A comparison of matrix resolution method, ratio spectra derivative spectrophotometry and HPLC method for the determination of thiamine HCl and pyridoxine HCl in pharmaceutical preparation

A comparison of two spectrophotometric methods and a HPLC method were descr ibed in this work for the analysis of pyridoxine hydrochloride and thiamine hydrochloride in a vitamin combination. In the first method, A(I)(I) (1%, 1 cm) values of these two compounds were calculated using absorbances measu red at 246.8 and 290.5 nm in zero-order spectra. The matrix was written for A(I)(I) (1%, 1 cm) values and the concentration of both compounds were det ermined using 'Matlab' software. In the second method, the measurements in the derivative of the ratio spectra were made at 297.8 and 309.5 nm for pyr idoxine hydrochloride and at 245.6 and 257.7 nm for thiamine hydrochloride. The calibration graphs were established in the range 8-40 mu g/ml of both vitamins. In the HPLC method, the separation of these compounds was realize d on a Nucleosil 100-5 C-18 column with 0.1 M (NH4)(2)CO3-water-methanol (5 :15:80 v/v) as the mobile phase. Results of spectrophotometric and HPLC pro cedures were compared. (C) 2000 Elsevier Science B.V. All rights reserved.