Class (59) = Tannin (Part 04) | Chemical Identification Test of Tannin | Qualitative Test of Tannin
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- Опубліковано 8 вер 2024
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1. Introduction to Tannin by Solution Pharmacy in Hindi • Class (56) = Tannin (P...
2. Properties of Tannin (Physical and Chemical) by Solution Pharmacy in Hindi • Class (57) = Tannin (P...
3. Classification of Tannin by Solution Pharmacy in Hindi • Class (58) = Tannin (P...
Tannins are naturally occurring complex organic compounds possessing nitrogen free polyphenols of high molecular weight. They form colloidal solution with water giving acid reactions. They also precipitate proteins and alkaloids. The astringent in nature of tannins is due to the fact that they can precipitate proteins and render them resistant to enzymatic attack. When applied on a wound or injury, tannins form a protective coating so as to prevent external irritation and thus promote healing.
Chemical tests:
1. Gelatin test:
To a solution of tannin, aqueous solution of gelatin and sodium chloride are added. A white buff coloured precipitate is formed.
2. Goldbeater’s skin test:
A small piece of goldbeater skin (membrane prepared from the intestine of an ox) is soaked in 20% hydrochloric acid, ringed with distilled water and placed in a solution of tannin for 5 minutes. The skin piece is washed with distilled water and kept in a solution of ferrous sulphate. A brown or black colour is produced on the skin due presence of tannins.
3. Phenazone test:
A mixture of aqueous extract of a drug and sodium acid phosphate is heated and cooled and filtered. A solution of phenazone is added to the filtrate. A bulky coloured precipitate is formed.
4. Match stick test (Catechin test):
A match stick is dipped in aqueous plant extract, dried near burner and moistened with concentrated hydrochloric acid. On warming near flame, the matchstick wood turns pink or red due to formation of phloroglucinol.
5. Chlorogenic acid test:
An extract of chlorogenic acid containing drug is treated with aqueous ammonia. A green colour is formed on exposure to air.
6. Vanillin-hydrochloric acid test:
Sample solution and added vanillin- hydrochloric acid reagent (Vanillin 1 gm, alcohol 10 ml, concentrated hydrochloric acid 10 ml). A pink or red colour is formed due to formation of phloroglucinol.
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Mam Jo information Maine poore b pharmacy m knowledge gain NAi kiya jitna aapko vedios dekh Kar kiya
Thank u mam u r inspiration
For all of us student who want study pharmacy
But can't take admission.
Thank u mam keep educating us
Thank you so much- Admin solutuon.
Nice informative vdo as always keep sharing more ,i have seen almost all of your vdos
Mam thanku so much for the great teaching I had learnt and watch ur all lecture and I got 14 out of 20 in 3rd mid sem examination.
Thanku all of this beacuse of you.
Pls make more vedio related to pharmacognosy and pharmacology.🙂🙂again thanku mam.
Thank you. She is making cognosy and i am making cology video.
@@solutionpharmacy yes sir u both are great teachers.
Darji Rushi Thank you
Pls mam upload volatil oil's properties,classification and identification test.
Also about resin secondary metabolite.
Really very useful video
Your explanation is impressive
I got so many information from your videos
Thanks
Thank you
Thank you ma'am
Bahut Bahut dhanybad mam aapka
Thanks man
Thanks mam 💜
Mam ap se puch na hay b pharama bhot taff or me Hindi mideyam se hu Kya me kr skti hu
This reply is by admin not by madam- Its not that tough. Hum bhi hindi medium se hi the
💖
Mam what is phloroglucinal
could you please tell me which book to be reffer for pharmacognosy? though I've kokate june2009 edition but I don't like it.
you can also refer Pharmacognosy and Phytochemistry by Birendra shah and A.K.seth, Trease and Evans
Jo aap log Kar rahe vo Koi nai karega ..
Is this of semester 4 or 5?
This is for B.Pharm sem 4 and also for D.pharm
Thank you ma'am