Food Quality

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How many records in Combase
50,000
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Predictive modelling is used in the industry specifically for?
Product innovation (speed of microbial inactivation, operational support and incident support)
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What does the lag phase do?
microbial cells adapts to their enviroment
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Expontential growth phase?
Cells rapidly multipy
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Stationary phase?
Mixinum microbal population met
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Intrisic factors?
Physical, chemical and morobial e.g. water, nutritnets Ph
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Extinsic
e.g. oxygen, wavelength, characteristics
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predictive modelling def
defined as a set of mathmatical equations that descrive the number of microorganisms present in a lababority media or in a food product, as a function of some enviromental variables such as in intrinsic and extrinisic of the food product
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Concept predive modelling
he concept of predictive microbiology was developed to evaluate the effect of processing, distribution and storage operations on the microbiological safety of foods
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Additional focus of PM
Additional information is needed on how the competitive bacteria or the variables that control the process and the food affect the main environmental parameters (temperature, pH and aw) used in predictive microbial models
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Primary?
Primary models describe the change of the bacterial number over time under environmental conditions and generate information about the microorganism such as generation time and lag phase duration.
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Secondaru?
econdary models describe the evolution of one or more parameters of a primary model in relation to one or more changes in environmental conditions.
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Teritary
Tertiary models take modelling to its final form. They are applications to one or more primary or secondary models, incorporated into a user-friendly computer software package. Can desribe the full evolution of a microbial population (envirmental)
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What is combase?
online collection of data that describes how pathogenic microorgnaism survive and growth under a variety of conditions
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What do combase records show?
food processing and storage conditions affect the growth of food poisoining bacteria, by describing how different bacteria are affected by changes in pH, temperature, water content and other factors
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How is combase done?
Mathmatical modelling software can take this data and use it predict how these bacteria growth under a range of parameters
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Signifcant progress made
1980's - PC, expert advise,
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Now?
Can model growth of bacteria, survval in food, inactivation, interactions, competition, competition between micro-organisms and effects of unit operations
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Predictive models developed for?
Thermal processing, growth of bacteria in processed food during storage, and effects of changes in composition to predict shelf life stability
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Predicve models quanitify...
microbial populations or probabilities of presence of microorganisms
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Earliest models of microbial survival
Developed to predict inactivation due to thermal processing
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Card 2

Front

Predictive modelling is used in the industry specifically for?

Back

Product innovation (speed of microbial inactivation, operational support and incident support)

Card 3

Front

What does the lag phase do?

Back

Preview of the front of card 3

Card 4

Front

Expontential growth phase?

Back

Preview of the front of card 4

Card 5

Front

Stationary phase?

Back

Preview of the front of card 5
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