Simultaneous analysis of riboflavin and aromatic amino acids in beer using fluorescence and multivariate calibration methods

Anal Chim Acta. 2008 Apr 21;613(2):207-17. doi: 10.1016/j.aca.2008.02.063. Epub 2008 Mar 6.

Abstract

The study demonstrates an application of the front-face fluorescence spectroscopy combined with multivariate regression methods to the analysis of fluorescent beer components. Partial least-squares regressions (PLS1, PLS2, and N-way PLS) were utilized to develop calibration models between synchronous fluorescence spectra and excitation-emission matrices of beers, on one hand, and analytical concentrations of riboflavin and aromatic amino acids, on the other hand. The best results were obtained in the analysis of excitation-emission matrices using the N-way PLS2 method. The respective correlation coefficients, and the values of the root mean-square error of cross-validation (RMSECV), expressed as percentages of the respective mean analytic concentrations, were: 0.963 and 14% for riboflavin, 0.974 and 4% for tryptophan, 0.980 and 4% for tyrosine, and 0.982 and 19% for phenylalanine.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acids, Aromatic / analysis*
  • Beer / analysis*
  • Calibration
  • Chromatography, High Pressure Liquid
  • Multivariate Analysis
  • Riboflavin / analysis*
  • Spectrometry, Fluorescence / methods*

Substances

  • Amino Acids, Aromatic
  • Riboflavin