Abstract
We investigated the biosynthesis and properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) produced by Haloferax mediterranei NBRC14739T from glucose. When H. mediterranei grew on 5 g/L glucose in flask culture, 43.7 wt% PHBV with 12 mol% 3-hydroxyvalerate (3HV) accumulated intracellularly. Size-exclusion chromatography revealed that this polymer had a weight-average molecular weight (Mw) and polydispersity (Mw/Mn) of 4.7 × 106 g/mol and 1.7, respectively. Increasing the glucose concentration in the flask cultures slightly promoted cell growth and increased the PHBV content but had less effect on molecular weight. Scale-up cultivation in a 5-L jar yielded 4.0 g/L PHBV from 20 g/L glucose with a Mw of up to 5.0 × 106 g/mol. These results showed that H. mediterranei can produce ultrahigh-molecular-weight (UHMW) PHBV from glucose. UHMW-PHBV (7 mol% 3HV, Mw = 4.4 × 106 g/mol) was used to prepare cold-drawn films, the mechanical properties of which were characterized. The films were produced by tenfold cold drawing, followed by annealing at 100 °C, and had a tensile strength and Young’s modulus of 258.7 MPa and 0.90 GPa, respectively.
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The authors greatly appreciate technical assistance from Ms. Hiroko Shinozaki.
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Ino, K., Sato, S., Ushimaru, K. et al. Mechanical properties of cold-drawn films of ultrahigh-molecular-weight poly(3-hydroxybutyrate-co-3-hydroxyvalerate) produced by Haloferax mediterranei. Polym J 52, 1299–1306 (2020). https://doi.org/10.1038/s41428-020-0379-9
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DOI: https://doi.org/10.1038/s41428-020-0379-9
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