Abstract
The aim of this work was to statistically optimize the cultural and nutritional parameters for the production of polyhydroxybutyrate (PHB) under submerged fermentation using jackfruit seed hydrolysate as the sole carbon source. On the basis of results obtained from “one variable at a time” experiment, inoculum age, jackfruit seed hydrolysate concentration, and pH were selected for response surface methodology studies. A central composite design (CCD) was employed to get the optimum level of these three factors to maximize the PHB production. The CCD results predicted that jackfruit seed hydrolysates containing 2.5% reducing sugar, inoculum age of 18 h, and initial medium pH 6 could enhance the production of PHB to reach 49% of the biomass (biomass 4.5 g/l and PHB concentration 2.2 g/l). Analysis of variance exhibited a high coefficient of determination (R 2) value of 0.910 and 0.928 for biomass and PHB concentration, respectively, and ensured that the quadratic model with the experimental data was a satisfactory one. This is the first report on PHB production by Bacillus sphaericus using statistical experimental design and RSM in submerged fermentation with jackfruit seed hydrolysate as the sole source of carbon.
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Abbreviations
- PHB:
-
Polyhydroxybutyrate
- SmF:
-
Submerged fermentation
- CCD:
-
Central composite design
- RSM:
-
Response surface methodology
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One of the authors (NVR) would like to acknowledge the financial assistance from the Council of Scientific and Industrial Research (CSIR), New Delhi, India by awarding Senior Research Fellowship during the course of this investigation.
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Ramadas, N.V., Soccol, C.R. & Pandey, A. A Statistical Approach for Optimization of Polyhydroxybutyrate Production by Bacillus sphaericus NCIM 5149 under Submerged Fermentation Using Central Composite Design. Appl Biochem Biotechnol 162, 996–1007 (2010). https://doi.org/10.1007/s12010-009-8807-5
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DOI: https://doi.org/10.1007/s12010-009-8807-5