Infrared spectroscopic characterisation of multiple sclerosis plaques in the human central nervous system.

Fourier transform infrared spectroscopy has been used for the characterisation of white matter, grey matter and multiple sclerosis plaques from human central nervous system tissue. We demonstrate significant differences in the infrared spectra of the three types of tissue, which show that an infrared spectroscopic discrimination of multiple sclerosis plaques from healthy brain tissue is possible in principle. The spectral changes reveal pronounced lipid loss in plaques, consistent with the demyelinating nature of the disease. The chronic plaques studied here can also be distinguished from other non-myelinated areas of the brain, based on differences in water content.