title: Stir bar sorptive extraction of volatile compounds in vinegar: validation study and comparison with solid phase microextraction.
abstract: Stir bar sorptive extraction was evaluated for analysing volatiles in vinegar. The procedure developed shows detection and quantitation limits, and linear ranges adequate for analysing this type of compounds. The accuracy obtained was close to 100%, with repeatability values lower than 13%. The extraction efficiency is inversely affected by the acetic acid content. Although the absolute areas decrease, the compound area/internal standard area ratio remains constant, so for quantitative analysis, the acetic acid concentration does not affect the analytical data. The method was compared with a previous SPME method. Similar performance characteristics were obtained for both methodologies, with lower detection and quantitation limits and better repeatability reproducibility values for SBSE. Both analytical methods were used to analyse a variety of vinegars. The results obtained from both methods were in agreement.
authors.affiliation: Analytical Chemistry Department, Faculty of Sciences, University of Cádiz, P.O. Box 40, E-11510 Pol. Río San Pedro, Puerto Real, Cádiz, Spain.
authors.forename: Enrique Durán
authors.initials: ED
authors.lastname: Guerrero
authors.forename: Ramón Natera
authors.initials: RN
authors.lastname: Marín
authors.forename: Remedios Castro
authors.initials: RC
authors.lastname: Mejías
authors.forename: Carmelo García
authors.initials: CG
authors.lastname: Barroso
mesh_terms: D019342:Acetic Acid / Q000032:analysis* / Q000737:chemistry; D000327:Adsorption; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D005506:Food Contamination / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry / Q000295:instrumentation* / Q000379:methods*; D000439:Pentanols / Q000592:standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D052617:Solid Phase Microextraction / Q000379:methods / Q000592:standards*; D014835:Volatilization