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Journal of Polymers and the Environment

, Volume 27, Issue 1, pp 198–209 | Cite as

The Use of Azohydromonas lata DSM 1122 to Produce 4-hydroxyvalerate-Containing Polyhydroxyalkanoate Terpolymers, and Unique Polymer Blends from Mixed-Cultures with Burkholderia sacchari DSM 17165

  • Richard D. AshbyEmail author
  • Daniel K. Y. Solaiman
  • Gary D. Strahan
Original Paper
  • 41 Downloads

Abstract

Azohydromonas lata DSM 1122 was utilized to synthesize short-chain-length (scl-) polyhydroxyalkanoate (PHA) terpolymers containing 3-hydroxybutyric (3HB) acid, 3-hydroxyvaleric (3HV) acid, and 4-hydroxyvaleric (4HV) acid from mixtures of glucose (GLC; 1 wt%) and levulinic acid (LevA; 0–0.4 wt%). LevA media concentrations greater than 0.4% completely inhibited cellular growth. At LevA concentrations ≤ 0.4%, the 3HV polymer content remained constant (3–5 mol%). The 4HV content was two-fold higher in the polymers derived from the 0.2% LevA-containing cultures reaching a maximum of 9 mol% (vs. 4 mol% in the 0.4% LevA-containing cultures). Polymer molecular weights (based on number-average molecular weight, Mn) were smallest (Mn = 240,000 g/mol) when synthesized in the presence of 0.2% LevA. At 0.4% LevA and at 1% GLC the average Mn values were 43% and 87% larger than the polymers synthesized in the presence of 0.2% LevA, respectively. Mixed-cultures containing A. lata and Burkholderia sacchari DSM 17165, a known poly-3-hydroxybutyrate-block-3-hydroxyvalerate (P3HB-block-3HV) producer, using LevA media concentrations ≤ 0.4% and staggered inoculations resulted in scl-PHA polymer mixtures with improved tensile properties. The results of this study show that LevA can be utilized in combination with simple sugars to produce unique scl-PHA terpolyesters and scl-PHA mixtures with enhanced properties.

Keywords

Azohydromonas lata Levulinic acid Terpolyesters 4-Hydroxyvalerate Mixed cultures 

Notes

Acknowledgements

The authors gratefully acknowledge Nicole Crocker, Jennifer Thomas, and Nick Latona for their technical assistance throughout the study.

Disclaimer

Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the U.S. Department of Agriculture (USDA). USDA is an equal opportunity provider and employer.

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Copyright information

© This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 2018

Authors and Affiliations

  1. 1.Eastern Regional Research Center, Agricultural Research Service, U. S. Department of AgricultureWyndmoorUSA

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