Lecture 6 - Factors influencing the microbial growth in foods Flashcards
1
Q
Factors affecting growth of microorganisms in food, can broadly be divided into…? (2)
A
intrinsic and extrinsic factors
2
Q
Examples of intrinsic factors affecting growth of microorganisms in food.
A
pH
antimicrobial compounds
structure
nutrients (diff bacteria favor diff nutrients)
3
Q
Examples of extrinsic factors affecting growth of microorganisms in food.
A
temperature
atmosphere: gas composition, humidity
4
Q
a^w =
A
water activity
* water available for bacteria
5
Q
Hurdle effect is…
A
Combination of intrinsic and extrinsic factors to assure food safety and quality during shelf-life.
6
Q
Vacuum packaging and modified atmosphere packaging alters?
A
→ Redox potential,
7
Q
Preservatives and thermal treatment → alter?
A
Microbiota
8
Q
Salting and sugaring → alter?
A
Water activity
