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http://dx.doi.org/10.3746/jkfn.2006.35.7.935

High Hydrostatic Pressure Sterilization of Vibrio parahaemolyticus and Escherichia coli in Raw Oyster  

Park, Whan-Jun (Dept. of Food Bioengineering, Cheju National University)
Jwa, Mi-Kyung (Dept. of Food Bioengineering, Cheju National University)
Hyun, Sun-Hee (Dept. of Food Bioengineering, Cheju National University)
Lim, Sang-Bin (Dept. of Food Bioengineering, Cheju National University)
Song, Dae-Jin (Dept. of Food Bioengineering, Cheju National University)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.35, no.7, 2006 , pp. 935-939 More about this Journal
Abstract
Raw oyster (Crassostrea gigas) was inoculated with Vibrio parahaemolyticus and Escherichia coli, treated with high hydrostatic pressure and evaluated for microbial counts. Cell death of V. parahaemolyticus (Vp) increased with the increase of applied pressure. Vp starting inoculum of $3.8{\times}10^5\;CFU/mL$ was totally eliminated after exposure to 200 MPa for 10 min at $22^{\circ}C$ Viable cell of Vp decreased with the increase in treatment time and dropped below the detection limit with treament of 25 min at $22^{\circ}C/150\;MPa$. The number of Vp by treatment of $0^{\circ}C$ and $10^{\circ}C$ for 20 and 25 mon at 100 MPa, respectively. For E. coli, there was an initial lag up to 250 MPa gollowed by a rapid decline. Treatment at 325 MPa/$22^{\circ}C$ for 15 min caused 5-log reduction, while that at 375 MPa resulted in total reduction of starting inoculum of $4.0{\times}10^7\;CFU/mL$. Lower treatment temperature showed higher killing effect of E. coli at the same treatment pressure and time. Viable cell of E. coli decreased with the increase in treatment time, and 4-log reduction was achieved with treatment of 5 min at $10^{\circ}C$/350 MPa and then total reduction was achieved after treatment of 15 mon. Higher pressure, lower temperature and longer time were more effective in sterilizing V. parahaemolyticus and E. coli.
Keywords
oyster; high hydrostatic pressure treatment; V. parahaemolyticus; E. coli;
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