title: Analysis of volatile compounds as spoilage indicators in fresh king salmon (Oncorhynchus tshawytscha) during storage using SPME-GC-MS.
abstract: A method was developed for the analysis of salmon volatiles using solid-phase microextraction and gas chromatography-mass spectrometry. This method was used to monitor the volatiles of fresh king salmon (Oncorhynchus tshawytscha) stored in ambient air or in a 40:60 (v/v) mixture of CO2:N2 over time. The levels of several of the volatile compounds were found to change during storage, with some showing a clear difference between storage in air and storage in CO2:N2. Of these, several alcohols (cyclopentanol, Z-2-penten-1-ol, 1-penten-3-ol, and 1-octen-3-ol) and aldehydes (hexanal, octanal, E-2-pentenal, and E-2-hexenal) were identified as potential markers for salmon freshness. Several other volatiles (acetoin, ethyl benzene, propyl benzene, styrene, 3-methyl butanoic acid, and acetic acid) were identified as potential markers for salmon spoilage. A comparison of salmon harvested with and without the "rested harvesting" technique showed that E- and Z-isoeugenol levels were increased by the use of the isoeugenol based anesthetic. The use of the anesthetic did not affect the levels of any of the other compounds identified.
authors.affiliation: Department of Food Science, University of Otago, Dunedin, New Zealand.
authors.forename: Rana Lori
authors.initials: RL
authors.lastname: Wierda
authors.forename: Graham
authors.initials: G
authors.lastname: Fletcher
authors.forename: Lina
authors.initials: L
authors.lastname: Xu
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Dufour
mesh_terms: D000388:Air; D000818:Animals; D005519:Food Preservation; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D009822:Oils, Volatile / Q000032:analysis* / Q000737:chemistry* / Q000378:metabolism; D012474:Salmon / Q000378:metabolism / Q000382:microbiology
chemical_list: D009822:Oils, Volatile