Abstract
With the purpose of improving an analytical method for the determination of selected phenolic compounds in quince jams, a comparative study of recoveries by two different non-polar sorbents, Isolute C18 non end-capped (NEC) and Isolute C18 end-capped (EC), was performed. Significant differences in the recovery percentages were found. The results suggest that Isolute C18 (NEC) is the most suitable for the recovery of the selected phenolics from quince jams, when 1% of methanol was added to the samples. The reversed-phase High-Performance Liquid Chromatography/Diode Array Detector (HPLC/DAD) procedure is rapid, sensitive, reproducible, and accurate. The improved sample preparation was simple, involving only a C18 Solid-Phase Extraction (SPE) purification step. The detection limit values for phenolic compounds were between 0.1 and 1.6 μg mL−1 and the method was precise. As a general rule, the recovery values were high, except for arbutin. This technique can also be useful in the evaluation of commercial quince jams genuineness.
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