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| Content Provider | Springer Nature Link |
|---|---|
| Author | Zafar, Mohd. Kumar, Shashi Kumar, Surendra Dhiman, Amit K. |
| Copyright Year | 2012 |
| Abstract | The effects of agitation and aeration rates on copolymer poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [P(3HB-co-3HV)] production by Azohydromonas lata MTCC 2311 using cane molasses supplemented with propionic acid in a bioreactor were investigated. The experiments were conducted in a three-level factorial design by varying the impeller (150–500 rev min−1) and aeration (0.5–1.5 vvm) rates. Further, the data were fitted to mathematical models [quadratic polynomial equation and artificial neural network (ANN)] and process variables were optimized by genetic algorithm-coupled models. ANN and hybrid ANN-GA were found superior for modeling and optimization of process variables, respectively. The maximum copolymer concentration of 7.45 g l−1 with 21.50 mol% of 3HV was predicted at process variables: agitation speed, 287 rev min−1; and aeration rate, 0.85 vvm, which upon validation gave 7.20 g l−1 of P(3HB-co-3HV) with 21 mol% of 3HV with the prediction error (%) of 3.38 and 2.32, respectively. Agitation speed established a relative high importance of 72.19% than of aeration rate (27.80%) for copolymer accumulation. The volumetric gas–liquid mass transfer coefficient (k L a) was strongly affected by agitation and aeration rates. The highest P(3HB-co-3HV) productivity of 0.163 g l−1 h−1 was achieved at 0.17 s−1 of k L a value. During the early phase of copolymer production process, 3HB monomers were accumulated, which were shifted to 3HV units (9–21%) during the cultivation period of 24–42 h. The enhancement of 7.5 and 34% were reported for P(3HB-co-3HV) production and 3HV content, respectively, by hybrid ANN-GA paradigm, which revealed the significant utilization of cane molasses for improved copolymer production. |
| Starting Page | 987 |
| Ending Page | 1001 |
| Page Count | 15 |
| File Format | |
| ISSN | 13675435 |
| Journal | Journal of Industrial Microbiology and Biotechnology |
| Volume Number | 39 |
| Issue Number | 7 |
| e-ISSN | 14765535 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2012-02-24 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | Subscribed |
| Subject Keyword | Cane molasses P(3HB-co-3HV) Artificial neural network Genetic algorithm Volumetric oxygen transfer coefficient (k L a) Bioinformatics Biotechnology Genetic Engineering Biochemistry Microbiology Inorganic Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Medicine Bioengineering Applied Microbiology and Biotechnology Biotechnology |
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