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Bog, hæftet American Journal of Pharmacy, Vol. 73: May, 1901 (Classic Reprint) af Philadelphia College Of Pharmacy

American Journal of Pharmacy, Vol. 73: May, 1901 (Classic Reprint)

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Excerpt from American Journal of Pharmacy, Vol. 73: May, 1901

This drug is very difficult to exhaust completely. After trying several neutral, as well as acid menstrua, the following method was found to work well. Though in this method acid is used, the method can nevertheles... Læs mere

Excerpt from American Journal of Pharmacy, Vol. 73: May, 1901

This drug is very difficult to exhaust completely. After trying several neutral... Læs mere

Produktdetaljer:

Sprog:
Engelsk
ISBN-13:
9781334333842
Sideantal:
76
Udgivet:
01-11-2016
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Excerpt from American Journal of Pharmacy, Vol. 73: May, 1901

This drug is very difficult to exhaust completely. After trying several neutral, as well as acid menstrua, the following method was found to work well. Though in this method acid is used, the method can nevertheless be used as a standard, it being well known that the st'rychnos alkaloids are not easily affected by dilute acids.

Ten grammes of drug in No. 60 powder were moistened in a screw top jar with 5 c.c. Of a menstruum containing 75 per cent. Alcohol and 2 per cent. Phosphoric acid. The jar was then covered and set aside for forty-eight hours. The drug was then put in a small percolator, the jar washed out several times with the same men struum, the washings poured on top of the drug and more of the same menstruum added till the liquid reached the lower orifice (about 23 c.c. Menstruum was used). The percolator was then closed and set aside for twelve hours. The percolation was then continued very slowly with a menstruum containing 75 per cent. Alcohol and about one-quarter of I per cent. Phosphoric acid till about 200 c.c. Were obtained. The first IO c.c. Were received into a 100 c.c. Measuring ¿ask and the rest concentrated in vacuo, first at about 45° C.,and then at ordinary temperature till the percolate was reduced to about 60 c.c. The concentrated extract was then added to the reserved portion, the vessel in which the concentra tion took place washed with water and the whole made up to 100 c.c. This was shaken about one-half hour with talcum powder.

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