CATECHU Synonyms     – Pale catechu, gambier, kattha Biological   source – It consists of the dried aqueous extract prep...
 Chemical    constituents – It    contains   tannins     like   catechins   and catechu tannic acid It    contains flav...
 Uses   – Used   as an astringent Used   in the treatment of diarrhoea Used   in the preparation of lozenges
BLACK CATECHU Biological   source – It   consists of the dried aqueous extract prepared from heart wood of Acacia catech...
 Chemical      constituents – It   contains tannins like catechins and catechu tannic acid It   contains flavonoids lik...
CHEMICAL TESTS FOR CATECHU 1.   Gambir Fluorescin test- Alcoholic    extract of drug, few drops of sodium hydroxide mix ...
 2.   Match stick test ( Catechins test) –A     match stick is dipped in aqueous plant extract , dried near burner and m...
 3.   Vanillin – Hydrochloric acid test – Test    solution and few drops of Vanillin – Hydrochloric acid reagent – A red...
TANNIC ACID Biological   source –   It is obtained from the nutgalls. Galls are vegetable outgrowths found on the young t...
 Uses   – Used   as an astringent Used   externally in the treatment of burns Used   as an antidote for alkaloid poiso...
NUTGALL Synonym      – Turkey galls Biological   source – Galls are the pathological outgrowths formed on           the ...
   QUESTIONS – Define   tannins and explain various methods of estimation    of tannins.10 M Write   a note on general ...
 Write   a note on estimation of Hydrolysable tannins.5M Give    the chemical tests for the identification of Catechu  a...
 Write   in brief about Nut gall. 2M Chemical    tests for the identification of tannins.2M What    is tannic acid and ...
Tannins   drugs by Dr.U.Srinivasa, Professor and Head, Srinivas college of pharmacy, Mangalore
Tannins   drugs by Dr.U.Srinivasa, Professor and Head, Srinivas college of pharmacy, Mangalore
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Tannins drugs by Dr.U.Srinivasa, Professor and Head, Srinivas college of pharmacy, Mangalore

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Tannins drugs by Dr.U.Srinivasa, Professor and Head, Srinivas college of pharmacy, Mangalore

  1. 1. CATECHU Synonyms – Pale catechu, gambier, kattha Biological source – It consists of the dried aqueous extract prepared from the leaves of Uncaria gambier Family - Rubiaceae
  2. 2.  Chemical constituents – It contains tannins like catechins and catechu tannic acid It contains flavonoids like quercetin and fluorescent substances Gambier fluorescein. It also contains catechu- red, pyrogallol, fixed oil and waxes
  3. 3.  Uses – Used as an astringent Used in the treatment of diarrhoea Used in the preparation of lozenges
  4. 4. BLACK CATECHU Biological source – It consists of the dried aqueous extract prepared from heart wood of Acacia catechu and Acacia chundra Family - Leguminosae
  5. 5.  Chemical constituents – It contains tannins like catechins and catechu tannic acid It contains flavonoids like quercetin. Others like Catechu- red and gum Uses – Used as an astringent, used in diarrhoea Used as a cooling and digestive agent
  6. 6. CHEMICAL TESTS FOR CATECHU 1. Gambir Fluorescin test- Alcoholic extract of drug, few drops of sodium hydroxide mix and add petroleum ether, shake and kept aside for few minutes – petroleum ether layer shows green fluorescence ( + ve for pale catechu due Gambir Fluorescin )
  7. 7.  2. Match stick test ( Catechins test) –A match stick is dipped in aqueous plant extract , dried near burner and moistened with Hcl. On warming near flame , the match stick wood turns pink or red due to the formation of phloroglucinol.
  8. 8.  3. Vanillin – Hydrochloric acid test – Test solution and few drops of Vanillin – Hydrochloric acid reagent – A red or pink is formed due the formation of phloroglucinol. 4. Chlorophyll test - Powdered drug is heated with chloroform on a water bath for 1-2 minutes .The organic layer is filtered in a china dish and evaporated on the water bath– green residue
  9. 9. TANNIC ACID Biological source – It is obtained from the nutgalls. Galls are vegetable outgrowths found on the young twigs of Quercus infectoria Family - Fagaceae Tannic acid is a hydrolysable tannin and yields Gallic acid and glucose on hydrolysis
  10. 10.  Uses – Used as an astringent Used externally in the treatment of burns Used as an antidote for alkaloid poisoning
  11. 11. NUTGALL Synonym – Turkey galls Biological source – Galls are the pathological outgrowths formed on the twigs of the oak tree Quercus infectoria Family - Fagaceae Chemical constituents – 40-60% of tannic acid Uses- Used as an astringent, used in the manufacture of tannic acid
  12. 12.  QUESTIONS – Define tannins and explain various methods of estimation of tannins.10 M Write a note on general properties and method of isolation of tannins. 10M Write the source, active constituents and uses of Catechu and Nutgall.5M Explain the different types of tannins with examples.5M Write a note on Goldbeaters’ test and its significances.5M
  13. 13.  Write a note on estimation of Hydrolysable tannins.5M Give the chemical tests for the identification of Catechu and Tannic acid.5M Give an account of Catechu.5M What are tannins? Give general chemical tests to identify them.5M Define Tannins. How will you differentiate True tannins from pseudo tannins ? 5M
  14. 14.  Write in brief about Nut gall. 2M Chemical tests for the identification of tannins.2M What is tannic acid and give its uses.2M Gambir- Flurorescin test and its significances.2M Define Pseudo- tannins and give examples. 2M

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