Development and validation of an HPLC-method for determination of free and bound phenolic acids in cereals after solid-phase extraction.
Food Chem
; 134(3): 1624-32, 2012 Oct 01.
Article
em En
| MEDLINE
| ID: mdl-25005991
ABSTRACT
Whole cereal grains are a good source of phenolic acids associated with reduced risk of chronic diseases. This paper reports the development and validation of a high-performance liquid chromatography-diode array detection (HPLC-DAD) method for the determination of phenolic acids in cereals in either free or bound form. Extraction of free phenolic acids and clean-up was performed by an optimised solid-phase extraction (SPE) protocol on Oasis HLB cartridges using aqueous methanol as eluant. The mean recovery of analytes ranged between 84% and 106%. Bound phenolic acids were extracted using alkaline hydrolysis with mean recoveries of 80-95%, except for gallic acid, caffeic acid and protocatechuic acid. Both free and bound phenolic extracts were separated on a Nucleosil 100 C18 column, 5 µm (250 mm × 4.6 mm) thermostated at 30 °C, using a linear gradient elution system consisting of 1% (v/v) acetic acid in methanol. Method validation was performed by means of linearity, accuracy, intra-day and inter-day precision and sensitivity. Detection limits ranged between 0.13 and 0.18 µg/g. The method was applied to the analysis of free and bound phenolic acids contents in durum wheat, bread wheat, barley, oat, rice, rye, corn and triticale.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Grão Comestível
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Cromatografia Líquida de Alta Pressão
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Extração em Fase Sólida
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Hidroxibenzoatos
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article