Derivatives ofintracellularmetabolites were analyzed by GC/MS
with a Bruker 450-GC instrument coupled to a Bruker 300-
MS single quadruple mass spectrometer (Bruker Inc., Fremont,
USA). A 1-L sample aliquot was injected onto a VF-5 ms column
(30 m × 250 m internal diameter, 0.25 m film thickness)
in splitless mode. Helium gas flow rate, as a carrier gas, was
set at 1.5 mL/min. The GC column temperature gradient was set
at 70 ◦C for 1 min, increased by 2 ◦C/min to 80 ◦C and held for
1 min, increased by 6 ◦C/min to 200 ◦C and held for 3 min, and then
increased by 15 ◦C/min to 320 ◦C and held for 5 min. The temperature
of the transfer line to mass spectrometer was set to 280 ◦C
and that of the ion source was set to 220 ◦C. The EI energy was set
to 70 eV. Scan (m/z: 50–800) and selected ion monitoring modes
were used for qualitative measurements and isotope monitoring,
respectively.
Derivatives ofintracellularmetabolites were analyzed by GC/MSwith a Bruker 450-GC instrument coupled to a Bruker 300-MS single quadruple mass spectrometer (Bruker Inc., Fremont,USA). A 1-L sample aliquot was injected onto a VF-5 ms column(30 m × 250 m internal diameter, 0.25 m film thickness)in splitless mode. Helium gas flow rate, as a carrier gas, wasset at 1.5 mL/min. The GC column temperature gradient was setat 70 ◦C for 1 min, increased by 2 ◦C/min to 80 ◦C and held for1 min, increased by 6 ◦C/min to 200 ◦C and held for 3 min, and thenincreased by 15 ◦C/min to 320 ◦C and held for 5 min. The temperatureof the transfer line to mass spectrometer was set to 280 ◦Cand that of the ion source was set to 220 ◦C. The EI energy was setto 70 eV. Scan (m/z: 50–800) and selected ion monitoring modeswere used for qualitative measurements and isotope monitoring,respectively.
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