Abstract
A method for the determination of polyphenols in olive in which the analytes are extracted into the aqueous phase by a liquid-liquid extraction system based on the use of a flow-injection configuration with iterative change of the flow direction is proposed. None of the typical units for this continuous separation technique are required by the proposed configuration. The analytes can be determined in the range over which polyphenols normally occur in these samples (100–900 μg ml −1) with better precision (2.8–4.0% vs. 6%) and sampling frequency (28 h −1 vs. 0.5 h −1) and sample (< 1 g vs. 30 g) and reagent consumption than by the conventional method.
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