To obtain the validation parameters, evaluation of the peak area was employed to determine the level of -lipoic acid. A calibration curve was constructed and treated with linear least square regression analysis. The slope, intercept and correlation coefficient data were also calculated. The limit of detection (LOD) and the limit of quantitation (LOQ) were determined from 3Sbl/S to 10Sbl/S,respectively, where Sbl is the standard deviation of the blank measurement (n = 10) and S is the sensitivity of the method, evaluated as the slope of the linearity. To determine the intra-day and inter-day precision of the analytical process, three concentrations (0.5, 5.0 and 30g/mL) were studied five timesonthesameday andonthree different days, respectively. In addition, the selectivity of the proposed methodology was investigated by observing any interference
encountered from excipients presented in the formulations.