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Shake flask experiments showed that Pseudomonas oleovorans began to be growth inhibited at 4.65 g of sodium octanoate liter, with total inhibition at 6 g liter. In chemostat studies with 2 g of ammonium sulfate and 8 g of octanoate liter in the feed, the maximum specific growth rate was 0.51 h, and the maximum specific rate of poly-beta-hydroxyalkanoate (PHA) production was 0.074 g of PHA g of cellular protein h at a dilution rate (D) of 0.25 h. When the specific growth rate (mu) was &lt;0.3 h, the PHA composition was relatively constant with a C(4)/C(6)/C(8)/C(10) ratio of 0.1:1.7:20.7:1.0. At mu &gt; 0.3 h, a decrease in the percentage of C(8) with a concomitant increase in C(10) monomers as mu increased was probably due to the effects of higher concentrations of unmetabolized octanoate in the fermentor. At D = 0.24 h and an increasing carbon/nitrogen ratio, the percentage of PHA in the biomass was constant at 13% (wt/wt), indicating that nitrogen limitation did not affect PHA accumulation. Under carbon-limited conditions, the yield of biomass from substrate was 0.76 g of biomass g of octanoate consumed, the yield of PHA was 0.085 g of PHA g of octanoate used, and 7.9 g of octanoate was consumed for each gram of NH(4) supplied. The maintenance coefficient was 0.046 g of octanoate g of biomass h. Replacement of sodium octanoate with octanoic acid appeared to result in transport-limited growth due to the water insolubility of the acid.

Continuous Production of Long-Side-Chain Poly-β-Hydroxyalkanoates by Pseudomonas oleovorans