C.Rambabu

A simple, accurate, cost effective and reproducible UV-Spectrophotometric method has been developed and validated for the estimation of voriconazole in pure and dosage forms. The present UV-spectrophotometric method is based on measurement of absorption at maximum wavelength of 256nm. The Beer’s law of this method was obeyed in the concentration range of 5-30μg/ml with the linear equation of Y = 0.0218x - 0.0029 and correlation coefficient of 0.9996. The percentage recovery of voriconazole ranged from (99.96) in pharmaceutical dosage forms.

An isocratic reversed phase stability-indicating reverse phase high-performance liquid chromatographic (HPLC) assay method have been developed and validated for the determination of pentoxifylline in bulk drugs. Separation of pentoxifylline from the degradation products was carried out using an Inertsil ODS C18 (250cm x 4.6)mm,5u column  with  mobile phase consisting a mixture of  acetonitrile  and  KH2PO4 buffer (pH 4.0) in the ratio of (60:40v/v). The detection was carried out at wavelength 275nm. The developed method was validated with respect to linearity, accuracy (recovery), precision, system suitability, selectivity prove the stability indicating ability of the method.

Two simple, sensitive selective accurate and economical spectrophotometric methods (Method-A&B) for the determination of Nateglinide in bulk drug and pharmaceutical formulations (tablets) have been described in the present work. Method - A is based on the formation of orange red colored ion-association complex between Nateglinide and Tropaeolineooo (TPooo) exhibiting absorption maximum at 470nm and obeying Beer’s law in the concentration range of 2.5-12.5µg/ml. The Method - B is based on the formation of Ion-association complex between Nateglinide and Alizarine Red S (ARS) to yield an yellow colored chromogen exhibiting absorption maximum at 440nm (Method B) and obeying Beer’s law in the concentration range of 2.5-12.5µg/ml. Statistical analysis of the results has been carried out for the proposed methods revealing high accuracy and good precision. The proposed methods developed by the author could be successfully extended to the commercial pharmaceutical formulations (tablets) containing Nateglinide.