|Articles|December 1, 2010

LCGC North America

  • LCGC North America-12-01-2010
  • Volume 28
  • Issue 12

Vol 28 No 12 LCGC North America December 2010 Regular Issue PDF

Click the title above to open the LCGC North America December 2010 regular issue, Vol 28 No 12, in an interactive PDF format.


Related to this article

Chromatography Detects Toxins in Tea Samples
High-performance liquid chromatography-tandem mass spectroscopy (HPLC–MS/MS) chromatography reveals pyrrolizidine alkaloids (PA)/pyrrolizidine alkaloid N-oxides (PANO) toxin risks in 63 tea samples.
Figure 2. Split injection used to measure triplicate test of MTBE, hexane, o-xylene, and 1-methylnaphthalene comparing different solvents (methanol, methylene chloride) and column insertion distances starting with 0.5 mm, 5.0 mm, 10.0 mm, 15 mm, and 20.0 mm. Methanol had the best performance at the 5.0 mm insertion distance and methylene chloride looked slightly better at the 0.5 mm. We would still recommend not going below the 5.0 mm manufacturer recommended insertion distance.
Revisiting insertion distance for methanol and methylene chloride in GC analysis and confirming that insertion depth strongly affects response and reproducibility.