Accurate determination of thermal resistance of microorganisms
in liquid egg is important for designing thermal
processes to ensure food safety and shelf-life. Pflug (2003)
has reported procedures and methods that can be used to
minimize the effect of potential test-system errors on microbial
resistance data, and also listed heating and cooling lagcorrection
values for several commonly-used testing
systems including glass TDT tubes and aluminium TDT
tubes. Pflug (2003) showed that glass TDT tubes have
longer temperature-response times, equivalent-times, and
heating times for test units to reach 0.1 F below test temperature
than aluminium TDT tubes when 1 ml of water is
heated in steam or oil to 121.1 C. Therefore a new design
of TDT device based on an aluminium TDT tube should be
interesting to researchers in this area.
When using a surrogate microorganism for process validation,
its thermal tolerance must be equivalent to or
higher than the targeted pathogen. Its use, as opposed
to using an actual pathogen, derives from the need to prevent
the introduction of harmful organisms into the production
facility. The safety and liability resulting from
mishandling a pathogen to worker safety, food safety
and safety of the processing environment could be devastating.
Therefore, the use of surrogates by processing
companies is of great value to validate a thermal process
(FDA, 2000).
Accurate determination of thermal resistance of microorganismsin liquid egg is important for designing thermalprocesses to ensure food safety and shelf-life. Pflug (2003)has reported procedures and methods that can be used tominimize the effect of potential test-system errors on microbialresistance data, and also listed heating and cooling lagcorrectionvalues for several commonly-used testingsystems including glass TDT tubes and aluminium TDTtubes. Pflug (2003) showed that glass TDT tubes havelonger temperature-response times, equivalent-times, andheating times for test units to reach 0.1 F below test temperaturethan aluminium TDT tubes when 1 ml of water isheated in steam or oil to 121.1 C. Therefore a new designof TDT device based on an aluminium TDT tube should beinteresting to researchers in this area.When using a surrogate microorganism for process validation,its thermal tolerance must be equivalent to orhigher than the targeted pathogen. Its use, as opposedto using an actual pathogen, derives from the need to preventthe introduction of harmful organisms into the productionfacility. The safety and liability resulting frommishandling a pathogen to worker safety, food safetyand safety of the processing environment could be devastating.Therefore, the use of surrogates by processingcompanies is of great value to validate a thermal process(FDA, 2000).
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