Simultaneous determination of amoxicillin and potassium clavulanate antibiotics in pharmacueutical sample using derivative spectrophotometric method

Derivatives spectrophotometric techniques were developed for the determination of Amoxicillin Trihydrate (Amox) with Potassium Clavulanate (PC) antibiotic binary mixtures. The simultaneous determination of these compounds was accomplished by derivative (1D, 2D and 3D) spectrophotometric technique and applying zero-crossing technique used for determination of (Amox) and (PC) in tablets. The second order derivative absorption spectra at valley λ=299 nm were used for (Amox) and also the second order derivative spectra at peak λ=239.5 nm were used for (PC). No interferences were found between both determined constituents and those of matrix. A good accuracy and precision of simultaneous determination of (Amox) and (PC) were confirmed by statistical analysis. The recovery of individual constituents under established conditions is very high and ranges for synthetic standards mixture and tablets from 100.11, 99.33 and 96.98, 96.84 respectively. Linearity is maintained within a wide concentration range from 2.0 to 90.0 μg.mL^-1 and from 10.0 to 90.0 μg.mL^-1 for (Amox) and (PC) and linearity percentage 99.98 and 99.99 respectively. The detection limit is 0.211 μg.mL^-1 for (Amox) and 0.259 μg.mL^-1 for (PC). The corresponding quantitation limits are 0.704 μg.mL^-1 (Amox) and 0.864 μg.mL^-1 for (PC).