This build uses a practice called thin layer chromatography, which separates the components of a mixture by allowing them to travel at different rates across a thin adsorbent layer using a solvent.
Chemists at Washington University School of Medicine, St. Louis, have come up with a rapid immunoassay for caffeine that they plan to develop into a personal test kit (Anal. Chem. 2006, 78, 4501).
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