Optimization of headspace solid-phase microextraction for analysis of winearoma compounds

Headspace solid-phase microextraction (SPME) is a fast and simple sampling method for analysis of volatile compounds, but quantitation can be affected by sample matrix and sampling conditions. Sampling time and temperature ar e particularly important in controlling analyte response, and the effects v ary for different compound classes and volatilities. Tests with model solut ions containing a range of typical wine volatiles show that increasing temp erature and sampling time can increase sensitivity for higher boiling polar compounds but decrease sensitivity for very volatile compounds. Sample mat rix elements such as ethanol concentration can also have different effects on the responses of different compounds.