Fig. 3From: Metabolic engineering of Escherichia coli for direct production of vitamin C from D-glucoseUPLC–MS/MS SIM chromatogram analysis of vitamin C from strain B5703 (a) and B539 (b) at 8 h induction with arabinose; UPLC–MS/MS SIM chromatogram analysis of U–13C-vitamin C from strain B539 (c) at 8 h induction with arabinose (upper: M/Z175 or M/Z 181; middle: M/Z119 or M/Z 115; bottom: M/Z90 or M/Z 87)Back to article page