Journal
EUROPEAN FOOD RESEARCH AND TECHNOLOGY
Volume 216, Issue 6, Pages 544-548Publisher
SPRINGER-VERLAG
DOI: 10.1007/s00217-003-0677-4
Keywords
authenticity; caffeine; coffee; guarana; isotope ratio mass spectrometry (IRMS); mate; stable isotope analysis; tea
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The delta(13) C-VPDB and delta(18)O(VSMOW) values of caffeine isolated from commercial caffeine-containing foods were determined by isotope ratio mass spectrometry (IRMS) using elemental analysis (EA) in the 'combustion' (C) and 'pyrolysis' (P) modes (EA-C/P-IRMS), respectively. In total, 69 samples (32 guarana products, 20 teas, 12 coffee products, and 5 mate teas) were analyzed together with three references of synthetic caffeine. Validation was done by excluding isotope discrimination in the course of sample preparation and determining linear dynamic ranges for EA-P-IRMS measurements. In total, five samples (one caffeine-containing soft drink and four guarana products) under study contained synthetic caffeine.
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