1-lipid Flashcards
(34 cards)
difference btw fat and oil?
different in melting point: fat has high melting point while oil has low MP and is liquid in room T.
Is wax a fat?
No, wax is FA esterified with an alcohol.
which category does jojoba oil and bee’s wax belong to?
Wax
Liquid or solid? Jojoba oil and bee’s wax?
jojoba oil: liquid at room T
Bee’s wax: solid wax
what is application use for wax for food use?
cheese—sealing agent
apple—–polishing agent
How does wax being used in the market？
Cosmetics (monounsaturate long chain FA)
in FOOD: low-calorie food ingredient
Which category does cholesterol ester belong to?
Wax.
FA esterified to a complex alcohol
Give an example of FA esterified to a complex alcohol?
VA/retinol
cholesterol ester
Is wax biologically active?
yes
what is compound lipid?
simple lipid conjugated with non-lipid molecule.
Give examples of compound lipids?
phospholipid, sphingolpid/ glycolipid, lipoprotein.
How is phospholipid differ from triacylglyceral?
TAG: glycerol attached to 3 FA
Phospholipid: glycerol attached to 2 FA + 1 phosphate
What is phosphoric acid?
phosphate group attached to the glycerol backbone
What is a phosphatidic acid?
is the base structure of non-lipid moiety
when X=OH.
X=nitrogenous base when it is a phospholipid.
what is the proportion of phospholipid comprised in the lipid material that found in food system?
5%
Is phospholipid amphipathic?
Yes. both hydrophobic and hydrophilic
what property does phospholipid has?
emulsifying property / emulsifier
Classes of phospholipid?
- lecithin (phosphatidyl choline)
- cephalin (phosphatidyl ethanolamine)
- phosphatidyl inositol
- phosphatidyl serine
which group does cardiolipin belong to? Food sourse?
diphosphatidyl glycerol.
found in beef heart
where does glycolipid found?
In membrane lipid of plants and animals
Give an example of food source of lipoprotein?
Egg
Is HDL good for the body？Why?
yes, it accounts for 1/3 all blood-circulating chol and serve as protective mechanism for heart disease by carrying away chol from vessel walls and plaque to the liver for disposal.
Is LDL neede in the body? WHY?
Yes, because it transport substances vital to cell function and development.
why LDL bad for body?
when LDL is in excess in the blood, it can change its structure from body stress. when it accumulates in the blood vessel walls, they can lead to blockage in artery / unstable plaque build up which is prone to rupture and formation of blood clots.
