Volatile chemical spoilage indexes of raw Atlantic salmon (Salmo salar) stored under aerobic condition in relation to microbiological and sensory shelf lives

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The purpose of this investigation was to identify and quantify the volatile chemical spoilage indexes (CSIs) for raw Atlantic salmon (Salmo salar) fillets stored under aerobic storage conditions at 4, 10 and 21 degrees C in relation to microbial and sensory shelf lives. The volatile organic compounds (VOCs) were analyzed with SPME-GC-MS technique. Through multivariate chemometric method, hierarchical cluster analysis (HCA) and Pearson's correlations, the CSIs: trimethylamine (TMA), ethanol (EtOH), 3-methyl-1-butanol (3Met-1But), acetoin and acetic acid (C-2) were selected from the group of 28 detected VOCs. At the moment of microbiological shelf life established at total viable count (TVC) of 7.0 log CFU/g, the CSIs achieved levels of 11.5, 38.3, 0.3, 24.0 and 90.7 mu g/g of salmon for TMA, EtOH, 3M-1But, acetoin and C-2, respectively. Pseudomonas spp. was found as major specific spoilage organism (SSOs), suitable for shelf life prediction using modified Gompertz model at the cut-off level of 6.5 log CFU/g. H2S producing bacteria and Brochothrix thermosphacta were considered as important spoilage microorganisms; however, they were not suitable for shelf life estimation. Partial least square (PLS) regression revealed possible associations between microorganisms and synthetized VOCs, showing correlations between Pseudomonas spp. and 3Met-1But and aldehydes synthesis, lactic acid bacteria were linked with EtOH, C-2 and esters, and B. thermosphacta with acetoin formation. (C) 2015 Elsevier Ltd. All rights reserved.
Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Issue Date
2016-02
Language
English
Article Type
Article
Keywords

COLD-SMOKED SALMON; SOLID-PHASE MICROEXTRACTION; SPME-GC-MS; ONCORHYNCHUS-GORBUSCHA; GAS-CHROMATOGRAPHY; MEAT SPOILAGE; BACTERIA; STORAGE; FISH; QUALITY

Citation

FOOD MICROBIOLOGY, v.53, pp.182 - 191

ISSN
0740-0020
DOI
10.1016/j.fm.2015.10.001
URI
http://hdl.handle.net/10203/245954
Appears in Collection
ME-Journal Papers(저널논문)
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