Abstract
A fed-batch process was developed, which allowed biotechnological production of the homopolyester poly(3-hydroxyvaleric acid) [poly(3HV)], in a mineral salts medium containing valeric acid as carbon source and complex nutrients as supplements byChromobacterium violaceum at a 10- and 300-L fermentation scale. This process yielded up to 40 g dry cell matter per L fermentation broth, and the cells contained up to 70% (w/w) poly(3HV). Poly(3HV), which was extracted from the cells with chloroform and was precipitated from this solvent with ethanol, was processed to test bars by injection molding or by press processing and to fibers by melt spinning. The unprocessed and processed poly(3HV) material was characterized with respect to the molecular weight and with respect to thermal, rheological, and mechanical properties. It was shown that it is possible to process biodegradable poly(3HV) thermoplastically and to obtain a polymer suitable for applications with low strength requirements.
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Steinbüchel, A., Schmack, G. Large-scale production of poly(3-hydroxyvaleric acid) by fermentation ofChromobacterium violaceum, processing, and characterization of the homopolyester. J Environ Polym Degr 3, 243–258 (1995). https://doi.org/10.1007/BF02068679
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DOI: https://doi.org/10.1007/BF02068679