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(A) Chemical structure of ethanol-capped P(3HB). (B) Whole and enlarged 125-MHz 13C NMR spectra of low-molecular-weight P(3HB) synthesized by E. coli JM109 harboring pGEM-phaRCYB-4AB (Mn = 20 × 103; Mw/Mn = 2.1) cultured for 72 h at 37°C. (C) Whole and enlarged 500-MHz 1H NMR spectra of the low-molecular-weight P(3HB). i*, the methylene resonance for alcohols longer than ethanol. The values in parentheses show the intensity ratio of each peak.
