Abstract
Two-stage fermentation was normally employed to achieve a high poly(3-hydroxybutyrate-co-4-hydroxybutyrate) [P(3HB-co-4HB)] productivity with higher 4HB molar fraction. Here, we demonstrated single-stage fermentation method which is more industrial feasible by implementing mixed-substrate cultivation strategy. Studies on bioreactor scale show a remarkably high PHA accumulation of 73 wt%, contributing to a high PHA concentration and product yield of 8.6 g/L and 2.7 g/g, respectively. This fermentation strategy has resulted in copolymers with wider range of 4HB monomer composition, which ranges from 12 to 55 mol%. These copolymers show a broad range of weight average molecular weight (M w ) from 119.5 to 407.0 kDa. The copolymer characteristics were found to be predominantly affected by the nature of the substrates and the mixture strategies, regardless of the 4HB monomer compositions. This was supported by the determination of copolymer randomness using 13C-NMR analysis. The study warrants significantly in the copolymer scale-up and modeling at industrial level.
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Acknowledgments
The authors acknowledge the research grants provided by Ministry of Science, Technology and Innovation (02-05-23-SF0003) and also Malaysia Toray Science Foundation (MTSF) that has resulted in this article. We are also grateful to Mr. Leonard Lu Tze Jian for his help in language editing.
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Huong, KH., Kannusamy, S., Lim, S.Y.H. et al. Biosynthetic enhancement of single-stage Poly(3-hydroxybutyrate-co-4-hydroxybutyrate) production by manipulating the substrate mixtures. J Ind Microbiol Biotechnol 42, 1291–1297 (2015). https://doi.org/10.1007/s10295-015-1657-y
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DOI: https://doi.org/10.1007/s10295-015-1657-y