title: In-Tube Extraction-GC-MS as a High-Capacity Enrichment Technique for the Analysis of Alcoholic Beverages.
abstract: An in-tube extraction (ITEX) method for the GC-MS analysis of volatile constituents of alcoholic beverages was developed and applied in the analysis of 46 beers from six varieties, Alt, Helles, Kölsch, Pilsener beer, Schwarzbier, and wheat beer, which are popular in Germany. The extraction performance of nine different sorbent materials was evaluated. The best overall sensitivity was achieved using Tenax TA, with method detection limits down to 0.01 μg L-1, whereas the widest linear range was possible with PDMS, covering almost 5 orders of magnitude. This is the first application of PDMS in ITEX as a high-capacity extraction device and highlights the importance of choosing the appropriate sorbent material for the analytical task at hand. A satisfying chemometric discrimination of all analyzed beer varieties was possible, and alcohol-free beers could clearly be separated from regular beers, also.
authors.affiliation: Instrumental Analytical Chemistry, University Duisburg-Essen , Universitätsstrasse 5, D-45141 Essen, Germany.
authors.forename: Jens
authors.initials: J
authors.lastname: Laaks
authors.affiliation: Instrumental Analytical Chemistry, University Duisburg-Essen , Universitätsstrasse 5, D-45141 Essen, Germany.
authors.forename: Maik A
authors.initials: MA
authors.lastname: Jochmann
authors.affiliation: BGB Analytik AG, Lettenstrasse 97, CH-8134 Adliswil, Switzerland.
authors.forename: Beat
authors.initials: B
authors.lastname: Schilling
authors.affiliation: Instrumental Analytical Chemistry, University Duisburg-Essen , Universitätsstrasse 5, D-45141 Essen, Germany.
authors.forename: Karl
authors.initials: K
authors.lastname: Molt
authors.affiliation: Instrumental Analytical Chemistry, University Duisburg-Essen , Universitätsstrasse 5, D-45141 Essen, Germany.
authors.forename: Torsten C
authors.initials: TC
authors.lastname: Schmidt
keywords: GC; ITEX; beer; in-tube extraction; microextraction