Determination of aldehydes as pentafluorobenzyl derivatives in grape pomace distillates by HS-SPME-GC/MS

► The method showed a linear response range up to 400 μg/L for alkenals and alkadienals. ► Excellent repeatability (RSD < 10%). ► Relative recoveries ranged from 80% to 110%. ► SPME-GC-MS method provides LOQs below the sensorial threshold of target aldehydes. ► The demetilant column decreases aliphatic aldehydes but increases alkenals, hexenal and alkadienals.