Abstract
Two years ago, room-temperature ionic liquids became the first new type of commercial stationary phase to hit gas chromatography in more than three decades. Scientists have known about ionic liquids for more than a century, but their usefulness for GC wasn’t proven until 2005. The first commercial ionic liquid stationary phases were introduced by Supelco, a division of Sigma-Aldrich, in 2010. In a Pittcon symposium, separation scientists described the use of ionic liquids as GC stationary phases and as matrices for matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS). Ionic liquids are salts that are liquid at room temperature. They generally consist of a bulky organic cation, such as 1-butyl-3-methylimidazolium, paired with an anion, which can range from simple halides to bulky compounds such as triflate. Several characteristics of room-temperature ionic liquids make them particularly attractive as GC stationary phases, said Daniel W. Armstrong, a professor of chemistry and biochemist...
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