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Characterization of lipid extracts from brain tissue and tumors using Raman spectroscopy and mass spectrometry

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Abstract

Brain tissue is characterized by high lipid content. The amount of lipids decreases, and its composition changes in the most frequent primary brain tumor, the glioma. Scope of the current paper was to extract quantitatively lipids from porcine and human brain tissue as well as from five human gliomas using a modified protocol according to Folch. The lipid extracts were studied by Raman spectroscopy with 785 nm excitation and by mass spectrometry with electron impact ionization. Porcine and human brain tissues have similar water and lipid content and show similar Raman and mass spectra. In contrast, gliomas are characterized by increased water content and decreased lipid content. Elevated phosphatidylcholine to cholesterol ratios in lipid extracts of gliomas were indicated by Raman bands of the choline group and cholesterol. Due to its higher sensitivity, mass spectrometry detected increased levels of cholesterol ester relative to cholesterol in lipid extracts of gliomas. For comparison, thin tissue sections were prepared from the glioma specimens before lipid extraction; infrared spectroscopic images were recorded and analyzed by a supervised classification model. This study demonstrates how to improve the analysis of brain tumors and to complement the diagnosis of brain pathologies using a multimodal approach.

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Acknowledgment

We gratefully acknowledge the preparation and assessment of tissue sections by PD Dr. Katrin D. Geiger (Department of Neuropathology, University Hospital, University of Technology Dresden).

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  1. Christoph Krafft

    Present address: Institute of Photonic Technology, Albert-Einstein-Str. 9, 07745, Jena, Germany

Authors and Affiliations

  1. Institute for Analytical Chemistry, Dresden University of Technology, 01062, Dresden, Germany

    Milena Köhler, Susanne Machill, Reiner Salzer & Christoph Krafft

Authors
  1. Milena Köhler
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  2. Susanne Machill
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  3. Reiner Salzer
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  4. Christoph Krafft
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Correspondence to Christoph Krafft.

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Köhler, M., Machill, S., Salzer, R. et al. Characterization of lipid extracts from brain tissue and tumors using Raman spectroscopy and mass spectrometry. Anal Bioanal Chem 393, 1513–1520 (2009). https://doi.org/10.1007/s00216-008-2592-9

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  • DOI: https://doi.org/10.1007/s00216-008-2592-9

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