Abstract
Chromobacterium sp. isolated from a river soil produced blend of a copolyester consisting of 3-hydroxybutanoic acid (3HB) and 3-hydroxypropionic acid (3HP) units and copolyester consisting of the saturated 3hydroxyalkanoic acid (3HA) units of even carbon number C4 to C14 in addition to two unsaturated 3HA units [3hydroxy-5-cis-dodecenate (3H5DD) and 3-hydroxy-7-cis-tetradecenoate (3H7TD)] when cultivated on 1,3-propanediol (1,3-PD) as the sole carbon source under nitrogen-free conditions. The copolyesters with 3HP unit have up to 6 mol% 3HP fractions, the number average molecular weight (M n ) with up to 4.4 x 10 5 , the melting temperature (T m ) of 148158°C and the glass transition temperature (T g ) of 2-4°C. In cotrast, the medium-chain-length polyhydroxyalkanoates (PHA MCL ) with even carbon number of C6-C14 monomer units have ca. 60 mol% 3-hydroxydecanoate (3HD) fraction as the most predominant component and less than 4 mol% of 3H5DD and 3H7TD fractions as minor. The M n , T m and T g of PHA MCL were ca. 1.2 x 10 5 , 53°C and -45°C. respctively.
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