Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1054, Issue 1-2, Pages 175-180Publisher
ELSEVIER
DOI: 10.1016/j.chroma.2004.07.092
Keywords
polyphenols; beers
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An analytical method based on solid-phase extraction (SPE) and followed by liquid chromatographic separation and ultraviolet detection (HPLC-UV) is proposed for the determination of 10 phenolic compounds which participate on beer stability and sensory properties in alcohol-free beers. Acetonitrile was found to be the most appropriate solvent for the elution of polyphenolic compounds adsorbed on C-18 cartridges. The performance of the method was assessed by the evaluation of parameters such as absolute recovery (generally higher than 60%), repeatability (lower than 10%), linearity (r(2) higher than 0.993) and limits of quantitation (ranging from I to 37 mug/L); no matrix effects were observed. The polyphenol content of different Spanish alcohol-free beers is presented. Five phenolic compounds such as protocatechuic, p-coumaric, ferulic, caffeic acids, and (+)-catechin were identified at levels lower than 10 mg/L. (C) 2004 Elsevier B.V. All rights reserved.
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