Canning and thermal strerilisation Flashcards
1
Q
what is Clostridium botulinum?
A
a bacteria that produce deadly toxins
2
Q
Is clostridium botulinum aerobic or anaerobic?
A
anaerobic
3
Q
what is the z-value?
A
the increase in temperature that is required to reduce the D-value by 1/10 (1 log)
4
Q
what is commercially sterile?
A
when the number of surviving clostridium botulinum spores is reduced by 12 order of magnitude
5
Q
what is the ideal gas equation?
A
Pv=nRT
6
Q
What does psi stand for?
A
pounds per square inch
7
Q
what is 15psi equivalent to?
A
121C
8
Q
What is the D-value?
A
the time in which 1 log reduction occurs and 90% of spores are reduced
9
Q
how long and at what temperature does it take for 1 log reduction of clostridium botulinum?
A
12s at 121C
10
Q
how is the population of spores measured?
A
first kinetic order
