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Advisor(s)
Abstract(s)
The bactericidal activity of gaseous ozone
was investigated using a commercial ozone generator. Five species of fish bacteria,
Pseudomonas putida, Shewanella putrefaciens, Brochothrix thermosphacta, Enterobacter sp.
and Lactobacillus plantarum, were inoculated on agar surfaces and exposed to
different ozonation times in a gas chamber. Results showed ozone in relatively low
concentrations ( 0·27 10 3 g l 1) was an effective bactericide of vegetative
cells of the five fish bacteria. The age of the cell culture was shown to influence the cell
response following exposure. Survival rate was not linearly related to ozonation
time, but exhibited biphasic death over an extended period. Similar bactericidal effects
were observed on fish skin treated with ozone daily in the laboratory, with
decreases of 1·0 log cfu cm 2 for the micro-organisms studied. Whole fish treated daily
in the laboratory using a commercial ozone generator showed improved scores
for sensory analyses compared with the controls. The results were statistically
significant. Fish treated on board ships were also analysed for microbiological and sensory
changes. Controls were obtained from a similar vessel without the ozone facility in the
hold. Similar trends to those recorded in the laboratory for the microbiological and sensory
results on ozonated fish were observed.
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Citation
SILVA, M. V. da; GIBBS, P. A.; Kirby, R. M. - Sensorial and microbial effects of gaseous ozone on fresh. Journal of Applied Microbiology. ISSN 1364-5072. Vol. 84 n.º 5 (1998), p. 802–810
Publisher
Wiley