Polymers containing nitrophenyl groups were isolated when P. oleovorans was
grown with 5-(2',4'-dinitrophenyl)valerie acid (DNPVA). Growth experiments
were carried out containing variable ratios of this and nonanoic acid (NA)
. These revealed a loss of the 2'-nitro group as the experiment proceeded.
The bacteria produced polymeric materials with 1.2%-6.9% of repeating units
containing 4'-nitro and/or 2',4'-nitrophenyl rings, depending on the DNPVA
:NA molar ratio and total concentration of these carbon sources, according
to NMR analysis. The polymeric material isolated from approximately 15% dry
cell weight when using a 7:3 DNPVA:NA molar ratio at 10 mM total concentra
tion was a yellow, elastic substance. Thermal analysis indicated the presen
ce of two T-g values, T-g,T-1 = -35.95 degrees C and T-g,T-2 = 28.74 degree
s C, and one T-m value of 56.42 degrees C. These data suggest the presence
of two polymers, one which contains nitrophenyl rings and the other being t
he copolymer of nonanoic acid.