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Effects of ultra high hydrostatic pressure on Listeria monocytogenes and natural flora in broth, milk and fruit juices
Author(s) -
Erkmen O.,
Dogan C.
Publication year - 2004
Publication title -
international journal of food science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.831
H-Index - 96
eISSN - 1365-2621
pISSN - 0950-5423
DOI - 10.1046/j.0950-5423.2003.00754.x
Subject(s) - listeria monocytogenes , hydrostatic pressure , food science , orange juice , raw milk , bacteria , chemistry , listeria , carrot juice , lactic acid , orange (colour) , shelf life , microorganism , food preservation , microbiology and biotechnology , biology , physics , genetics , thermodynamics
Summary Listeria monocytogenes was subjected to ultra high hydrostatic pressure (UHHP) treatments from 200 to 700 MPa at 25 °C in broth, raw milk, peach juice and orange juice. Survivor curves showed that cell death increased as pressure increased. After 10 min pressure treatment at 400 MPa reductions of about 2.09 and 2.76 log CFU mL −1 in aerobic bacteria and L. monocytogenes , respectively, were produced in raw milk, this increased to 5.09 and 6.47 log CFU mL −1 , respectively, at 600 MPa. Death of bacteria at UHHP treatment was greater in orange juice than peach juice, and in peach juice than milk. Listeria monocytogenes was more sensitive to increased pressure than increased pressurization time. Injury of L. monocytogenes occurred from 0 to 100%. Factors effecting the rate of microbial inactivation are: pressure, age of cell, composition of medium, and pressurization time. UHHP inactivation can be used to extend shelf life and increase food quality during storage, and may also contribute to inactivation of L. monocytogenes .