IN THE NAME OF GOD - TUMSgsia.tums.ac.ir/Images/UserFiles/86/file/Carbohydrates.pdf · b-Epimerism...
Transcript of IN THE NAME OF GOD - TUMSgsia.tums.ac.ir/Images/UserFiles/86/file/Carbohydrates.pdf · b-Epimerism...
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IN THE NAME OF GOD
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Carbohydrate StructureyDisaccharides – Simple Carbs
– Sucrose (glucose & fructose)• Cookies, candy, cake, soft drinks
– Maltose (glucose & glucose)• Beans
L t ( l & l t )– Lactose (glucose & galactose)• Yogurt, cheeses, ice cream, milk
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Carbohydrate StructureCarbohydrate Structure
Polysaccharides- Complex CarbsPolysaccharides- Complex Carbs
– Starch (hundreds of glucose)• Vegetables, grain, bread, pasta
Fiber (Similar to starch non digestible)– Fiber (Similar to starch, non-digestible)• Vegetables
– Glycogen (made and found in our bodies)
• Stored energy in liver and muscle tissueStored energy in liver and muscle tissue
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Carbohydrates – Cell structure:
– Cellulose, LPS, chitin
Chitin in exoskeleton
Cellulose in plant cell walls Lipopolysaccharides (LPS) in bacterial cell allin bacterial cell wall
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Carbohydrate StructureCarbohydrate Structure
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MS/ Isomerisms
Furanose/ Pyranose Chair/ Boat
Ring ConformationalFuranose/ Pyranose Chair/ Boat
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Sugars/ General structure/ Cyclization
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MS/ isomerisms/ optic / Mutarotaion• Mutarotaion: α or β anomer can convert to each other
via an open chain intermediate. In doing so the degree of polarized light rotation changespolarized light rotation changes.
At equilibrium 1/3 will be α and 2/3 will be β anomer.
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MS/ Chiral carbon & optic isomer number For each chiral center there are two optic
isomers. They are not superimposable. The number of chiral carbon in: Linear aldoses: n= N-2 so linear Glc has
24 optic isomers Cyclic aldoses: n=N-1 so cyclic Glc has
25 optic isomers Linear ketoses: n= N-3 so linear Fru has
23 optic isomersC li k t N 2 li F h Cyclic ketoses: n= N-2 so cyclic Fru has
24 optic isomers
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• * D & L do not refer to the rotation ofMS/ isomerisms/3- Optic/ 1- D & L
• D & L do not refer to the rotation of polarized light, but are stand for the family of the sugar. For showing the rotation of g gpolarized light (+) or (- )sign are used. * D- family sugars are abundant, natural
th t d i d f D l ld h dsugars that are derived from D- glyceraldehyde so the OH group of the last asymmetric atom is at right.at right.* L- family sugars are rear sugars and just found in the oligosaccharides present as gantigenic moieties. They can not bemetabolized and make energy. The OH groupof the last asymmetric atom is at leftof the last asymmetric atom is at left.
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D and L MonosaccharidesD and L Monosaccharides
The OH on the chiral atom farthest from the carbonyl The —OH on the chiral atom farthest from the carbonyl group is used to assign the D or L configuration
D
D L
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MS/ isomerisms/3- Optic/ 2- Enantiomerism( mirror image)
* Definition:
( mirror image)
* All OH groups have opposite orientation
* A pair of enantiomers have A pair of enantiomers have same name, but are shown with D or L letters .
* Th t t l i d li ht* They rotate polarized light equally into two opposite directions, if one is D(-) the
th ill b L( )other one will be L(+).Example: D(+) Glc & L(-) Glc
or D(+)Fru & L(-) Fru( ) ( )
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MS/ isomerisms/St i iStreoisomerism
1- Optica- Enantiomerismb- Epimerismpc- Anomerism
2- Conformationala- Chairb- Boat
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MS/ isomerisms/3- Optic/ 3- Epimerism
Definition: The differenceDefinition: The difference between the OH orientationof just one asymmetric carbon atom other than the l t (th th tlast one (the one that determines the family of a sugar).Example:Example: Mannose ( epimer 2 Glc)Allose ( epimer 3 Glc)Galactose ( epimer 4 Glc)Galactose ( epimer 4 Glc)
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MS/ isomerisms/3- Optic/ 4- Anomerism
Definition:* OH orientation of anomeric
b i th b i f thicarbon is the basis of this classification.
β anomer : Same orientation with the side chain( the last carbon atom)α anomer : opposit orientation with the side chain
• Example: α or β anomer of D(+)Glc.
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Isomers
Steroisomers Same atom connectivity
different arrangement in pace
Functional Isomers different atom connectivity
Ketose
d g p
Aldose
Conformational
Configurational
Conformational
Boat ChairEnvelop
OPTIC Ring
Furan Pyran
E ti Diasteromers are not Anomers
y
Enantiomers are mirror image mirror image (epimers)
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MS/ Reactions/Oxidation1 Ald i id O id ti f ld h d 2: Uronic acid: Oxidation of1: Aldonic acid: Oxidation of aldehyde
Group.Example: Gluconic acid.
2: Uronic acid: Oxidation of primary alcohol group.
Example: glucoronic acid.
3: Aldaric acid: Oxidation of aldehyde and primary alcohol groupp y g pExample: Glucaric acid ( saccharic acid),Mannaric acid ( arabic gum)Galactaric acid (mucic acid)Galactaric acid (mucic acid)
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MS/ Reactions/OxidationMS/ Reactions/Oxidation
4: Furfural formation4: Furfural formationOxidation and dehydration of M.S by very strong acidsvery strong acidsExample: Furfural from pentoses and h d th l f f l f hhydroxymethyl furfural from hexoses
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MS/ Reactions/ Reduction1 Polyalcohols1-Polyalcohols
* Reduction by gaining hydrogenExample: Sorbitol from glucoseExample: Sorbitol from glucose,fructose and mannose
2- Deoxysugarsy g*Reduction by losing oxygen = deoxysugar formationE lExample:
Deoxyribose form ribose,Fucose from L-galactoseFucose from L galactose
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MS/ Reactions/ AminationMS/ Reactions/ AminationAmino sugars: Glucosamine, mannosamine
N- acetyl amino sugars : N- acetyl glucosamine, N- acetyl mannosamineSialic acids: NAM+ PA
Glc A Man A Gal A NAG
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Amylose amylopectin
cellulose
glycogen
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Amylose and amylopectin are the 2 forms of starch. Amylopectinis a highly branched structure, with branches occurring every 12to 30 residues
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i f lsuspensions of amylosein water adopt a helical
conformation
i di (I2) i t iiodine (I2) can insert inthe middle of the amylosehelix to give a blue colorthat is characteristic and
di ti f t hdiagnostic for starch
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Honey also contains glucose and fructose along withsome volatile oilssome volatile oils
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Glycosaminoglycans
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GlycosaminoglycansGlycosaminoglycans
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A portion of the structure of heparinHeparin is a carbohydrate with anticoagulant properties. It is used in blood
banks to prevent clotting and in the prevention of blood clots in patients p g p precovering from serious injury or surgery
Numerous derivatives of heparin have been made (LMWH, Fondaparinux)
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Hyaluronate:material used to
t th llcement the cellsinto a tissue
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Structure ofid lpeptidoglycan
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Bacterial cell wallBacterial cell wall
• provide strength and rigidity for theprovide strength and rigidity for the organism
• consists of a polypeptide-polysaccharide• consists of a polypeptide-polysaccharide known as petidoglycan or mureindetermines the Gram staining• determines the Gram staining characteristic of the bacteria
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Cell wall of Gram-positive b ibacteria
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Gram-negative bacteriaGram negative bacteria
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Teichoic acids are covalently linked to the peptidoglycan of gram-positivebacteria. These polymers of glycerol phosphate (a and b) or ribitol phosphate (c) are linked by
phosphodiester bondsphosphodiester bonds
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Serine or threonine O-linked saccharides
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Aspargine N-linked glycoproteinsAspargine N linked glycoproteins
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These glycoproteins are found inThe blood of Arctic and Antarcticfish enabling these to live at sub-zero water temperatures
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Some of the oligosaccharides found in N-linked glycoproteins
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Proteoglycans are a family of glycoproteins
h b h d t i tiwhose carbohydrate moieties are predominantly
glycosaminoglycans
str ct res are q ite di erse as arestructures are quite diverse as are sizes
examples: versican, serglycin, decorin, syndecan
Functions:- modulate cell growth processesprovide flexibility and resiliency to- provide flexibility and resiliency to
cartilage
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A ganglioside (GM1)
O
CH2OH
OHO
CH2OH
OHO
CH2OH
O
CH2OH
HO
O
N-Acetyl-D-galactosamine D-galactose D-glucose
H OH
H
OH
O
H NH
H
H OH
H
H
H OH
H
OH H
H
O
O
CH2HC
HCHOC O
H
H
D-Galactose
NH
C O
R
C
C
O
O
CH3
NH
H
CHOH
CHOH
COO-C
O
H3C
H
H
OH
CH2OH
H
HH
N-acetylneuraminidate (sialic acid)
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