Qualitative tests for Carbohydrates Flashcards
most abundant class of organic compounds found in living
organisms.
Carbohydrates
Carbohydrates originate as products of _______.
photosynthesis
Primary function of Carbohydrates?
to provide the body with energy (most especially our
brain and nervous tissue)
Carbohydrates are also called?
Saccharides
Three elements that makes up Carbohydrates
carbon, hydrogen and oxygen
True or False: generally insoluble in polar solvents like
water except for polysaccharides
False
True or False: Carbohydrates generally soluble in non-polar solvents
like ether
False
They only one unit of saccharides in them
Monosaccharides
They are also called simple sugar
Monosaccharides
They have two units of saccharides in them
Disaccharides
The two saccharides are joined together by a __________
glycosidic bond
The two saccharides are joined together by a glycosidic bond also known as ______
glycosidic linkage
They have more than two units of saccharides in them
Polysaccharides
Monosaccharides include?
Glucose and fructose
Disaccharides include?
Lactose and sucrose
Polysaccharides include?
Starch, glycogen and cellulose
Results to violet ring at the junction of 2 liquids
Molisch’s Test
Results to Blue-black/ Indigo solution
Lugol’s tests
Results to Blue-Green Complex for Pentose and Brown complex for hexose
Bial’s test
Results to cherry red product
Seliwanoff’s Test
Results to Blue-green color
Anthrone test
Sulfuric acid/ H2SO4 dehydrates the sugar to from furfural derivatives then condensed by anthrone to form condensation product
Anthrone test
Uses 6M HCl as dehydrating agent to produce hydroxymethyfurfural the addition of resorcinol will prduce a condensation product.
Seliwanoff’s Test
HCl dehydrates pentose to form furfural and dehydrates hexoses to form 5- hydroxymethyl furfural. The furfural derivatives are condensed by orcinol and iron ion
Bial’s test
