1996 Fiscal Year Final Research Report Summary
Studies on Improvement of the Production Efficiency and In Situ Crystallization of Bacterial Cellulose
| Project/Area Number |
07660439
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
生物資源科学
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| Research Institution | Fukui National College of Technology |
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Principal Investigator |
YAMAMOTO Hiroyuki Fukui National College of Technology, General Education. Associate professor, 一般科目教室, 助教授 (00158304)
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| Co-Investigator(Kenkyū-buntansha) |
HORII Fumitaka Kyoto University, Institute for Chemical Research Professor, 化学研究所, 教授 (70124758)
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| Project Period (FY) |
1995 – 1996
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| Keywords | bacterial cellulose / microfibril / TEM / CP / MAS ^<13>C NMR / cellulose I _<alpha> and I _<beta> / in situ crystallization / production efficiency / CMC |
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| Research Abstract |
I.Improvement of the Production Efficiency of Bacterial Cellulose
(1) Effects of the addition of metal salts
The addition of Mg salt and di-Potassium Hydrogenphosphate gave higher cellulose yiels than only HS medium.
(2) Effects of other addition
The high yields of bacterial cellulose were observed for the addition of Lignin and Ligninesulfonic Acid Sodium Salt.
II.In Situ Crystallization Process of Bacterial Cellulose
Native cellulose crystals are composites of two allomorphs, cellulose I _<alpha> (triclimic) and I _<beta> (monoclinic). The ratios of cellulose I _<alpha> and I _<beta> differ greatly from species to species. The mechanism of crystallization of two allomorphs is discussed by characterizing the crystallization process for bacteria cellulose, as a model system. As a result, we presume that the crystallization of cellulose I _<alpha> and I _<beta> will occur probably under shear stress and less stress, respectively.
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