Abstract
The high production cost of bio-based plastic polyhydroxyalkanoates (PHAs) limits their use as commercial products. Thus, systems for PHAs production from waste substrates could reduce production costs. Crude glycerol is a by-product of biodiesel fuel production and thus represents an inexpensive, abundant and promising carbon source for production of valorized fermentation products. In this study, industrial crude glycerol by-product from palm oil biodiesel production was used as the carbon source for production of PHAs by recombinant Escherichia coli. Crude glycerol supplemented at 1–5 % (v/v) supported production of poly(3-hydroxybutyrate) (P(3HB)) in E. coli-ABC Ah , which harbors the PHA synthetic genes for β-ketothiolase (PhaA Re ), acetoacetyl-CoA reductase (PhaB Re ) of Ralstonia eutropha and Polyhydroxyalkanoate (PHA) synthase (PhaC Ah ) of Aeromonas hydrophila. The highest P(3HB) content and productivity of 14 wt% of cell dry weight and 0.6 g/L, respectively, were obtained at 1 % (v/v) glycerol concentration. Production of P(3HB-co-3-hydroxyhexanoate) (P(3HB-co-3HHx)) was achieved using E. coli-ABC Ah J Ah , harboring genes for PhaA Re , PhaB Re , PhaC Ah , and the (R)-specific enoyl-CoA hydratase (PhaJ Ah ) of A. hydrophila. This led to the copolymer content of 3 wt% of cell dry weight with 1 mol% of 3HHx. Molecular weight and degradation temperature of the polymers were in the range of 110–130 kDa and 295–299 °C, respectively. These results indicated that crude glycerol could be an attractive carbon source for economical production of PHAs with properties for industrial application.
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Acknowledgments
We would like to thank Dr. Isao Noda for kindly providing standard P(3HB-co-3HHx) (Nodax™). Manuscript proofreading by Dr. Philip Shaw is appreciated. This work was supported by the Royal Golden Jubilee Ph.D. Program Scholarship Program (PHD/0268/2549), Mahidol University and a research grant from the National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Thailand.
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Phithakrotchanakoon, C., Champreda, V., Aiba, Si. et al. Production of Polyhydroxyalkanoates from Crude Glycerol Using Recombinant Escherichia coli . J Polym Environ 23, 38–44 (2015). https://doi.org/10.1007/s10924-014-0681-8
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DOI: https://doi.org/10.1007/s10924-014-0681-8