title: Optimisation of headspace solid-phase microextraction for analysis of aromatic compounds in vinegar.
abstract: Headspace solid-phase microextraction has been applied to the analysis of aroma compounds in vinegar. Silica fibre coated with Carboxen-polydimethylsiloxane was found to be more efficient at extracting these compounds than other fibres such as those coated with polydimethylsiloxane, Carbowax-divinylbenzene, and polydimethylsiloxane-divinylbenzene, but its repeatability was low. Different parameters such as extraction time, temperature of the sample during the extraction, ionic strength, and sample volume were optimised using a two-level factorial design expanded further to a central composite design. This chemometric tool is very appropriate in screening experiments where the aim is to investigate several possibly influential and/or interacting factors. The extraction efficiency is inversely affected by the acetic acid content-an increase in the acetic acid concentration decreases the extraction efficiency. No interference is observed with the increase in content of polyphenols.
authors.affiliation: Analytical Chemistry Department, Faculty of scinces, University of Cádiz, Rio San Pedro, Puerto Real, Spain. remedios.castro@uca.es
authors.forename: Remedios
authors.initials: R
authors.lastname: Castro Mejías
authors.forename: Ramón
authors.initials: R
authors.lastname: Natera Marín
authors.forename: M
authors.initials: M
authors.lastname: de Valme García Moreno
authors.forename: Carmelo
authors.initials: C
authors.lastname: García Barroso
mesh_terms: D019342:Acetic Acid / Q000737:chemistry*; D002849:Chromatography, Gas / Q000379:methods*; D005504:Food Analysis; D014835:Volatilization
chemical_list: D019342:Acetic Acid