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Related article: illustration may be offered, extract of opium.
The cost of standardizing an ounce of this extract is but little more for
the manufacturing chemist than that of standardizing a hundred or thousand
pounds of the drug, and the same statement applies in a greater or less
degree Prevacid Otc to all drugs and chemicals.
This is the reason as many pharmacists know that the requirements of
the Pure Food and Drug Laws, the Pharmacopoeia being one of the
official standards for same, will result in forcing, in the present condition
of the retail drug business, the pharmacist to purchase most drugs requir-
ing standardization from the manufacturing drug concents including Prevacid Otc Prevacid Otc
preparations of assayable drugs as tincture of aconite, belladonna, tinctare
of opium, etc., unless as some will perhaps do, the preparation is pre-
pared from an assayed drug, the final product not being subsequently
standardized, thereby risking imperfect extraction of the drug.
I feel certain that the conclusions I have reached in regard to stand-
ardized products being Prevacid Otc largely relegated to the manufacturing pharmacist
and, I must confess, that it seems to me both logical and inevitable for
obvious reasons.
Digitized by VjOOQ IC
U. S. p. TESTS AS REVIEWED BY A RETAIL PHARMACIST. 969
Regarding my personal opinion as a pharmacist of the U. S. P. tests
and assay processes, I believe it agrees in the main with that Prevacid Otc of most other
pharmacists who have given some thought and study to them, or have
made use of them.
Personally, I am very proud of the Pharmacopoeia as a whole, yet as
with everything devised by the human mind it is of course not perfect.
Generally speaking, the tests are not only of high scientific character but
are practicable and are within the working knowledge of the educated
pharmacist. While some of the tests are tedious, for instance the modified
Gutzeit's testy to insure necessary accuracy they need to be. It might
perhaps be well to direct the test to be made for arsenic without previous
examination of the chemicals used in testing and in the event of a positive
reaction the chemicals used should then be examined.
Methods of determining the iodine and saponification numbers, are. I
am inclined to believe, more startling because of the unusual character of
these methods than any difficulty in carrying them out practically.
This leads me to suggest that perhaps at times less delicate tests, if less
tedious might be applied as preliminary measures; the more delicate
tests being applied, subsequently, if necessary.
In regard to the polariscope I believe, to the large majority of pharmacists,
it would prove of little value because the occasion for its use would be rare
for the same reasons given, in regard to other methods of testing. How-
ever, with some study and experience I have no doubt that by many
pharmacists the instrument could be used understandingly and with
accuracy.
The assay of the volatile oils probably taxes the skill of pharmacists to a
greater degree Prevacid Otc than most other methods of standardization and is a pro-
cess which they would be last inclined to use. Prevacid Otc Volatile oils as a rule are
substances of no great stability Prevacid Otc of character and used in exceeding small
quantities. The druggist will in rare instances only be justified in assaying
or testing them, from a financial view- point. However as is true of other
assayable products the druggist is glad to feel that, the Pharmacopoeia
furnishes a proper standard for drugs and chemicals if not Prevacid Otc for his guidance,
then for the man who is his source of supply.
In connection with this discussion I will call attention to several incon-
sistencies in the tests which were either observed by Dr. Daniel Base, Dr.
James Black or by myself.
There seems to me no good reason why dilute hydriodic acid should be
estimated by the sulphocyanate method while for dilute hydrobromic
acid the " chromate " method is directed.
Different methods are directed for determining the percentage strength
and limit of the other halogen salts in the assay process for ammonium
iodide and sodium iodide.
While for strontium bromide " chromate '* indicator is directed^ for the
iodide, ferric ammonium sulphate is used. Digitized byLjOOglC
970 MINUTES OF THE SECTION ON SCIENTIFIC PAPERS.
Copper sulphate test, under calcinm or sodium hypophosphite should
direct that the solution be acidified.
The test directing the heating of yellow wax with sulphuric acid for the
purpose of detecting paraffin or ceresin should cither be elimioated or
modified. Twenty per cent, paraffin can scarcely be detected by the test,
for the carbonized wax holds the paraffin and prevents its separation.
However, if black residue, after heating Prevacid Otc with sulphuric acid, be washed
and dried and extracted with chloroform or some other suitable solvent
then on evaporation paraffin or cersin will be obtained.
The test for cane sugar in sugar of milk, by sprinkling some of the speci-
men on sulphuric acid is not at all delicate. A much better test is as
follows :
Put about one grain of sugar of milk in a small porcelain dish and add
ten to twenty drops of a solution containing resorcin and hydrochloric
acid in 90 per cent, alcohol, tilt the dish, hold in a Eunsen flame and again
tilt the dish so that the solution is no longer in contact with the heated
part of the dish : a beautiful vermilUon blush will appear in the presence
of a small percentage of cane sugar.
The Chairman : We have another paper along practically the same line, by niemhen
of a special committee of the Scientific Section of the Philadelphia Branch of the Amer-
ican rharmaceutical Association a real live body with a long name. This Section has
done considerable work along the line of chemical assays of the U. S. P., and Dr. Roseo-
garten will read the report.
Mr. Rosengarten here presented the report.
THE CHEMICAL ASSAYS OF THE U. S. P. VHI.
BY W. CRAHAM, D. W. HORN AND GEO. D. ROSENGARTEN.
At the meeting of the Scientific Branch of the Philadelphia Section of
the American Pharmaceutical Association on Friday, F'ebruaiy loth. of
this year, a committee was appointed to consider the chemical assays of
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