Abstract
In this study, polyhydroxyalkanoates (PHA) accumulation by Halomonas venusta KT832796, a moderate halophilic bacteria isolated from marine source was studied. Both nutritional requirements and process parameters for submerged cultivation of the organism in bioreactor have been standardized. From the shake flask studies, glucose and ammonium citrate as carbon and nitrogen source produced maximum PHA at a ratio 20 with 3.52 g/L of dry cell weight and 70.56% of PHA content. However, ammonium sulfate as the nitrogen source was found to be more suitable for fed-batch cultivation. Several feeding strategies including pH-based fed-batch and variants of pulse feeding were studied to improve the PHA levels. pH-based feeding, although improved PHA level to 26 g/L, most of the carbon flux was diverted towards biomass formation; hence, the percent PHA was only 39.15% of the dry cell weight. Maximum PHA of 33.4 g/L, which corresponded to 88.12% of the dry cell, was obtained from high concentration single pulse method. There was a net 8.65-fold increase in PHA using this feeding strategy when compared to batch studies. According to our knowledge, this is the highest amount of PHA reported for a Halomonas venusta strain.
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The authors would like to express their gratitude to the Director, CSIR-CFTRI for providing facilities to carry out the research work. Ms. Angelina would like to thank the funding agency of UGC-Maulana Azad National Fellowship for financially supporting the research work.
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Stanley, A., Punil Kumar, H.N., Mutturi, S. et al. Fed-Batch Strategies for Production of PHA Using a Native Isolate of Halomonas venusta KT832796 Strain. Appl Biochem Biotechnol 184, 935–952 (2018). https://doi.org/10.1007/s12010-017-2601-6
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DOI: https://doi.org/10.1007/s12010-017-2601-6