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Quantitative Microbiology (SAMPLES (End product testing (disadvantages)…
Quantitative Microbiology
Microorganism of importance
PATHOGENS
Foodborne infection
: grow in intestine, ex Salmonella
Food poisoning
: grows in food and produce TOXINS
SPOILAGE
ex: Fungi, LAB, not pathogenic
cause spoilage : 10^7 cfu/g
SAMPLES
Before pasteurisation
During distribution
Raw materials
End product testing
(disadvantages)
Time lag between sample and action
No optimisation
No feedback to personel or management
Product loss, due to recall/withdrawal
No knowledge on product after sales, it can go wrong
No guarantee for sampling end product
Risk Assessment
CONTINUED ON NEW GRAPH
GROWTH KINETICS
SECONDARY MODEL for variable = 1
Arrhenius
Ratkowsky
SECONDARY MODEL for variable > 1
Polynomials
Gamma models
PRIMARY MODEL
Exponential
Lag-exponential
Graphical
Gompertz