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| Content Provider | Springer Nature Link |
|---|---|
| Author | Castillo, Tania Galindo, Enrique Peña, Carlos F. |
| Copyright Year | 2013 |
| Abstract | Alginates are polysaccharides that may be used as viscosifiers and gel or film-forming agents with a great diversity of applications. The alginates produced by bacteria such as Azotobacter vinelandii are acetylated. The presence of acetyl groups in this type of alginate increases its solubility, viscosity, and swelling capability. The aim of this study was to evaluate, in glucose-limited chemostat cultivations of A. vinelandii ATCC9046, the influence of dissolved oxygen tension (DO) and specific growth rate (μ) on the degree of acetylation of alginates produced by this bacterium. In glucose-limited chemostat cultivations, the degree of alginate acetylation was evaluated under two conditions of DO (1 and 9 %) and for a range of specific growth rates (0.02–0.15 h−1). In addition, the alginate yields and PHB production were evaluated. High DO in the culture resulted in a high degree of alginate acetylation, reaching a maximum acetylation degree of 6.88 % at 9 % DO. In contrast, the increment of μ had a negative effect on the production and acetylation of the polymer. It was found that at high DO (9 %) and low μ, there was a reduction of the respiration rate, and the PHB accumulation was negligible, suggesting that the flux of acetyl-CoA (the acetyl donor) was diverted to alginate acetylation. |
| Starting Page | 715 |
| Ending Page | 723 |
| Page Count | 9 |
| File Format | |
| ISSN | 13675435 |
| Journal | Journal of Industrial Microbiology and Biotechnology |
| Volume Number | 40 |
| Issue Number | 7 |
| e-ISSN | 14765535 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2013-05-03 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | Subscribed |
| Subject Keyword | Azotobacter vinelandii Alginate acetylation Specific growth rate Dissolved oxygen tension Poly(3-hydroxybutyrate) Biochemistry Inorganic Chemistry Genetic Engineering Biotechnology Bioinformatics Microbiology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Medicine Bioengineering Applied Microbiology and Biotechnology Biotechnology |
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