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Juniper Tar
»Juniper Tar is the empyreumatic volatile oil obtained from the woody portions of Juniperus oxycedrusLinné(Fam.Pinaceae).
Packaging and storage—
Preserve in tight,light-resistant containers,and avoid exposure to excessive heat.
Identification—
Shake 1volume with 20volumes of warm water,filter,and use the filtrate for the following tests.
A:
To 5mLof the cold filtrate add a few drops of silver-ammonium nitrate TS:a black color is produced.
B:
To 5mLof the filtrate add a few drops of alkaline cupric tartrate TS,and heat the solution to boiling:a red precipitate is formed.
Specific gravity á841ñ:
between 0.950and 1.055.
Reaction—
The filtrate prepared for the Identificationtests is acid to litmus.
Rosin or rosin oils—
Triturate 1mLof it with 15mLof solvent hexane,filter the solution,add an equal volume of cupric acetate solution (1in 100),shake vigorously,and allow the liquids to separate.Decant the solvent hexane layer into a test tube,and add an equal volume of ether:the liquid does not become dark green or blackish.
Auxiliary Information—
Staff Liaison:Catherine Sheehan,B.Sc.,Scientist
Expert Committee:(EMC)Excipients:Monograph Content
USP28–NF23Page 1094
Phone Number:1-301-816-8262
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