Fast chromatographic determination of caffeine in food using a capillary hexyl methacrylate monolithic column

► Validation of a simple and rapid method for caffeine determination in food. ► Caffeine determination on monolithic column is faster, cheaper and more sensitive. ► Greater temperature influence on caffeine extraction from tea than coffee and cocoa. ► Capillary monolithic columns are simple to prepare and fritless with a higher permeability.