Application Information

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IPC IPC(8): C12P19/04C12M1/24
CPCC12M27/06C12P19/04
Inventor HSIAO, HSU-CHOULU, TING-SHENGCHEN, HAN-KENLAI, JINN-TSYYLEE, FWU-LINGCHU, CHUNG-LIANGLIAO, CHII-CHERNG
Owner FOOD IND RES & DEV INST
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