Lecture 2- Milk Flashcards
Biological definition of milk
Liquid normally secreted by female mammals for nourishment of their young
Chemical definition of milk
A colloidal suspension of organic and inorganic food substances consisting of water, fats, carbohydrates, proteins, mineral salts, some bacteria, enzymes, and vitamins.
Legal definition of milk
= lawyer wording and lots of wiggle room
% water in milk
87%
% fat in milk
3.8% (w/ genetics up to 4.2%)
% caseins in milk
2.8%
% albumins/lactalbumin/globulins in milk
.7
% lactose/sugar in milk
5.0 = leading solid component
% ash (minerals) in milk
.7%
% total solids in milk
13%
% total solids non-fat (SNF) in milk
9.2%
% Proteins in milk
3.5%
% fat in whole milk
3.2%
Fat exists in milk as a …
Temporary emulsion
Fat globules membranes contain 3 things and have a ____ charge
Phospholipids, proteins, enzymes, negative
What percent of milk liquids in triglycerides
98-99%
What percent of milk lipids in phospholipids
.2-1%, in membrane and only partially soluble in water= emulsifying agent
What percent of milk lipids is sterols? Waxes and vitamins are trace.
.25%
Triglycerides have a
3-carbon backbone
Fatty acid
R-C-OH, with =O on C
Saturated=
All single bonds between carbons
Unsaturated=
At least 1 double bond in carbon chain
What percent of fatty acids in milk are saturated
66% 2/3
What percent of fatty acids in milk are unsaturated
34% 1/3