Optimization of levofloxacin analysis by RP-HPLC using multivariate calibration technique

A rapid and sensitive reverse phase high performance liquid chromatographic [RP-HPLC] method for the analysis of levofloxacin from bulk materials, dosage formulations and human serum is described. This isocratic method employs, a Nucleosil, C18 [10um, 25 cm x 0.46 cm] column with a mobile phase of water and acetonitrile [6:5], where in phosphoric acid was used to adjust the pH to 2.9 and propylparaben as an internal standard. Optimization of levofloxacin analysis was carried out using multivariate calibration technique and detector response was recorded at five different wave lengths. A linear response [r > 0.9999] was observed in the range of 40 to 10000 ng ml-1. The method shows good recoveries, intra and inter-day relative standard deviations were less than 1.2%. Validation parameters as specificity, accuracy and robustness were also determined. The method can conveniently be used for analysis of levofloxacin pharmacokinetic levels in human serum and pharmaceutical formulations

Spectrophotometric methods for the simultaneous analysis of meclizine hydrochloride and pyridoxine hydrochloride in bulk drug and pharmaceutical formulations

Three new spectrophotometric procedures for the simultaneous determination of pyridoxine hydrochloride and meclezine hydrochloride are described. The first method depends on the application of simultaneous equation to resolve the interference due to spectral overlapping. The analytical signals were measured at 231 and 220 nm. Calibration graphs were established for 1 to 20 micro GmL-1 for pyridoxine hydrochloride and 0.5 to 10 micro GmL-1 for meclezine hydrochloride in binary mixture. In the second method, the determination of pyridoxine hydrochloride and meclezine hydrochloride was performed by measuring the absorbances at 290 and 235 nm in the simple absorbance spectra of their mixture. In third method a yellowish orange complex of pyridoxine hydrochloride was formed with ferric chloride, which absorbs in the visible region with

In vitro hypoglycemic activity of methanolic extract of some indigenous plants

Pakistan is rich in medicinally important plants and has ancient herbal treatment methods. Present work is based on the study of six indigenous plants Eugenia jambolana, Lawsonia inermis, Momordica charantia, Morus alba, Nigella sativa and Trigonella foenum graecum which show the inhibitory effect of glucose utilization, and are in use as hypoglycemic agents of varying degree in traditional system of medicine. The glucose uptake activity of [methanolic extracts] of these plants was tested in vitro and glucose was estimated by glucose oxidase method. The results in three different media revealed that, hypoglycemic activity is more prominent in neutral and basic media as compared to acidic medium

Quantitation of buclizine hydrochloride in pharmaceutical formulations and human serum by RP-HPLC

An isocratic reversed phase high-performance liquid chromatographic [HPLC] method with ultraviolet detection at 230 nm has been developed for the determination of buclizine hydrochloride in human serum and dosage formulation. Methylparaben was successfully used as an internal standard. Good chromatographic separation between buclizine and internal standard peaks was achieved by using a stainless steel analytical column Nucleosil, C18 [10?m, 25 cm x 0.46 cm]. The system was operated at room temperature using a mobile phase consisting of acetonitrile-water [1:1] [pH 2.6] with phosphoric acid 85% at a flow rate of 2 ml/min. The calibration curve for buclizine hydrochloride in human serum was linear over the tested concentration range of 10, 3, 1.5, 0.5, 0.15, 0.05, and 0.025 mg/ml with a correlation coefficient of 0.9999. The intra- and inter-run precision and accuracy results were 98.07 to 100.34. The proposed method was validated for selectivity, linearity, accuracy, and precision. The method was found to be suitable for the quality control of buclizine hydrochloride in bulk drug as well as in human serum

new RP-HPLC method for analysis of mebeverine hydrochloride in raw materials and tablets

A simple, sensitive, selective, reliable, least time consuming and rapid high-performance liquid chromatographic method for the determination and quantification of meheverine hydrochloride using hyoscine butylbromide as internal standard has been developed. The chromatographic system consisted of a Shimadzu LC-10 AT VP pump, SPD-10 AV VP UV visible detector, and a CBM-102 Bus Module integrator. Separation was achieved on the micro Bondapak 125 a C18 10 micro l column at room temperature. The samples were introduced through an injector valve with a 10 micro l sample loop. Acetonitrile-water [1:1 v/v] was used as mobile phase, with flow rate 1.7 ml/minutes. pH was adjusted to 2.9 with phosphoric acid. U.V detection was performed at 205 nm. The results obtained showed a good agreement with the declared content. Recovery values of mebeverine hydrochloride were from 99.80% to 100.13%. The proposed method is rapid, accurate, and selective and may be used for the quantitative analysis of mebeverine hydrochloride. The method was found to be specific, accurate, precise and reliable for the determination and quantification of mebeverine hydrochloride in form of raw materials, in bulk drugs and formulation. It was possible to determine all of them in the concentration range of 5-30 nano grams. The detection limit of mebeverine hydrochloride was 0.4-nano gram

Determination and quantification of cetirizine HCL in dosage formulations by RP-HPLC

A simple, sensitive, reliable and rapid HPLC method for the determination of cetirizine hydrochloride using hyoscine butyl bromide as an internal standard has been developed. The chromatographic system consisted of Shimadzu LC-10 AT VP pump, SPD-10 AV VP with UV/visible detector and a CBM-102 Bus Module integrator. Separation was achieved on the U Bondapak 125 A C18 10um column at room temperature. The samples were introduced through an injector valve with a 10 ul sample loop. Acetonitrile-water [1:1 v/v] was used as mobile phase, with flow rate 2 ml/minutes. pH was adjusted to 2.9 with phosphoric acid. UV detection was performed at 205 nm. The results obtained showed a good agreement with the declared content. Recovery values for cetirizine hydrochloride were 99.19 - 100.82%. The proposed method is reliable rapid, precise, selective and may be used for the quantitative analysis of cetirizine HCl, in presence of hyoscine butyl bromide as internal standard. The method was valid was for the determination in raw materials, bulk drug and formulations. The limit of quantification was 5 - 30 nano grams, while the limit of detection was 0.4 nano grams