The flesh from physically damaged tuna showed higher total
viable counts but an equal number of mesophilic histamine forming
bacteria than the flesh of undamaged tuna, indicatingthat the inappropriate handling of tuna during the processes of catching, freezing, transporting, and discharging greatly
influences microbiological contamination. The histamine level
of just-thawed tuna was lower than 50 ppm, and there was no
presence of psychrophilic histamine-forming bacteria in any of
the tuna samples investigated, and there was no difference in
histamine level between damaged and undamaged muscles right
after thawing. Therefore, histamine levels higher than 50 ppm
in final products can be associated with temperature abuse
conditions during processing. Morganella morganii was the most
active histamine-forming bacterium found in yellowfin tuna.
The flesh from physically damaged tuna showed higher total
viable counts but an equal number of mesophilic histamine forming
bacteria than the flesh of undamaged tuna, indicatingthat the inappropriate handling of tuna during the processes of catching, freezing, transporting, and discharging greatly
influences microbiological contamination. The histamine level
of just-thawed tuna was lower than 50 ppm, and there was no
presence of psychrophilic histamine-forming bacteria in any of
the tuna samples investigated, and there was no difference in
histamine level between damaged and undamaged muscles right
after thawing. Therefore, histamine levels higher than 50 ppm
in final products can be associated with temperature abuse
conditions during processing. Morganella morganii was the most
active histamine-forming bacterium found in yellowfin tuna.
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