1
Q
Water as a polar solvent…
A
- dissolves hydrophilic compounds
– rejects hydrophobic molecules
2
Q
What is water concentration in most foods
A
~55M
3
Q
What is AW
A
Water activity (AW) measures free water, i.e.
AW is the amount of water in food that is
available to microorganisms for growth
4
Q
What is moisture content?
A
Amount of bound and free water in a sample
Quantitative amount of water in a sample
5
Q
What is water holding capacity
A
ability of food to hold entrapped water
6
Q
What is water activity a ratio of
A
AW = P / Po
P vapor pressure in a product/solution
Po vapor pressure of pure water
… at a specified temperature (T)
AW = relative humidity (RH) / 100 at T
food science
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