Page 61 - final Practical handout PG 303-Cogno-2- 2024-2025

Clinical Pharm D Level 2 Pharmacognosy-2 (PG 303)

Unorganized Drugs

Gums Dried extracts

Gum acacia Gum tragacanth Agar-Agar Gelatin

(Gum Arabic) ‫صمغ الكثيرة‬ ‫جيلاتين اجار‬

‫الصمغ العربي‬

Chemically Ca, K, Mg salts of polyuronides,
Pic.
when hydrolyzed give sugar acids

and mixtures of sugars.

Rounded or Ribbon-shaped Strips, flattened Pale yellowish
ovoid tears flakes sticks, diatoms, translucent
granulated sheets or
Shape powder. granular powder

Texture Brittle Hard
Taste Gummy Mucilaginous

Chemical +ve (deep blue) -ve 1. Purple color 1. White ppt.
test: with dil. Iodine with tannic
-ve (yellowish Scattered blue solution. acid.
Oxidase brown) spots
enzyme Canary yellow 2. Deep red with 2. Brick red with
Iodine -ve after heating ruthenium red. million’s
Flocculant white reagent
NaOH -ve ppt 3. BaCl₂ test:
white ppt. with
Lead Flocculant -ve sulphonated
acetate white ppt polysaccharide
+ve -ve Agaropectin
Lead
subacetate

Borax

49