Peak purity determination with principal component analysis of high-performance liquid chromatography-diode array detection data.
ABSTRACT A method is proposed for the determination of chromatographic peak purity by means of principal component analysis (PCA) of high-performance liquid chromatography with diode array detection (HPLC-DAD) data. The method is exemplified with analysis of binary mixtures of lidocaine and prilocaine with different levels of separation. Lidocaine and prilocaine have very similar spectra and the chromatograms used had substantial peak overlap. The samples analysed contained a constant amount of lidocaine and a minor amount of prilocaine (0.02-2 conc.%) and hence the focus was on determining the purity of the lidocaine peak in the presence of much smaller levels of prilocaine. The peak purity determination was made by examination of relative observation residuals, scores and loadings from the PCA decomposition of DAD data over a chromatographic peak. As a reference method, the functions for peak purity analysis in the chromatographic data system used (Chromeleon) were applied. The PCA method showed good results at the same level as the detection limit of baseline-separated prilocaine, outperforming the methods in Chromeleon by a factor of ten. There is a discussion of the interpretation of the result, with some comparisons with evolving factor analysis (EFA). The main advantage of the PCA method for determination of peak purity over methods like EFA lies in its simplicity, short time of calculation and ease of use.
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ABSTRACT: A new method using high performance liguid chromatography (HPLC) with diode array detection (DAD) was developed and validated for the simultaneous determination of paracetamol (PAR), pseudoephedrine hydrochloride (PSE), and dextromethorphan hydrobromide (DEX) in tablets. The spectrochromatograms of these compounds give the severely overlapping spectrochromatogram. This makes the use of univariate calibration impossible. Therefore, PLS and PCR were used to analyze the three-way data recorded by HPLC-DAD. These multivariate calibration methods were tested by analyzing the synthetic mixtures of PAR, PSE, and DEX. The recoveries were in the range of 96.1–100.2% and 97.1–100.4%, relative error of prediction (REP%) in the range of 0.5–6.7 and 0.8–7.0% were obtained for PLS and PCR, respectively. These methods were also applied to real samples containing the three drugs, and recoveries in the range of 99.0–106.0% and 99.6–106.3% were obtained for PLS and PCR, respectively. The results obtained by PLS and PCR statistically compared with the results obtained by the classical HPLC method. It was found that there were no significant differences between the means and the standard deviations of the results obtained by the multivariate calibration methods and classical method. HPLC-multivariate calibration methods have several advantages over the classical HPLC method. These advantages are the use of a simple mobile phase and shorter analysis time. Also, these methods do not require the internal standard and the gradient elution.Journal of Liquid Chromatography & Related Technologies 10/2011; 34(16):1686-1698. · 0.64 Impact Factor
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ABSTRACT: A simple and sensitive spectrophotometric method was developed for the determination of prilocaine HCl in pharmaceutical preparation and human plasma. The quantitative analysis of prilocaine HCl was carried out using of wavelength at 230 nm. The method was linear in concentration range of 3-15 μg/mL for standard solution and 4-15 μg/mL for human plasma. Linearity was determined by calculating correlation coefficient. These values were found as a 0.9999 and 0.9967 in standard solution and human plasma, respectively. Developed spectrophotometric method was found suitable in terms of accuracy, sensitivity, precision, reproducibility. In addition to these, this method could be easily and directly applied to both human plasma and pharmaceutical preparation. INTRODUCTION: The reason of using local anesthetics is to block the conduction of impulses in nerve fibers which cause anesthesia. They are most commonly used in dentistry and minor surgery in order to provide temporary relief of pain. There are two application types of local anesthetics which are topical and parenteral applications that reversibly block the nerve conductances.
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ABSTRACT: This article presents various important tools of chemometrics utilized as data evaluation tools generated by various hyphenated analytical techniques including their application since its advent to today. The work has been divided into various sections, which include various multivariate regression methods and multivariate resolution methods. Finally the last section deals with the applicability of chemometric tools in analytical chemistry. The main objective of this article is to review the chemometric methods used in analytical chemistry (qualitative/quantitative), to determine the elution sequence, classify various data sets, assess peak purity and estimate the number of chemical components. These reviewed methods further can be used for treating n-way data obtained by hyphenation of LC with multi-channel detectors. We prefer to provide a detailed view of various important methods developed with their algorithm in favor of employing and understanding them by researchers not very familiar with chemometrics.Talanta 01/2014; 123:186–199. · 3.50 Impact Factor
Journal of Chromatography A, 1042 (2004) 225
Erratum to “Peak purity determination with principal component analysis
of high-performance liquid chromatography–diode array detection data”
[J. Chromatogr. A 1029 (2004) 13–20]?
Kent Wiberga,b, Mattias Anderssona, Anders Hagmana, Sven P. Jacobssona,b,∗
aAstraZeneca R&D Södertälje, Analytical Development, Forskargatan 20, SE-151 85 Södertälje, Sweden
bDepartment of Analytical Chemistry, University of Stockholm, SE-106 91 Stockholm, Sweden
Received 7 May 2004; accepted 7 May 2004
Keywords: Principal component analysis; Peak purity determination; Relative observation residuals; Scores; Loadings
Page 15, Fig. 1b should read:
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Fig. 1. Structure and UV spectra of lidocaine and prilocaine: (a) lidocaine and (b) prilocaine.
?doi of original article 10.1016/j.chroma.2003.12.052.
∗Corresponding author. Tel.: +46-8-55328968; fax: +46-8-55327730.
E-mail address: firstname.lastname@example.org (S.P. Jacobsson).
0021-9673/$ – see front matter © 2004 Elsevier B.V. All rights reserved.