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Determination of caffeine in solid pharmaceutical samples by FTIR spectroscopy
Authors:Montserrat Baucells  Núria Ferrer  Pilar Gómez  Gloria Lacort  Montserrat Roura
Institution:(1) Serveis Cientifico Tècnics, Universitat Barcelona, Lluís Solé i Sabarís, 1, E-08028 Barcelona, Spain
Abstract:Fourier transform infrared spectroscopy has been used for the quantitative determination of caffeine in several pharmaceutical products: acetyl salicylic acid, paracetamol and propyphenazone. The method is simple, rapid and selective, and allows the determination of caffeine without sample pretreatment and without separation from the matrix. Two techniques for measuring the infrared spectra of caffeine are described: transmission through pellets and diffuse reflectance from powder (DRIFT). In both methods, samples were diluted (1%) with KBr. Caffeine in pharmaceutical matrices was recovered within 5% error in pellets and 10% by DRIFT. Relative standard deviations were generally les1.5% for repeated measurements on a single pellet and les 5% for measurements on different pellets. DRIFT in the vacuum mode gave rather large RSDs. The limit of detection of the pellet technique was about 0.5% caffeine in the original sample.
Keywords:caffeine  FTIR  DRIFT  transmission measurements  acetylsalicylic acid  paracetamol  propyphenazone
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