Samples were
analyzed using an Agilent 7000D GC-MS Triple Quad with an Agilent
7890B GC system; the instrument was equipped with an Agilent G4513A
injector and Agilent G4514A autosampler. One microliter of sample
was injected into a capillary column (HP-5MS UI, 30 m × 0.25
mm × 0.25 μm) in a splitless mode. Helium was used as the
carrier gas at a constant flow rate of 1.0 mL. min–1. The temperatures for the inlet, interface, and ion source were
set at 240, 270, and 270 °C, respectively. The temperatures for
MS Quad 1 and MS Quad 2 were set at 150 °C; the electron energy
for EI-Xtr350 was set at 70 eV, and the full scan was recorded at
35–650 m/z. The oven temperature was initiated
at 50 °C, held for 3 min, ramped at 5 °C min–1 to 180 °C, held for 2 min, ramped at 10 °C min–1 to 240 °C, held for 2 min, and then ramped down at 80 °C
min–1 to 50 °C. The instrument operation and
data acquisition were controlled by Mass Hunter software.
analyzed using an Agilent 7000D GC-MS Triple Quad with an Agilent
7890B GC system; the instrument was equipped with an Agilent G4513A
injector and Agilent G4514A autosampler. One microliter of sample
was injected into a capillary column (HP-5MS UI, 30 m × 0.25
mm × 0.25 μm) in a splitless mode. Helium was used as the
carrier gas at a constant flow rate of 1.0 mL. min–1. The temperatures for the inlet, interface, and ion source were
set at 240, 270, and 270 °C, respectively. The temperatures for
MS Quad 1 and MS Quad 2 were set at 150 °C; the electron energy
for EI-Xtr350 was set at 70 eV, and the full scan was recorded at
35–650 m/z. The oven temperature was initiated
at 50 °C, held for 3 min, ramped at 5 °C min–1 to 180 °C, held for 2 min, ramped at 10 °C min–1 to 240 °C, held for 2 min, and then ramped down at 80 °C
min–1 to 50 °C. The instrument operation and
data acquisition were controlled by Mass Hunter software.