This document discusses carbohydrates, including their importance, chemistry, and classification. It provides the following key points:
- Carbohydrates are classified into four main groups: monosaccharides, disaccharides, oligosaccharides, and polysaccharides. Monosaccharides include glucose and fructose. Disaccharides are formed by linking two monosaccharides, such as sucrose.
- Carbohydrates serve important functions like energy storage, structural components of cells, and roles in biological processes. They are also used industrially as sweeteners, binders, and other applications.
- Tests like Fehling's solution and Tollens' reagent are used to identify the presence of carbohydr
bio chemistry
كيمياء حيوية جامعة الملك سعود
chemistry
كيمياء جامعية
0503964728
محمد منير كيمياء
ابو يوسف
all branched of chemistry bio chemistry - organic chemistry - inorganic chemistry - analytically - spectra - d-block
bio chemistry
كيمياء حيوية جامعة الملك سعود
chemistry
كيمياء جامعية
0503964728
محمد منير كيمياء
ابو يوسف
all branched of chemistry bio chemistry - organic chemistry - inorganic chemistry - analytically - spectra - d-block
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Any of a large group of organic compounds occurring in foods and living tissues and including sugars, starch, and cellulose. They contain hydrogen and oxygen in the same ratio as water (2:1) and typically can be broken down to release energy in the animal body.
Chemically, carbohydrates are defined as “optically active polyhydroxy aldehydes or ketones or the compounds which produce units of such type on hydrolysis”.
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http://sandymillin.wordpress.com/iateflwebinar2024
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3. Introduction
• Chemically: Polyhydroxy aldehydes and
ketones, having hydrogen and oxygen in a ratio
of water (2:1)
e.g. Ribose (C5H10 O5) and Glucose (C6H12 O6)
4. • General formula Cn(H2O)n, hence, also
called hydrates of carbon
• Also include substances, which upon
hydrolysis produce polyhydroxy
aldehydes and ketones
5. Importance of carbohydrates
• Major source of energy (4.1C)
• Serve as stored forms of energy as
glycogen in;
–Liver
–muscles
6. • Involved in recognition processes of
immunoglobulins
• Are important components of brain cells e.g.
neuraminic acids, cerebrosides (Glycolipids)
and gangliosides
• Are important component of nucleic acids e.g.
pentose sugar ribose and deoxyribose
8. Contn’d
• Function as anticoagulant (Heparin)
• Plasma expanders (Dextran)
• Part of parenteral nutrition
• Used as Dietary fibers e.g. Cellulose
• Protein sparing action
• Decrease breakdown of fatty acids, thus
prevent ketosis
9. • Used in analytical techniques: paper
chromatography, Agar-agar and starch
11. Monosaccharides
• Carbohydrates which can’t further be broken down
into simpler units by hydrolysis
• Classified according to the number of carbon atoms
present in them
– For example trioses, tetroses and hexoses
12. • Usually have 3-9 carbon atoms
• Further sub-classified into
– aldoses and ketoses
• Exact name is based on:
– number of carbons atoms &
– presence of aldehyde or ketone group
– i.e aldotriose or ketotriose
14. • Monosaccharides also include derivatives of
above mentioned monosaccharides e.g.
– amino sugars
– sugar alcohols
– sugar acids
– sugar esters of sulfuric acid
– sugar esters of phosphoric acid
15. Disaccharides
• Biose
• Formed when two monosaccharides undergo
a condensation reaction, which involves the
elimination of a water molecule
Sucrose
16. Oligosaccharides
• Greek word oligos, meaning "a few" and
sacchar meaning "sugar“
• Saccharide polymers containing a small
number (typically 3 to 10) of component
sugars- monosaccharaides
For example Raffinose
17. Polysaccharides
• Polymeric carbohydrate structures, formed
by repeating units (either mono- or di-
saccharides) joined together by glycoside
bond
• Such structures are often linear, but may
contain various degrees of branching
• Polysaccharides are often quite
heterogeneous, containing slight
modifications of the repeating units
18. • When all the monosaccharides in a
polysaccharide are of same type the
polysaccharide is called a
homopolysaccharide: starch and glycogen, but
when more than one type of monosaccharides
are present, they are called
heteropolysaccharides: pectin and lignin
• Polysaccharides have a general formula of
(C6H10O5)n
• Not sweet, hence called non-sugars
19. H O
OH
H
OHH
OH
CH2OH
H
O H
H
OHH
OH
CH2OH
H
O
HH H O
O
H
OHH
OH
CH2OH
H
H H O
H
OHH
OH
CH2OH
H
OH
HH O
O
H
OHH
OH
CH2OH
H
O
H
1
6
5
4
3
1
2
amylose
cellulose
H O
OH
H
OHH
OH
CH2OH
H
O
H
OHH
OH
CH2OH
H
O
H H O
O H
OHH
OH
CH2OH
H
H O
H
OHH
OH
CH2OH
H
H
OHH O
O H
OHH
OH
CH2OH
H
O
H H H H
1
6
5
4
3
1
2
Upon acid hydrolysis produce monosaccharides
20. Oxidation of glucose
• Mild oxidizing agents such as bromine water convert
glucose to gluconic acid, which is a single step
reaction
• This reaction is used to differentiate sugars having –
CHO (reducing) group and those yielding such group
21. Example is Fehling's solution test
• Fehling's solution is composed of equal parts
of two solutions:
1-Fehling's solution A
69.28 g copper sulfate pentahydrate
dissolved in 1 litre of distilled water
2-Fehling's Solution B
346 g potassium sodium tartrate and 120 g
sodium hydroxide in 1 litre of distilled
water
22.
23. • Under alkaline conditions fructose is converted
to glucose and mannose
Fructose also give positive test
24. Tollens' reagent test "silver mirror"
• Tollens' reagent: when silver nitrate solution is
treated with NaOH, it forms precipitate and
then NH4OH is added till the precipitate is
dissolved-[Ag(NH3)2]+
• The diammine silver complex is an oxidizing
agent, which is itself reduced to silver metal