NMH (30 μL) was added to the oxidized cod liver oil solutions
described above, and the solutions were stirred for 1 h at room
temperature. Any 1-MP formed from the solutions was extracted using
a solid phase extraction (SPE) cartridge (MEGA BE-C18, 1 g, 6 mL,
Varian, USA). 2-Methylpyrazine (20 μL) was added to the extract as a
GC internal standard, and the volume of the extract was adjusted to
exactly 10 mL with ethyl acetate. The solution was analyzed for 1-MP
by an Agilent model 6890 GC equipped with a 30 m × 0.25 mm i.d.
(df = 0.25 μm) DB-WAX bounded-phase fused-silica capillary column
(Agilent, Folsom, CA), and an NPD was used for the analysis of 1-MP.
The linear velocity of the helium carrier gas was 30 cm/s at a splitless
mode. The injector and the detector temperatures were 250 °C. The
oven temperature was programmed from 60 to 140 at 4 °C/min.
NMH (30 μL) was added to the oxidized cod liver oil solutions
described above, and the solutions were stirred for 1 h at room
temperature. Any 1-MP formed from the solutions was extracted using
a solid phase extraction (SPE) cartridge (MEGA BE-C18, 1 g, 6 mL,
Varian, USA). 2-Methylpyrazine (20 μL) was added to the extract as a
GC internal standard, and the volume of the extract was adjusted to
exactly 10 mL with ethyl acetate. The solution was analyzed for 1-MP
by an Agilent model 6890 GC equipped with a 30 m × 0.25 mm i.d.
(df = 0.25 μm) DB-WAX bounded-phase fused-silica capillary column
(Agilent, Folsom, CA), and an NPD was used for the analysis of 1-MP.
The linear velocity of the helium carrier gas was 30 cm/s at a splitless
mode. The injector and the detector temperatures were 250 °C. The
oven temperature was programmed from 60 to 140 at 4 °C/min.
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