Exp 4 shelf life Flashcards
products of heterofermentation
Ethanol, CO2 and acetate, lactate
what is shelf life
It provides a guide to consumers showing the period until which food is safe and beyond which it will begin to deteriorate
A direct shelf life study can be defined as
a study in which the food is exposed to pre-selected conditions for time periods longer than expected shelf-life
Milk is highly perishable, because:
it has a neutral pH
it is a nutritious environment allowing growth of bacteria
what are the issues of plate counting
not identify anaerobic bacteria and under-estimating
MAC plates are
MacConkey plates
for both selective and differential screening
MAC plates can differentiate between lactose-fermenting and non-lactose fermenting bacteria
yes
MAC plates contain bile salts and crystal violet. What is the purpose of these ingredients?
To suppress growth of Gram-positive bacteria
