Comparison of Amberlite XAD-2/Freon 11 extraction with liquid liquid extraction for the determination of wine flavor components

An extraction method using Amberlite XAD-2 sorbent with Freon 11 to extract wine volatiles was evaluated and compared with Freon 11 liquid/liquid extraction. The experiments were performed on a synthetic model solution containing 40 typical wine volatiles. Relative recoveries by XAD-2 extraction were measured and compared with those of liquid/liquid extraction. Results indicated that XAD-2 extraction using Freon 11 as the eluent is comparable to liquid/liquid extraction for most volatiles of interest in wine. Both sample preparation methods exhibit a high relative recovery for longer chain alcohols, esters, aldehydes, ketones, and monoterpenes. However, they show a low extraction efficiency for low molecular weight alcohols and organic acids. This was further confirmed by comparing differences in the measured concentrations of volatiles in a Riesling wine.