Multivariate Determination of Sugar Powders by Attenuated Total Reflectance Infrared Spectroscopy

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Thanks to what has been achieved by Fourier transformation, infrared analysis can now become a state-of-the-art device in quality control laboratories if we consider its precision and the gain in time it ensures. Moreover, an increasing number of new mathematical regression methods such as partial least-squares (PLS) regression allow multicomponent quantitative analysis in mixtures. Nevertheless, the efficiency of infrared spectrometry as a quantitative analytical method often depends on the choice of an adequate presentation for the sample. For quantitative analysis of powders, sampling appears difficult in the mid-IR. We have developed a method built on three advantages: the rapidity of Fourier transform spectroscopy, fast solvent elimination, and good peak resolution. For enhancing peak intensity on attenuated total reflectance (ATR) spectroscopy we use nondissolving and evaporating liquids. For instance, the analysis of three components (glucose, fructose, and sucrose) can be done with a precision in the range of 4%, whereas the time required to obtain an analysis report is about 5 min.

Keywords: ATR spectroscopy; Analytical methods; Computer applications; Infrared; Partial least-squares

Document Type: Research Article


Affiliations: 1: LASIR (UPR A 2631 CNRS), Université des Sciences et Techniques, de Lille, Bat C5, 59655 Villeneuve d'Ascq Cedex, France 2: AGRO/BNUT/NIR-Université Catholique de Louvain, Place Croix du sud, 2/8, 1348 Louvain-la-Neuve, Belgium

Publication date: April 1, 1993

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