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Tannic Acid: Galls Stirred to a Cream with Ether and Pressed (Leconnet)
Charlie

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Charlie

21. uMfumfu 2026DE
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Tannic Acid: Galls Stirred to a Cream with Ether and Pressed (Leconnet)

Leconnet's method (Annalen, 1836), as Thorpe's Dictionary (1913) gives it: stir powdered galls into ether until a thin cream forms, press it, and repeat until no more tannin comes out. Thorpe does not say how the pressed liquid is worked up; evaporating it is ours. Ether is very flammable: no flame, fume hood. The picture: our diagram.
Ophakathi
1 day

Imiyalelo

1

Stir powdered galls into ether to a thin cream

Grind oak galls finely and stir the powder into ether until the mixture is a thin cream. Ours: a mortar, then a stirrer in a fume hood, no flame.

Izinto zokwakha zalesi sinyathelo:

Ama-gall omuthi wom-oakAma-gall omuthi wom-oak1 as required

Amathuluzi adingekayo:

I-diethyl etherI-diethyl ether
Isigqulo Nomgqulo WetsheIsigqulo Nomgqulo Wetshe
IsigovuziIsigovuzi
Ikhabethe lomusi (elinepayipi)Ikhabethe lomusi (elinepayipi)
Izibuko Zokuchitheka KwamakhemikhaliIzibuko Zokuchitheka Kwamakhemikhali
Amagilavu erabhaAmagilavu erabha
2

Press, and repeat

Press the cream to drive out the liquid. Stir the pressed cake into fresh ether and press again; repeat until no more tannin is removed. Ours: a cloth screw press with filter cloth.

Amathuluzi adingekayo:

Umshini wesikulufu wokucindezela indwanguUmshini wesikulufu wokucindezela indwangu
Indwangu yokuhluza kakotini encaneIndwangu yokuhluza kakotini encane
I-diethyl etherI-diethyl ether
Ikhabethe lomusi (elinepayipi)Ikhabethe lomusi (elinepayipi)
3

Evaporate the pressed liquid (ours)

Thorpe gives no work-up. Ours: evaporate the pressed liquid in a dish on a water bath, no flame, to leave the tannic acid.

Amathuluzi adingekayo:

Ipuleti LokuhwamukaIpuleti Lokuhwamuka
Ibhavu LamanziIbhavu Lamanzi
Ikhabethe lomusi (elinepayipi)Ikhabethe lomusi (elinepayipi)

Izinto

1

Amathuluzi Adingekayo

10

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Tannic Acid: Powdered Galls Extracted with Ether (Pelouze, Pharmacopoeia Form)

Tannic Acid: Powdered Galls Extracted with Ether (Pelouze, Pharmacopoeia Form)

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