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자료유형
학술저널
저자정보
저널정보
한국미생물생명공학회 Journal of Microbiology and Biotechnology Journal of Microbiology and Biotechnology 제15권 제6호
발행연도
2005.1
수록면
1,330 - 1,336 (7page)

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Polyhydroxyalkanoic acid (PHA) inclusion bodieswere analyzed in situ by 13C-nuclear magnetic resonance(13C-NMR) spectroscopy. The PHA inclusion bodies studiedwere composed of poly(3-hydroxybutyrate) or poly(3-hydroxybutyrate-co-4-hydroxybutyrate), which was accumulatedin Hydrogenophaga pseudoflava, and medium-chain-lengthPHA (MCL-PHA), which was accumulated in Pseudomonasfluorescens BM07 from octanoic acid or 11-phenoxyundecanoicacid (11-POU). The quantification of the 13C-NMR signals wasconducted against a standard compound, sodium 2,2-dimethyl-2-silapentane-5-sulfonate (DSS). The chemical shift valuesfor the in vivo NMR spectral peaks agreed well with those forthe corresponding purified PHA polymers. The intracellulardegradation of the PHA inclusions by intracellular PHAdepolymerase(s) was monitored by in vivo NMR spectroscopyand analyzed in terms of first-order reaction kinetics. The H.pseudoflava cells were washed for the degradation experiment,transferred to a degradation medium without a carbon source,but containing 1.0 g/l ammonium sulfate, and cultivated at35oC for 72 h. The in vivo NMR spectra were obtained at70oC for the short-chain-length PHA cells whereas the spectrafor the aliphatic and aromatic MCL-PHA cells were obtainedat 50oC and 80oC, respectively. For the H. pseudoflava cells,the in vivo NMR kinetics analysis of the PHA degradationresulted in a first-order degradation rate constant of 0.075/h(r2=0.94) for the initial 24 h of degradation, which was closeto the 0.050/h determined when using a gas chromatographicanalysis of chloroform extracts of sulfuric acid/methanol reactionmixtures of dried whole cells. Accordingly, it is suggestedthat in vivo 13C-NMR spectroscopy is an important tool forstudying intracellular PHA degradation in terms of kinetics.

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