To confirm the conversion of HMF to HMF alcohol, aliquots taken from the fermentation medium were analyzed by an Agilent 1200 HPLC system (Waldbronn, Germany), consisting of a binary pump, autosampler and temperature controlled column oven, coupled to an Agilent 6130 MS detector, equipped with an electrospray ionization (ESI) interface. The LC-MS system was operated in positive ionization mode using the following interface parameters: Drying gas (N2) flow rate of 13 mL/min, nebulizer pressure of 40 psig, drying gas temperature of 350 °C, capillary voltage of 4 kV, and fragmentor voltage of 100 eV. The chromatographic separationswere performed on an Atlantis dC18 column (4.6 × 250 mm, 5 μm), using the isocratic mixture of 100 mM aqueous formic acid solution and acetonitrile (90:10, v/v) at a flow rate of 1.0 mL/min at 40 °C. Mass spectrum was recorded (m/z range 50–300) to determine furfural derivatives and their potential
conversion products. Parent and compound specific ions of 127 and 109 for HMF, and of 129 and 111 for HMF alcohol were also monitored in selected ion monitoring mode.
To confirm the conversion of HMF to HMF alcohol, aliquots taken from the fermentation medium were analyzed by an Agilent 1200 HPLC system (Waldbronn, Germany), consisting of a binary pump, autosampler and temperature controlled column oven, coupled to an Agilent 6130 MS detector, equipped with an electrospray ionization (ESI) interface. The LC-MS system was operated in positive ionization mode using the following interface parameters: Drying gas (N2) flow rate of 13 mL/min, nebulizer pressure of 40 psig, drying gas temperature of 350 °C, capillary voltage of 4 kV, and fragmentor voltage of 100 eV. The chromatographic separationswere performed on an Atlantis dC18 column (4.6 × 250 mm, 5 μm), using the isocratic mixture of 100 mM aqueous formic acid solution and acetonitrile (90:10, v/v) at a flow rate of 1.0 mL/min at 40 °C. Mass spectrum was recorded (m/z range 50–300) to determine furfural derivatives and their potential
conversion products. Parent and compound specific ions of 127 and 109 for HMF, and of 129 and 111 for HMF alcohol were also monitored in selected ion monitoring mode.
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