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Determination of Glucose in Dried Serum Samples by Fourier-Transform Infrared Spectroscopy

¹ Faculté des Sciences du Sport et de l'Education Physique, Université Victor Segalen, Bordeaux 2, France.

² Service de Nutrition, Hopital du Haut-Levèque, Bordeaux 33604, France.

³ Laboratoire de Chimie Bio-Organique, INSERM U443, Université Victor Segalen, Bordeaux 2, France.
^a Address correspondence to this author at: Université Victor Segalen, Bordeaux 2, Laboratoire de Chimie Bio-Organique, 146 Rue Léo Saignat, F 33 076, PB 12, Bordeaux, France. Fax 05-57-57-10-02; e-mail gerard.deleris{at}bioorga.u-bordeaux2.fr

Background: Practical improvements are needed to allow measurement of glucose concentrations by Fourier- transform infrared (FT-IR) spectroscopy. We developed a new method that allows determination of the glucose concentration in dried sera.

Methods: We studied 32 serum samples after fourfold dilution and desiccation before FT-IR analyses on a spectrometer operated at a resolution of 2.0 cm^-1. We integrated all spectral windows at the surface of the spectrum in the CO region. For comparison, glucose was measured in the sera by a glucose oxidase method.

Results: One peak within the spectrum was most specific for glucose (997–1062 cm^-1). Its surface integration showed a strong relationship with reference data (r = 0.998; P <0.001). FT-IR analyses of five glucose solutions were performed to determine its specific absorption at the same peak. In this way, glucose concentrations in serum spectra could be measured. For the first time while using FT-IR spectroscopy, no manipulation of spectra nor use of internal standard was necessary to obtain results in high accordance with glucose concentration measured by a conventional (glucose-oxidase) method (S_y|x = 0.25 mmol/L; r = 0.998).

Conclusions: FT-IR spectroscopy appears to be an easy and accurate method to determine glucose concentration and could be widely used to simultaneously identify and quantify several metabolites in biological fluids or tissues.

The following articles in journals at HighWire Press have cited this article:

				C. Petibois, A. Cassaigne, H. Gin, and G. Deleris Lipid Profile Disorders Induced by Long-Term Cessation of Physical Activity in Previously Highly Endurance-Trained Subjects J. Clin. Endocrinol. Metab., July 1, 2004; 89(7): 3377 - 3384. [Abstract] [Full Text] [PDF]

				C. Petibois, G. Cazorla, A. Cassaigne, and G. Deleris Plasma Protein Contents Determined by Fourier-Transform Infrared Spectrometry Clin. Chem., April 1, 2001; 47(4): 730 - 738. [Abstract] [Full Text] [PDF]