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Tannic Acid: Powdered Galls Extracted with Ether (Pelouze, Pharmacopoeia Form)
Tannic acid (gallotannin) is richest in oak galls: the best, Aleppo galls, hold 50–60 %. This is Pelouze's method in the form the British and United States pharmacopoeias adopted, as given in Thorpe's Dictionary (1913): powdered galls are first kept in moist air, then extracted with ether. The liquid splits into two layers; the lower one is a strong solution of tannic acid that dries to a porous mass. No amounts are given. Ether is very flammable: no flame, fume hood.
The picture: our diagram.
中级
2 days
说明
1
1
Powder the galls and let them take up moisture
Powder the galls and let them take up moisture
Grind oak galls finely. Leave the powder for some time in a moist atmosphere before extracting. Ours: a mortar, then a covered tray with a damp cloth.
此步骤所需材料：
五倍子（栎瘿）1 as required所需工具：
石制研钵与研杵
铺湿布的托盘2
2
Extract with ether
Extract with ether
Extract the powder with commercial ether. Ours: shake in a stoppered bottle in a fume hood, away from any flame.
所需工具：
乙醚
带塞玻璃瓶
通风柜（带排风管）
化学防溅护目镜
橡胶手套3
3
Separate the two layers
Separate the two layers
The extract separates into two layers. The upper is ether with gallic acid, wax and resins; the lower is a strong solution of tannic acid. Keep the lower layer. Ours: a separatory funnel.
所需工具：
带活塞的分液漏斗通风柜（带排风管）4
4
Evaporate to a porous mass
Evaporate to a porous mass
Evaporate the lower layer; the tannic acid remains as a porous mass. Ours: an evaporating dish on a water bath, no open flame.
所需工具：
蒸发皿
水浴通风柜（带排风管）此蓝图制作
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