Page 20 - Phytochemistry -1 (PG404) / Clinical Pharmacy 2nd level students ( 2019 )

Clinical pharmacy PharmD program Third level Phytochemistry-1 (PG-504)

Amylose Amylopectin

Constitute ~ 25% of starch Constitute ~ 75% of starch
molecule. molecule.

Partial water soluble Water insoluble

Composed of straight chains of It is a branched molecule consisting
glucose units joined by α-1,4- of glucose units also joined by α-
glycosidic bonds. 1,4-glycosidic bonds (at the

straight chain), and few by α-1,6-
glycosidic bonds (at the branching
points).

Blue color with I₂ violet/ purple color with I₂

Hydrolysis with maltase enzyme Hydrolysis with maltase enzyme
yield maltose. yield maltose + dextrin.
N.B. This enzyme hydrolyze only

α-1,4-linked glucose

Tests for identity

I. Microscopic examination: to detect the source of starch: maize, Corn
or wheat starch.

II. Iodine test

20