Abstract
This study aimed to enhance production of polyhydroxybutyrate P(3HB) by a newly engineered strain of Cupriavidus necator NSDG-GG by applying response surface methodology (RSM). From initial experiment of one-factor-at-a-time (OFAT), glucose and urea were found to be the most significant substrates as carbon and nitrogen sources, respectively, for the production of P(3HB). OFAT experiment results showed that the maximum biomass, P(3HB) content, and P(3HB) concentration of 8.95 g/L, 76 wt%, and 6.80 g/L were achieved at 25 g/L glucose and 0.54 g/L urea with an agitation rate of 200 rpm at 30 °C after 48 h. In this study, RSM was applied to optimize the three key variables (glucose concentration, urea concentration, and agitation speed) at a time to obtain optimal conditions in a multivariable system. Fermentation experiments were conducted in shaking flask by cultivation of C. necator NSDG-GG using various glucose concentrations (10–50 g/L), urea concentrations (0.27–0.73 g/L), and agitation speeds (150–250 rpm). The interaction between the variables studied was analyzed by ANOVA analysis. The RSM results indicated that the optimum cultivation conditions were 37.70 g/L glucose, 0.73 g/L urea, and 200 rpm agitation speed. The validation experiments under optimum conditions produced the highest biomass of 12.84 g/L, P(3HB) content of 92.16 wt%, and P(3HB) concentration of 11.83 g/L. RSM was found to be an efficient method in enhancing the production of biomass, P(3HB) content, and P(3HB) concentration by 43, 21, and 74%, respectively.
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Acknowledgements
This study was supported by Research University Grant (RUI) from Universiti Sains Malaysia (1001/PBIOLOGI/811328). Also, this study contributed to the international research project PHABIO APP – Polyhydroxyalkanoate Biopolymers from Animal Waste Fats for the Production of Value Added Biobased and Biodegradable Bioplastic Materials, founded by the Federal Ministry of Education and Research of Germany and supervised by the PTJ Jülich. Nazila Biglari expresses her in-depth gratitude towards Universiti Sains Malaysia for supporting her doctoral studies through USM Fellowship.
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NB certifies that she has participated full-time to make extensive contributions to conception and design, and acquisition of data, and analysis and interpretation of data for the entire content of the manuscript and writing the manuscript. MGD certifies that she has participated sufficiently in the work to take public responsibility for data analysis and writing the manuscript. PA certifies that she has participated sufficiently in the work to take public responsibility for discussion section and writing the manuscript. IO, TF give final approval of the version to be submitted and any revised version. KS certifies that he has participated in drafting the article or revising it critically for important intellectual content.
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Biglari, N., Ganjali Dashti, M., Abdeshahian, P. et al. Enhancement of bioplastic polyhydroxybutyrate P(3HB) production from glucose by newly engineered strain Cupriavidus necator NSDG-GG using response surface methodology. 3 Biotech 8, 330 (2018). https://doi.org/10.1007/s13205-018-1351-7
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DOI: https://doi.org/10.1007/s13205-018-1351-7