Abstract
Polyhydroxyalkanoate (PHA) copolymers consisting of short-chain-length (SCL) and medium-chain-length (MCL) 3-hydroxyalkanoates (3HA) were produced by recombinant Ralstonia eutropha PHB −4 harboring a low-substrate-specificity PHA synthase PhaC2 Ps from Pseudomonas stutzeri 1317. These polyesters, containing a wide range of chain length, were purified and characterized by acetone fractionation, nuclear magnetic resonance (NMR), gel-permeation chromatography (GPC), differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and mechanical property studies. The physical properties of the copolymers are dependent largely with 3-hydroxyoctanoate (3HO) content in all PHA.
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