Abstract
Summary: A semi-micro method for the determination of procaine in procaine-penicillin and in its suspensions in arachis oil is given. The method is based upon extraction of procaine base with chloroform followed by acidification of the extract and titration with sodium nitrite solution. No interference has been encountered in the presence of low potency penicillin or aluminium monostearate. The author wishes to thank Mr. A. G. Fishburn and Mr. R. T. Parry-Jones for their interest and helpful criticism during this work.

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