A rapid FTIR spectroscopic method for estimation of caffeine in soft drinks and total methylxanthines in tea and coffee

M. M. Paradkar, J. Irudayaraj

Research output: Contribution to journalArticlepeer-review

Abstract

A rapid Fourier Transform infrared (FTIR) spectroscopic method was developed to estimate caffeine in a variety of soft drinks and total methylxanthine content in tea and coffee using a single calibration model. FTIR spectrum of pure caffeine was characterized, and the 2 spectral regions of 1500 to 1800 cm-1 and 2800 to 3000 cm-1 were used for quantitative estimation using Partial least square (PLS) and principal component regression (PCR). FTIR spectroscopy with chemometrics using the PLS-First derivative spectra could predict the caffeine content accurately up to an R2 value greater than 0.99 and a standard error of prediction (SEP) of less than 3.2 with 5 factors in the model.

Original languageEnglish (US)
Pages (from-to)2507-2511
Number of pages5
JournalJournal of food science
Volume67
Issue number7
DOIs
StatePublished - Sep 2002
Externally publishedYes

Keywords

  • Caffeine
  • Carbonated beverages
  • Chemometrics
  • Coffee
  • FTIR spectroscopy
  • Tea

ASJC Scopus subject areas

  • Food Science

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