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Analysis of erythromycin C produced by E. coli. (A and B) LC/MS-extracted ion chromatogram (m/z 720.5 ± 0.2) of the erythromycin C standard (A) and of an extract from a fermentation broth of E. coli K207/pBP130, pKOS207-129, pKOS452-53e, pKOS452-54, and pGro7 (B). (C and D) LC/MS of the erythromycin C standard (C) and of the peak corresponding to erythromycin C in the extract from a fermentation broth of E. coli K207/pBP130, pKOS207-129, pKOS452-53e, pKOS452-54, and pGro7 (D).
