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Lipids = fats
•
Formed from C, H and O
–
fats
,
phospholipids
,
steroids
,
lipoproteins
, some
vitamins
(lipo
soluble)
•
18-25%
of
body weight
•
Hydrophobic
–
mostly C-H
non-polar bonds
(little O
2
)
–
insoluble
in
polar solvents
like water
•
Combine with proteins
Æ
lipoproteins
Triglycerides
•
Neutral fats
Æ
single glycerol
molecule
and
3 fatty acids
–
three-carbon
glycerol molecule
is the
backbone
•
Highly
energetic molecules
–
9 calories/gram
compared to 4 for
proteins or carbohydrates
–
animals
store
triglycerides in
fat
cells if
they eat extra food (
why?
)
Triglycerides
•
One
glycerol
molecule PLUS
fatty acids
•
Fatty acids
attached
by
dehydration synthesis
Saturation of Triglycerides
•
Determined by the number of
single or double
covalent
bonds
•
Saturated
fats contain
single bonds
Æ
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- Fall '08
- Pazymino
- Proteins, Amino Acids, Fatty Acids, Vitamins
-
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