Determination of gallic acid with 4-nitrobenzenediazonium tetrafluoroborate by diffuse reflectance spectrometry on polyurethane foam Original Research Article

The present work describes a rapid and cost-effective analytical procedure for the determination of gallic acid. It is based on the solid-phase extraction of gallic acid in the form of the azo compound by polyurethane foam (PUF) and measurement by diffuse reflectance spectrometry. The calibration graphs are linear over the range 0.2–6 μg ml−1. The developed procedure was applied to the determination of gallic acid in alcoholic beverages.