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Infrared spectroscopy: a reagent-free method to distinguish Alzheimer's disease patients from normal-aging subjects.

Abstract : The physiopathogenesis of Alzheimer's disease (AD) is related to various biochemical mechanisms that may be reflected by changes in plasma components. In the current study, Fourier transform-infrared (FT-IR) spectroscopy was used to identify these biochemical variations by monitoring spectral differences in the plasma of 40 AD patients compared with those of 112 control subjects. A hierarchical classification in the whole mid-infrared region allowed a clear separation between AD and controls (C) that was optimized by using a restricted spectral range (1480-1428 cm(-1)). Spectral changes confirmed vibration differences between AD and C mostly related to modified lipid and nucleic acid structures involved in oxidative stress-dependent processes of AD. Moreover, the analysis of samples in the 1480-910-cm(-1) region allowed the distinction between C and AD with an accuracy of 98.4% and showed 2 subgroups C(1) and C(2) within the C group. Interestingly, the C(1) subgroup was located closer to the AD group than the C(2) subgroup, which suggests biochemical differences within the nondemented subjects. Biochemical studies revealed a significant increase in a specific marker of oxidative stress, F8-isoprostanes (8-epi-PGF2alpha) levels, in the plasma of AD patients as compared with total controls and subgroup C(2) but not subgroup C(1). Thus, these results suggest that use of FT-IR spectroscopy could be valuable to distinguish AD patients from normal-aging subjects.
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Contributor : Evelyne Mouillet <>
Submitted on : Monday, October 6, 2008 - 4:39:40 PM
Last modification on : Thursday, January 11, 2018 - 6:15:57 AM
Long-term archiving on: : Tuesday, June 28, 2011 - 5:02:52 PM


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Evelyne Peuchant, Sandrine Richard-Harston, Isabelle Bourdel-Marchasson, Jean-François Dartigues, Luc Letenneur, et al.. Infrared spectroscopy: a reagent-free method to distinguish Alzheimer's disease patients from normal-aging subjects.. Translational Research, 2008, 152 (3), pp.103-112. ⟨10.1016/j.trsl.2008.05.009⟩. ⟨inserm-00326947⟩



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