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Degradation of poly(3-hydroxybutyrate) by soil streptomycetes

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Abstract

The ability of 64 soil streptomycetes to degrade poly(3-hydroxybutyrate) [P(3HB)] was evaluated on Pridham and Lyons mineral salts agar medium overlayered with the same medium containing 0.2% P(3HB). The streptomycete isolates were grown on this overlayered medium and the degradation was detected by the formation of clear zone surrounding the growth. Four potent degrader isolates identified as species of Streptomyces were selected. Degradation of P(3HB) by these isolates was studied for a period of 8 days. The rate of degradation increased with increase in concentration of P(3HB) in the medium while it decreased with the supplementation of readily utili- zable carbon sources like glucose, fructose and sucrose. All four isolates also degraded the copolymer of 3-hydroxybutyrate and 3-hydroxyvalerate [P(3HB–co–3HV)] in solid medium but to a lesser extent. However, the isolates were equally efficient in degrading P(3HB) in liquid medium.

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Manna, A., Giri, P. & Paul, A. Degradation of poly(3-hydroxybutyrate) by soil streptomycetes. World Journal of Microbiology and Biotechnology 15, 705–709 (1999). https://doi.org/10.1023/A:1008980117018

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  • DOI: https://doi.org/10.1023/A:1008980117018

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