Y. Takagi et al., Biosynthesis of polyhydroxyalkanoate with a thiophenoxy side group obtained from Pseudomonas putida, MACROMOLEC, 32(25), 1999, pp. 8315-8318
Poly(3-hydroxyalkanoate) (PHA) with a thiophenoxy group at the end of the s
ide chain was obtained from Pseudomonas putida 27N01, using 11-thiophenoxy
undecanoic acid as the sole carbon source. NMR and GC/MS analyses indicated
that the polymer consisted of 3-hydroxy-5-thiophenoxypentanoate as the pri
mary monomer unit and 3-hydroxy-7-thiophenoxyheptanoate as a minor unit. Th
e polymer had a white cream color and was elastometric. X-ray analysis sugg
ested that the PHA had an amorphous-like diffraction pattern. The final dry
cell concentration was 693 mg/L, and the PHA content of the dry cells was
19.5%. GPC measurement with polystyrene as a standard showed that the numbe
r-average molecular weight was 81 000 with a polydispersity of 1.8. The gla
ss transition temperature was approximately 4 degrees C according to DSC. T
hus, we were able to successfully characterize this PHA and to show that a
sulfur atom can be incorporated into the bacterial polymer produced from P.
putida 27N01.