Page 150 - Pharmacognosy-II (06-PG 303)

Extracts
1. Agar-agar/ Japanese Isinglass

Origin and preparation: The polysaccharides from various species of

Rhodophyceae (red algae) mainly belonging to the genus Gelidium.
-Prepared by collection, spreading on the beach to bleach, treating the algae
with boiling water; the extract is filtered whilst HOT, concentrated, dried then
cut.

• Color: yellowish white
• Taste: mucilaginous, and salty if non pure.
• Solubility: swells in cold water, soluble in hot water forming gel on

cooling.

144