A borax-chloramphenicol complex in aqueous solution

Green, Cost-Effective Simultaneous Assay of Chloramphenicol, Methylparaben, and Propylparaben in Eye-Drops by Capillary Zone Electrophoresis

A green, cost-effective, and simple capillary zone electrophoresis (CZE) method was developed and validated for simultaneous determination of chloramphenicol, methylparaben, and propylparaben in eye-drops. With sodium tetraborate as background electrolyte (BGE), the apparent mobilities of chloramphenicol, methylparaben, and propylparaben increased and analysis time reduced when pH of BGE increased from 8.5 to 10.0 and concentration of BGE decreased from 40 mM to 15 mM, but complete separation of chloramphenicol from other matrix components was achieved only with sodium tetraborate concentration at 30 mM or higher and at pH = 9.3 or lower. The most suitable electrophoretic conditions for the intended application were a 30 mM sodium tetraborate solution, pH 9.3 as BGE, working voltage set at 25 kV, and UV detection at 280 nm at the cathodic extremity of the capillary. The final method was validated and proved to be reliable for assay of chloramphenicol, methylparaben, and propylparaben in eye-drops.

HPLC determination of chloramphenicol degradation in eye drops

An HPLC-method is described for the simultaneous determination of chloramphenicol and its most important degradation products. A 15 cm long C-18 reversed phase column was used with a mobile phase consisting of boric acid solution-acetonitrile (60 + 45) adjusted to a pH of 3. The amount of degradation of chloramphenicol eye drop solutions containing boric acid and borax, at pH 4.7 and 7.2 respectively, is determined at 4, 21, 100 and 120 degrees C. The solution of pH 7.2 is more stable than that of pH 4.7 at 4 and 21 degrees C, but is less stable at 100 and 120 degrees C. Preparation has to be accomplished in subdued light. The solutions have to be protected from light during storage.