A SIMPLE AND RAPID HPLC METHOD FOR ESTIMATION OF DIMETHICONE FROM FORMULATIONS

A simple, sensitive, precise and specific normal phase high performance liquid chromatography (HPLC) method was developed and validated for the determination of dimethicone from tablet dosage forms. It was found that the excipients used in the tablet dosage form did not interfere in the quantification of dimethicone. The HPLC separation was carried out by normal phase chromatography on Princeton Sphere Cyano, 250 x 4.6mm, 5µ with a mobile phase composed of hexane : ethanol : ethyl acetate (80:20:0.2) in isocratic mode at a flow rate of 0.5mL/min. Dimethicone was quantified using a refractive index detector. The calibration curve for dimethicone was linear from 1.75 to 3.25 mg/mL. The inter-day and intra-day precisions were found to be within limits. The proposed method has adequate sensitivity, reproducibility and specificity for the determination of dimethicone from tablet dosage forms.