Lipids
•Classification
•Properties
•Function
•Basic Structure
Thought for today: If someone calls you a “FAT HEAD”,
first compliment them on their biochemical insight,
before you punch them in their fat head”.
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Lipids Classification- Biochemistry - Lecture Slides, Slides of Biochemistry
Lipids, Basic Structure, What is a Lipid?, Any Substance That is Insoluble in Water, Saturated Fatty Acid, Charged Vs Neutral, Saturated Vs Unsaturated, Esterified Vs Non-Esterified, Odd Chain Vs Even Chain, Anatomy of a C14 Saturated Fatty Acid are main points of this lecture.
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2011/2012
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Lipids
• Classification
• Properties
• Function
• Basic Structure
Thought for today: If someone calls you a “FAT HEAD”,
first compliment them on their biochemical insight,
before you punch them in their fat head”.
What is a Lipid?
Any substance that is insoluble in water but
soluble in organic solvents
Does this mean any water insoluble compound?
Yes
What are some examples I would recognize?
Cholesterol….a steroid
Stearic acid….a saturated fatty acid
Oleic acid…an unsaturated fatty acid
Bees wax….a fatty acid ester
Vitamins A,D,E,K…the fat-soluble vitamins
Tripalmitin…a triacylglycerol
Lecithin…a membrane glycerophospholipid
Anatomy of a C14 Saturated Fatty acid
CH
3
COO
CH 2
CH
2
CH
2
CH
2
CH
2
CH
2
CH
2
CH
2
CH
2
CH
2
CH
2
CH
2
Methyl end group
Non-Polar
Charged carboxyl
Fatty Acids
Rule: A lipid begins when water insolubility begins
CH
3
CH
2
Not yet
CH
2
CH
2
CH
2
CH
2
CH
2
Getting There
CH
2
CH
2
CH
2
Whoa!
CH
2
COOH
C12 saturated fatty acid…..Lauric acid
C14 …..Myristic acid
C16…..Palmitic acid
C18…..Stearic acid
C20…..Arachidic
Rule: Cis double bonds put Kinks in fatty acid chains.
Corr: The more the double bonds the greater the bend
Cis D.B.
Saturated 1 D.B.
2 D.B.
Cis D.B.
Trans Fatty Acids are to be avoided for health reasons
Complex Lipids
What are they?
Lipids molecules comprised of more than one
component….the individual components are readily
disassembled by acid or base hydrolysis
Give me some examples
Acylglycerols = fatty acids esterified to glycerol
C-OH
CH
C-OH
HO-
H
H
H
H
Glycerol
R-CH
2
C-O
O -O-C-CH
2
C-R
O
-O-C-CH
2
C-R
O
Triacylglycerol
(Triglyceride)
Monoacylglycerol
Diacylglycerol
Triacylglycerol
Saturated
Mono-
Unsaturated
HO
Cholesterol