IDENTIFICATIONA. Thin-layer chromatography (2.2.27).Test solution. Dissolve 5 mg of the substance to be examined in methanol R and dilute to 10 ml with the same solvent.Reference solution (a). Dissolve 5 mg of tetracycline hydrochloride CRS in methanol R and dilute to 10 ml with the same solvent.Reference solution (b). Dissolve 5 mg of tetracycline hydrochloride CRS, 5 mg of demeclocycline hydrochloride R and 5 mg of oxytetracycline hydrochloride R in methanol R and dilute to 10 ml with the same solvent.Plate. TLC octadecylsilyl silica gel F254 plate R.Mobile phase. Mix 20 volumes of acetonitrile R, 20 volumes of methanol R and 60 volumes of a 63 g/l solution of oxalic acid R previously adjusted to pH 2 with concentrated ammonia R.Application. 1 µl.
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