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1382424293 Essay

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Carbohydrates
Identification of Unknown
Carbohydrates
By
Dr. Mohammed Golam Rasul

2

3

Objective
• Study the various qualitative tests of carbohydrates.
• Identify an unknown carbohydrate.

Definition
• Organic compounds composed of C, H and O with H
and O present in the same ratio as in water.
• Example: Glucose C6H12O6. [Cm(H2O) n ] m, n= where m and n are integer.

• Exceptions:
– Deoxy sugars such as Rhamnose C6H12O5, Acetic acid
C2H4O2. Formaldehyde HCHO, Lactic acid C3H6O3

• New definition:
Optically active Polyhydroxy aldehydes or ketones, or
substances that hydrolyze to yield polyhydroxy
aldehydes or ketones.

Physical Characteristics

State:
Sugars are white, crystalline in shape and with
sharp melting points, while polysaccharides
are white amorphous solids.
Taste:
Sugars have a sweet taste. Polysaccharides
are tasteless.
Solubility:
Mo...

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