Thief Lipids
group of compounds that
'
Lipids are a diverse are insoluble in water but soluble
in
organic solvents such as ethanol
•
The main groups of lipids are triglycerides ( fats and oils ) and
phospholipids .
like hydrogen but they
'
carbohydrates lipids ,
contain carbon , and oxygen ,
have a higher proportion of hydrogen and a lower proportion of
oxygen .
ROLE OF LIPIDS
heat insulation In mammals , adipose tissue ( which contains the
lipids) underneath the skin helps reduce heat loss .
Protection Adipose tissue around delicate organs such as
the kidneys acts as a cushion against impacts .
Source of energy
-
When oxidised , lipids provide more than twice
that ofcarbohydrates and release voluble water .
Waterproofing lipids -
are insoluble in water and therefore
useful for waterproofing . Both plants and insects have waxy lipid ,
cuticles that conserve water ,
white mammals produce an oily
secretion from glands in the skin .
fatty acids
TRIGLYCERIDES =
glycerol
Triglycerides are made from joined to 3 fatty
•
acid
a
glycerol backbone
chains
•
Each fatty acid forms an ester bond with glycerol in a condensation
reaction .
The three fatty acids in a triglyceride can be the same or different
9
.
•
The types of fatty acids in a triglyceride affects its properties ,
such
as its melting point .
structure
alcohol with the formula C3H 803 It contains hydroxyl
'
glycerol is an .
3
(01-1) groups .
Fatty acids hydrocarbons containing
'
are long chain a carboxylic
( CO0H ) group at one end .
the formula fatty acid is CH3 ( CH2)n CO0H
-
general for a
,
where n is
usually an even number .
Y
H OH
f
-
-
i. iii. E.
H '
f OH
°× '
T i i'
-
-
c- c - c- c - - -
,
H -
C OH '
ti ti f, I, f,
-
,
OH
ti I,
1-1
acids
glycerol fatty
group of compounds that
'
Lipids are a diverse are insoluble in water but soluble
in
organic solvents such as ethanol
•
The main groups of lipids are triglycerides ( fats and oils ) and
phospholipids .
like hydrogen but they
'
carbohydrates lipids ,
contain carbon , and oxygen ,
have a higher proportion of hydrogen and a lower proportion of
oxygen .
ROLE OF LIPIDS
heat insulation In mammals , adipose tissue ( which contains the
lipids) underneath the skin helps reduce heat loss .
Protection Adipose tissue around delicate organs such as
the kidneys acts as a cushion against impacts .
Source of energy
-
When oxidised , lipids provide more than twice
that ofcarbohydrates and release voluble water .
Waterproofing lipids -
are insoluble in water and therefore
useful for waterproofing . Both plants and insects have waxy lipid ,
cuticles that conserve water ,
white mammals produce an oily
secretion from glands in the skin .
fatty acids
TRIGLYCERIDES =
glycerol
Triglycerides are made from joined to 3 fatty
•
acid
a
glycerol backbone
chains
•
Each fatty acid forms an ester bond with glycerol in a condensation
reaction .
The three fatty acids in a triglyceride can be the same or different
9
.
•
The types of fatty acids in a triglyceride affects its properties ,
such
as its melting point .
structure
alcohol with the formula C3H 803 It contains hydroxyl
'
glycerol is an .
3
(01-1) groups .
Fatty acids hydrocarbons containing
'
are long chain a carboxylic
( CO0H ) group at one end .
the formula fatty acid is CH3 ( CH2)n CO0H
-
general for a
,
where n is
usually an even number .
Y
H OH
f
-
-
i. iii. E.
H '
f OH
°× '
T i i'
-
-
c- c - c- c - - -
,
H -
C OH '
ti ti f, I, f,
-
,
OH
ti I,
1-1
acids
glycerol fatty
