What is the process to extract the resveratrol?
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A simple method for the quantitative extraction of resveratrol and its glycosides from grape berry skins has been developed. Optimal conditions for the extraction were investigated. Type of solvent, time, and temperature assayed influenced resveratrol and piceid yield. Adequate extraction was attained with ethanol/water (80:20 v/v) maintained at 60 °C for 30 min. Recovery (>96%) and reproducibility (6.83−15.13%) were satisfactory. After extraction, resveratrol and piceid isomers were quantified by high-performance liquid chromatography coupled to a ultraviolet−visible diode array detector.
http://blog.itechtalk.com/2009/resveratrol-extract/