Development and Validation of a Stability-Indicating LC Method for Determination of Bexarotene in Softgel Dosage Formulation

QbD based development of HPLC method for simultaneous quantification of Telmisartan and Hydrochlorothiazide impurities in tablets dosage form

A simple reverse phase liquid chromatographic gradient method has been developed and validated for the simultaneous determination of specified & un-specified impurities of Telmisartan and Hydrochlorothiazide in combination oral solid dosage forms. The developed method is effective to separate a total of sixteen (16) peaks and quantify eleven (11) specified impurities of Telmisartan and three (3) specified impurities of Hydrochlorothiazide with a minimum chromatographic resolution of 2.5. The separation was acquired with Inertsil ODS-3V, 150 ​× ​4.6 ​mm, 3.5 ​μm column at a flow rate of 1.0 mL min^-1 with the mobile phase-A consists of 0.02 ​M potassium dihydrogen phosphate (pH of 3.5) and mobile phase-B consists of a mixture of Milli-Q water and acetonitrile (100: 900 v/v) respectively. The detection of impurities was carried out at 230 ​nm and column temperature was maintained at 40 ​°C. Further optimized chromatographic conditions were applied to design of experiments to find out the critical quality attributes and established the design space. The binary combination of drug product was subjected to the different stress conditions such as acid, base, oxidation, heat and photolysis as per the recommendations of international conference on harmonization (Q2). The degradation Product found in stress patterns are well separated among main analyte compounds. The method was validated to be specific, robust and rugged in terms of change of chromatographic, instrumental and technical variables.

A novel RP-HPLC refractive index detector method development and validation for determination of trace-level alcohols (un-sulfated) in sodium lauryl sulfate raw material

The main aim of the study is to develop and validate a simple and rapid liquid chromatographic analytical method for simultaneous determination of trace level of un-sulfated alcohol impurities in sodium lauryl sulfate using high-performance liquid chromatography with a refractive index detector. The chromatographic separation was achieved using flow rate of 3.0 ml/min with a Waters Symmetry C₁₈ (150 × 4.6 mm, 5 μm) column and 50°C as a column temperature. The mobile phase comprised milliQ water and acetonitrile in the ratio of 30:70 v/v respectively. The detection was performed using a refractive index detector at a sensitivity of 64. The resolutions among n-decanol, n-dodecanol, n-tetradecanol, n-hexadecanol, and n-heptadecanol were found to be >4. Regression analysis showed a correlation coefficient for the stated compounds of >0.999. The validated HPLC method was utilized effectively for the estimation of un-sulfated alcohols in quality control labs for commercial release of sodium lauryl sulfate.