Which chromatography system is commonly used in conjunction with mass spectrometry?

Which chromatography system is commonly used in conjunction with mass spectrometry?

• A. High-performance liquid
• B. Ion-exchange
• C. Partition
• D. Gas-liquid

Answer: (D)

Gas-liquid chromatography is routinely paired with mass spectrometry because it efficiently separates volatile and thermally stable compounds, which can then be identified and quantified by the MS detector. In this setup, a volatile sample is carried by an inert gas through a column whose stationary phase is liquid. Different compounds partition between the gas and the liquid at different rates, giving a clean separation as they elute. When each compound exits the column, it enters the mass spectrometer where its mass spectrum provides precise molecular information and fragmentation patterns. This GC-MS combination is a staple for analyzing drugs, pesticides, environmental volatiles, and other small organic molecules. While liquid chromatography also pairs with MS in many contexts, the classic and most common pairing for the scenario described is gas-liquid chromatography.

Gas-liquid chromatography is routinely paired with mass spectrometry because it efficiently separates volatile and thermally stable compounds, which can then be identified and quantified by the MS detector. In this setup, a volatile sample is carried by an inert gas through a column whose stationary phase is liquid. Different compounds partition between the gas and the liquid at different rates, giving a clean separation as they elute. When each compound exits the column, it enters the mass spectrometer where its mass spectrum provides precise molecular information and fragmentation patterns. This GC-MS combination is a staple for analyzing drugs, pesticides, environmental volatiles, and other small organic molecules. While liquid chromatography also pairs with MS in many contexts, the classic and most common pairing for the scenario described is gas-liquid chromatography.