Determination of oxytetracycline and its decomposition products in Tetran vulnerary powder.

A simple and fast HPLC method was developed for the determination of oxytetracycline and its decomposition products in pharmaceutical preparations. For this purpose an octadecyl modified silica stationary phase and a terner eluent containing aceto-nitrile-methanol-aqueous oxalic acid/EDTA solution was employed. Using this method, a stability study of oxytetracycline-containing powder was carried out.

Conduction velocity in the proximal sural nerve.

Sensory conduction velocity in the proximal portion of the sural nerve differs significantly from that in the distal portion and is less variable. Its determination should improved the value and accuracy of the electroneurographic examination of this nerve. Antidromic conduction velocities in 3 contiguous nerve segments of 10cm each, were determined in 102 sural nerves in normal subjects.