| Project/Area Number |
07650946
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
生物・生体工学
|
|---|
| Research Institution | University of Tsukuba |
|---|
Principal Investigator |
OGBONNA James chukwuma University of Tsukuba, Institute of Applied Biocemistry Associate Professor, 応用生物化学系, 講師 (00261777)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
TANAKA Hideo University of Tsukuba, Institute of Applied Biocemistry Professor, 応用生物化学系, 教授 (40015657)
|
|---|
| Project Period (FY) |
1995 – 1996
|
| Project Status |
Completed (Fiscal Year 1996)
|
| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1996: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1995: ¥1,500,000 (Direct Cost: ¥1,500,000)
|
|---|
| Keywords | Loofa spong / Cell Immobilization / Immobilization carrier / Flocculating cells / Non-flocculating cells / Filamentous cells / Aerobic fermentation process / Anaerobic fermentation process / 充填層 / アミラーゼ生産 / 細胞固定化 / 物質生産 |
|---|
| Research Abstract |
Efficient immobilization of flocculating cells can be achieved by simply inoculating a reactor containing a bed of the loofa sponge with the cell suspension. The cells were trapped inside the lattice of the sponge and grew to high cell densities. In the case of non-flocculating cells, flocculation was induced by addition of flocculating agent (chitosan) and the flocculated cells were efficiently immobilized as described above. Fungi was immobilized by inoculating either spores or homogenized hyphae into a reactor containing a bed of the loofa sponge. The spores germinated inside the lattice structure of the sponge and the resulting hyphae were entangled (immobilized) on the sponge.
Although mass transfer was better in a fixed bed made of a single cylindrical sponge, the amounts of sponge per unit reactor volume and the immobilized cells per unit sponge were higher when sliced loofa sponges were used for bed construction. Thus cylindrical or sliced loofa sponges should be used for aerobi
… More
c or anaerobic fermentation processes, respectively.
As examplex of application to anaerobic fermentation, immobilized flocculating (Saccharomyces cerevisiae) or non-flocculating (Candida brassicae) was used for continuous ethanol production from molasses and sucrose medium. The processes were stable for long periods of time. In the case of aerobic processes, long term continuous glucoamylase production by Aspergillus awamori immobilized on loofa sponge was possible. Furthermore, continuous direct ethanol production from starch was achieved by using a combination of immobilized Aspergillus awamori and Saccharomyces cerevisiae.
The above results have shown that representative flocculating and non-flocculating fermentation microorganisms (yeast, bacteria and fungi) can be efficiently immobilized on loofa sponge. Furthermore, by using either the cylindrical or sliced loofa sponge, suitable fixed beds for aerobic or anaerobic fermentation processes can be constructed. It can be thus concluded that bioreactor with loofa sponges has great potential for application in a wide range of fermentation processes. Less
|
