REACTIONS OF CARBOHYDRATES (Activity 2a) Flashcards
Sugars, starches, gums and cellulose are a group of substances that comprises
carbohydrates
mucic acid test, sugars with the formation of crystals
galactose, lactose
mucic acid test, sugars with no formation of crystals
glucose, fructose
Concentrate H2SO4 (sulfuric acid), alpha napthol
Molisch test
Drop of iodine, (KI) potassium iodine, concentrated nitric acid (HNO3)
Iodine test
Concentrated HNO3, distilled water
Mucic acid test
Seliwanoff reagent, solution of orcinol, hydrochloride (HCl), ferric chloride (FeCl7)
Bials-orcinol test
Resorcinol, Concentrated HCl, distilled water
Seliwanoff’s test
Test for the presence of carbohydrates or sugars, formation of purple-colored ring at junction of two layers
Molisch test
Test for the presence of starch, formation of dark blue/purple/black solution
Iodine test
Test for the presence of galactose or its derivatives, formation of sandy white crystal
Mucic acid test
Test for the presence of pentoses, formation of bluish solution
Bial’s-orcinol test
Test for the presence of ketones from aldoses, formation of cherry red solution
Seliwanoff’s test
Starch and glycogen can be distinguished from other polysaccharides by using
Lugol’s iodine reagent.
Qualitative test for carbohydrates maybe based on the production of ____ and
____ by treating them with strong acids and condensing them with various
phenolic compounds to form colored condensation products.
furfural and
hydroxymethylfurfural
