نتایج جستجو برای: chemometric methods

تعداد نتایج: 1875779  

2013
Ana M. Aguilera Manuel Escabias Mariano J. Valderrama M. Carmen Aguilera-Morillo

The objective of this paper is to present a review of different calibration and classification methods for functional data in the context of chemometric applications. In chemometric, it is usual to measure certain parameters in terms of a set of spectrometric curves that are observed in a finite set of points (functional data). Although the predictor variable is clearly functional, this problem...

2015
Amira H Kamal Mokhtar M Mabrouk Hamed M El-Fatatry Sherin F Hammad

New chemometric approaches were applied to high performance liquid chromatography (HPLC) for simultaneous determination of esomeprazole magenisum trihydrate and naproxen in their synthetic mixture. These chemometric approaches were applied to the multiwavelength HPLC peak area ratio obtained by plotting the chromatograms at the five wavelengths using diclofenac sodium as internal standard (IS)....

2004
Roma Tauler Emma Peré-Trepat Silvia Lacorte

Environmental monitoring studies produce huge amounts of concentration values of chemicals spread at distant geographical sites and during different time periods. Moreover, the content of chemicals is also estimated at different environmental compartments (i.e. air, water, sediments, biota...). All these data values are difficult to cope and evaluate in a simple and fast way using simple univar...

Journal: :Phytochemical analysis : PCA 2013
Haidy A Gad Sherweit H El-Ahmady Mohamed I Abou-Shoer Mohamed M Al-Azizi

INTRODUCTION Herbal medicines (HM) and their preparations have been widely used for hundreds of years all over the world. However, they have not been officially recognised due to a lack of adequate or accepted research methodology for their evaluation. OBJECTIVE To present a concise overview of the recent applications of chemometrics in solving the ambiguity of herbal medicine authentication ...

2010
M.R. Khoshayand H. Abdollahi A. Ghaffari M. Shariatpanahi H. Farzanegan

BACKGROUND AND THE PURPOSE OF THE STUDY The linear multivariate calibration models such as principal components regression (PCR) and partial least squares regressions (PLS1 and PLS2) due to the mathematical simplicity and physical or chemical interpretability are sufficient and generally preferred method for analysis of multicomponent drugs. In this study, simultaneous determination of paraceta...

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