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A facile, accurate, sensitive and validated spectrophotometric methods for   the determination of sumatriptan succinate (SMT) in pure and in dosage forms   are described. The methods are based on the formation of charge transfer   products between SMT and chromogenic reagents 2,3-dichloro-5,6   dicyano-p-benzoquinone (DDQ), 7,7,8,8-tetracyanoquinodimethane(TCNQ),   quinalizarin (Quiz) and alizarin red S (ARS) producing charge transfer   complexes which showed an absorption maximum at 461, 841, 567 and 529 nm for   DDQ, TCNQ, Quiz and ARS, respectively. The optimization of the reaction   conditions such as the type of solvent, reagent concentration and reaction   time were investigated. Beer’s law is obeyed in the concentration ranges   1.0-80 mg mL-1. The molar absorptivity, Sandell sensitivity, detection and   quantification limits are also calculated. The correlation coefficient was   ≥0.9994 with a relative standard deviation (R.S.D.) of ≤ 1.08. The proposed   methods were successfully applied for determination of sumatriptan in tablets   with good accuracy and precision and without interferences from common   additives by applying the standard addition technique. Developed methods have   been validated statistically for their accuracy, precision, sensitivity,   selectivity, robustness and ruggedness as per ICH guidelines and the results   compared favourably with those obtained using the reported method

Spectrophotometric study on the charge transfer complex between sumatriptan succinate and some π-acceptors and alizarin derivatives