The solvent composition was found to have a significant effect on the recovery (p < 0.005) for both of the functional foods studied. The optimal UAE conditions were 90% methanol in water, an extraction time of 10 min, an ultrasonic probe with a diameter of 7 mm, and solvent-to-solid ratios of 40:1 and 10:1, respectively, for cookies and jams.
The methods developed in this study show a high precision in terms of Coefficient of Variance (CV), with values of less than 5% for both repeatability and intermediate precision. The applicability of the methods to real samples has been evaluated and it was confirmed that the methods are suitable for the extraction of resveratrol from cookies and jams.
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