CATECHU

Presentation on catechu

1. PRESENTATION ON CATECHU ~prepared by: Raj Narayan Saha 2020/BPH/0105 Bilkis Hussain 2020/BPH/0104 ~Guided by: Dr.Sudarshana Borah Khanikor

2. Contents: Synonym Biological source Morphology Chemical constituents Chemical tests Therapeutic uses

3. BLACK CATECHU Synonyms Cutch, black catechu, kattha . Biological source It is the dried aqueous extract prepared from the heartwooof Acacia catechu Willdenow , belonging to family Leguminosae .

4. Morphology Colour: Black or brownish black mass. Odour: Odourless Astringent and subsequently sweet taste. Size:Irregular mass. Extra features: Outer surface is firm and brittle. When broken the fractured surface appears glassy with small cavities.

5. Chemical constituents 10% Acacatechin . Also called as Acacia catechin U ndergoes to give catechutannic acid. Catechu red, quercetin, gum , quercitrin . Does not contain chlorophyll and also the fluorescent substance present in Pale catechu. Catechol Catechin

6. Chemical tests With Ferric Chloride solution, it gives Bluish-black col our . With Vanillin and Hydrochloric acid Black Catechu gives Pink or Red col our . Aqueous solution of Black Catechu with Lime Water g ives Brown c olour .

7. Therapeutic uses Cutch is used in medicine as astringent. It cures troubles of m outh , diseases of the throat and d iarrhoea . It also increases a ppetite . In India and eastern countries, it is used in betel leaves f or chewing. In dyeing industries, cutch used for dyeing fabrics br own or black.

8. PALE CATECHU Synonyms Gambier, Catechu, Gambir . Biological source Gambier or pale catechu is a dried aqueous e x t ra ct produced from the leaves and young twigs/shoots of Uncaria gambier Roxburgh . belonging to family Rub i aceae .

9. Morphology Colour: Dull reddish brown colour externally and pale brownto buff colour internally. Odour: Odourless Taste: At first it is bitter and astringent but later it is sweet. Shape: st rips, flakes or coarse powder Size: pa le catechu comes in the form of cubes orrectangular blocks of 2 to 4 cm length Shape: R egular cubes or as rectangular blocks. .

10. Chemical constituents Reddish brown coloured , Condensed tannins in the form of catechins (7-33%). Catechutannic acid (22-50%), and Catechu red. Contains quercetin and gambier fluorescin .

11. Chemical tests(Gambier Fluorescin test) Alcoholic extract of Gambier 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

12. Therapeutic uses Used as Astringent. Source of tannic acid Used in Leather & Fabric industry Used in dyeing industry

13. Thank You 🙏