Manipulating ratio spectra for the spectrophotometric analysis of diclofenac sodium and pantoprazole sodium in laboratory mixtures and tablet formulation.
OBJECTIVE
Three sensitive, selective, and precise spectrophotometric methods based on manipulation of ratio spectra, have been developed and validated for the determination of diclofenac sodium and pantoprazole sodium.


METHODS
The first method is based on ratio spectra peak to peak measurement using the amplitudes at 251 and 318 nm; the second method involves the first derivative of the ratio spectra (Δλ = 4 nm) using the peak amplitudes at 326.0 nm for diclofenac sodium and 337.0 nm for pantoprazole sodium. The third is the method of mean centering of ratio spectra using the values at 318.0 nm for both the analytes.


RESULTS
All the three methods were linear over the concentration range of 2.0-24.0  μ g/mL for diclofenac sodium and 2.0-20.0 μg/mL for pantoprazole sodium. The methods were validated according to the ICH guidelines and accuracy, precision, repeatability, and robustness are found to be within the acceptable limit. The results of single factor ANOVA analysis indicated that there is no significant difference among the developed methods.


CONCLUSIONS
The developed methods provided simple resolution of this binary combination from laboratory mixtures and pharmaceutical preparations and can be conveniently adopted for routine quality control analysis.
Department of Chemistry, School of Sciences, Gujarat University, Ahmedabad, Gujarat 380009, Gujarat, India.
Nejal M
NM
Bhatt
Department of Chemistry, School of Sciences, Gujarat University, Ahmedabad, Gujarat 380009, Gujarat, India.
Vijay D
VD
Chavada
Department of Chemistry, St. Xavier's College, Navrangpura, Ahmedabad, Gujarat 380009, Gujarat, India.
Mallika
M
Sanyal
Department of Chemistry, School of Sciences, Gujarat University, Ahmedabad, Gujarat 380009, Gujarat, India.
Pranav S
PS
Shrivastav
D053799:2-Pyridinylmethylsulfinylbenzimidazoles / Q000032:analysis*; D000704:Analysis of Variance; D002138:Calibration; D002626:Chemistry, Pharmaceutical / Q000379:methods; D004008:Diclofenac / Q000032:analysis*; D000077402:Pantoprazole; D015203:Reproducibility of Results; D013053:Spectrophotometry / Q000379:methods*; D013607:Tablets / Q000032:analysis
D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D013607:Tablets; D004008:Diclofenac; D000077402:Pantoprazole