Hptlc determination of rabeprazole and domperidone

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Hptlc determination of rabeprazole and domperidone

Posted Apr 27, 2016 by Admin

In this way, Krystek 5 proposes two methods of preliminary selection of wavelengths which may meet the requirements for the analytical wavelengths, whose proposed names are: the method of disturbing effect and the method of sixteen solutions.Simultaneous high-performance liquid chromatographic determination of atenolol and amlodipine in pharmaceutical-dosage form Page No: 274-279 By: Ranjan Kumar. In this work, the analytical applications of derivative UV/VIS region absorption spectrophotometry produced in the last 3 years (since 2009) are reviewed. Highlights DS opens up possibilities for increasing selectivity and sensitivity.

The optimized models were compared by application to the analysis of synthetic mixtures and commercial pharmaceutical formulations, in order to establish their reliability in terms of accuracy and precision. According to these studies, multivariate calibration methods (PCR, PLS-1, PLS-2) coupled with derivative spectral data can.Fig. 2. Fig. 2. Evolution of DS publications from 1980 until today. 2. Theoretical and instrumental aspects The determination of the analytical wavelength (the wavelength at which the binary system is analyzed by DS) involves the analysis of the derivative spectra.

However, this method, referred to as the zero-crossing technique, sometimes requires the analysis of the spectrum at many wavelengths. This refers particularly to the spectra with high course variation and high order derivative spectra.In these works, we exposed the different aspects of derivative ultraviolet/visible spectrophotometry: theoretical, instrumental devices and analytical applications, the first until 1986, the second until 1993, the third until 2003 and the fourth until 2008.

The derivative curves are more structured than the original spectra, thus enabling very tiny differences between the original spectra to be identified. DS method has been widely used to enhance the signal and resolve the overlapped peak-signals due to its advantages in differentiating closely adjacent.In this sense, De Luca et al. 6 develop three multivariate procedures, based on PCR, PLS1 and PLS2 algorithms that have been applied on absorbance data of a ternary mixture of drugs.

For this aim, the authors developed a novel mathematical procedure, based on the absolute values of the component regression coefficients. This procedure was compared with the other ones reported in literature, by evaluating the application easiness and the improvement of the predictive ability of the.The purpose of this paper is to review the articles on the anterior cited aspects published since 2009, in order to complete the review since our last publication 4. The great interest of this technique can be demonstrated from the increasing number of paper that.

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DS is used to determine elements with high accuracy without any previous step. DS is very useful when overlap or interference exists. DS offers a powerful tool for qualitative and quantitative analyses of mixtures.The intersection points of the four curves representing the same concentrations of one component and different concentrations of the other may represent the analytical wavelengths for the first component. The combined use of DS and chemometric techniques has demonstrated to be a highly convenient choice.

This approach is simple in application, inexpensive, requires an easy treatment of the samples and provides reliable analytical results.Currently, the determination of the measuring points is easier only in the ratio spectra derivative method, which does not make use of the zero crossing technique for the reading of the derivative value.

They are presented using, as example, 2,4-dichlorophenoxyacetic acid (2,4D 2-(4-Chloro-2-methylphenoxy)propionic acid (MCPP and 2-(2,4-Dichlorophenoxy)propionic acid (2,4DP which have very similar but, at the same time, very complex spectra. 2.1. Method of disturbing effect Derivative spectra were recorded for a series of solutions where the concentration.Keywords Derivative UVvis; Multi-component analysis; Pharmaceutical analysis; Metal ion analysis; Review 1. Introduction Application of derivative technique of spectrophotometry offers a powerful tool for quantitative analysis of multi-component mixtures. When derivatised, the maxima and minima of the original function take zero values, and the inflections.

In general, DS has been directly used for the simultaneous determination of organic and inorganic compounds. Fig. 1 shows the applications of DS in several areas since last three decades ago. As can be seen from this figure pharmaceutical and inorganic analyses are two areas where.Fig. 1. Application of DS in different areas. DS offers greater selectivity than normal spectrophotometry in the simultaneous determination of two or more components without previous chemical separation. Principles, advantages and applications of this technique have been reviewed in four works published some years ago 1.

The points which are close to the zero line indicate low sensitivity of the determination. The closer the intersection points of the curves, the more precise the determination at these wavelengths.2. Theoretical and instrumental aspects. The determination of the analytical wavelength (the wavelength at which the binary system is analyzed by DS) involves the.

Brazilian Journal of Pharmaceutical Sciences Print version ISSN Braz. J. Pharm. Sci. vol.49 no.1 S o Paulo Jan./Mar. 2013 i.org/10.1590/S1984.2.2. Method of sixteen solutions. It involves preparation of a series of 16 solutions of two analyzed components. In the series, each of the four concentrations of one component corresponds with four different concentrations of the other.

The points at which all the curves intersect are the points which may meet the requirements for the analytical wavelengths. The more distant they are from the zero line, the more sensitive is the method at the given wavelength.Derivative spectrophotometry (DS) has been introduced for the resolution of overlapping peaks. DS method has been widely used to enhance the signal and resolve the overlapped peak-signals due to its advantages in differentiating closely adjacent peaks, and identifying weak peaks obscured by sharp peaks.

Validation of the models was performed by full cross-validation procedure, providing to select the optimal number of factors. In the optimization step, the wavelength regions containing the most useful information were also selected and all the useless signals, due to interferences or noise, were discarded.The main goal of the work was a detailed comparison between the regression methods when they are applied on ordinary or derivative spectral data. The influence of the derivative order from zero to four on the prediction ability of the methods was investigated by the.