Pale catechu..

pharmacognosy

1. GURUNANAK INSTITUTE OF PHARMACEUTICAL SCIENCE & TECHNOLOGY

2. PALE CATECHU By— Sumel ashique-18601914080 Supratim das-18601914082 Sumit saha-18601914081 B.pharm , 2 nd year, sec-B

3. PALE CATECHU Synonyms: Gambier Biological source: Dried aqueous extract of leaves & young twigs of Uncaria gambier . Family: Rubiaceae . Geo.source : India, Bangladesh, Singapore & Indonesia . Macroscopic character : Shape: Cuboidal Colour : Reddish brown

4. Macroscopic character: Odour: odourless Taste: Astringent Fracture: Uneven Special features: Brittle in nature, easily soluble in nature .

5. Preparation procedure: Leaves & twigs are collected & boiled with water. Extract is filtered & cooled. During cooling semi solid pasty mass formed. Placed in different dies. get solid mass on sun drying.

6. Chemical Composition: Catechin (7-33)% Catechu tannic acid & catechu red Quercetin . Gambier Fluorescein.

7. Chemical test: ( Gambier fluorescin ) Alcoholic extract of G ambier Filtered then collect the filtrate To the filtrate add NaOH with shaking Petrolium ether is added & stands for few minutes Green colour fluorescence is observed onpetroleum ether layer

8. USES: Used as Astringent. Source of tannic acid Used in Leather & Fabric industry Used in dyeing industry

9. REFERENCES… PHARMACOIGNOSY C.K KOKATE,A.P PUROHIT,S.B GOKHALE 46 th EDITION,NIRALI PRAKASHAN DRUGS CONTAINING TANNIN , Page no(9.15-9.16 )

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