title: Fish quality assessment with ion mobility based gas detector.
abstract: Measurement of the mixture of extractable volatile compounds of the gills of vendace was used in the fish freshness evaluation (Coregonus albula L.). MGD-1 gas detector was used for the detection of volatile compound profiles of hexane extracts of gills. The measuring principle of MGD-1 is ion mobility distribution and is based on IMCELL technique. A 2.5 microl sample of hexane extract was heated on a ceramic plate and the vapour was carried with a constant flow (2.5 I/min) of active carbon filtered air to the detector. The ion mobility distribution spectrum was measured every 1 second for 2 minutes. For reference, the microbial counts of gills, ATP-breakdown products (K-value) of fish flesh, electrical properties (Torrymeter scores) of fish skin and sensory evaluation scores were measured. The ion mobility distribution profiles of gills changed significantly during the 7 days storage period The findings related to freshness evaluation were supported by the reference methods. There is, however, a seasonal difference in the freshness probably due to seasonal variation of microbial flora. Besides the evaluation of fish quality, ion mobility distribution based technique provides a new analytical tool for food quality assessment.
authors.affiliation: Food and Health Research Centre, University of Kuopio, Box 1627, FIN-70211 Kuopio, Finland.
authors.forename: O
authors.initials: O
authors.lastname: Raatikainen
authors.forename: J
authors.initials: J
authors.lastname: Pursiainen
authors.forename: P
authors.initials: P
authors.lastname: Hyvönen
authors.forename: A
authors.initials: A
authors.lastname: von Wright
authors.forename: S P
authors.initials: SP
authors.lastname: Reinikainen
authors.forename: P
authors.initials: P
authors.lastname: Muje
mesh_terms: D000818:Animals; D015169:Colony Count, Microbial; D003257:Consumer Product Safety; D005399:Fishes; D005516:Food Microbiology; D005880:Gills / Q000737:chemistry*; D006586:Hexanes / Q000032:analysis*; D017747:Seafood / Q000592:standards*; D012621:Seasons; D014835:Volatilization
chemical_list: D006586:Hexanes