New Assay Methods for Tetracycline Drug Products

Thermo Fisher Scientific is pleased to announce highperformance liquid chromatography (HPLC) and ultra HPLC (UHPLC) methods that can be used to assay tetracycline (TC) and 4- epianhydrotetracycline (EATC) in a  TC-hydrochloride (HCl) capsule. Application Note 288: New HPLC and UHPLC Assay Methods for Tetracycline  Hydrochloride and 4-Epianhydrotetracycline Hydrochloride Impurity in Tetracycline Drug Products demonstrates
that the results from both methods meet or exceed the criteria in the appropriate United States Pharmacopeia (USP) monographs. Both methods are faster and show higher resolution than the current methods. They also generate less waste and use less hazardous organic solvents. These methods may be applicable to other TC-HCl-containing drug products.

These new assay methods use Thermo Scientific Acclaim™ Polar Advantage II (PA2) reversed-phase columns. The HPLC method uses a 4.6 x 150mm column packed with a 3μm resin and an acetonitrile/ammonium dihydrogen orthophosphate pH 2.2 mobile phase. The Acclaim PA2 column is made with high-purity spherical silica and, unlike a standard C8 column, can be used in a pH range of 1.5–10.