Inelastic Incoherent Neutron Scattering Measurements of Intact Cells and Tissues and Detection of Interfacial Water

Robert C. Ford, Stuart V. Ruffle, Anibal J. Ramirez-Cuesta, Ilias Michalarias, Ilir Beta, Aline Miller, Jichen Li, Aline Saiani

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We have previously used inelastic incoherent neutron scattering spectroscopy to investigate the properties of aqueous suspensions of biomolecules as a function of hydration. These experiments led to the identification of signals corresponding to interfacial (hydration) water at low water content. A prediction from these studies was that in the crowded environment inside living cells, a significant proportion of the water would be interfacial, with profound implications for biological function. Here we describe the first inelastic incoherent neutron scattering spectroscopy studies of living cells and tissues. We find that the interfacial water signal is similar to that observed for water interacting with purified biomolecules and other solutes, i.e., it is strongly perturbed in the librational and translational intermolecular optical regions of the spectrum at 20-150 meV. The ratio of interfacial water compared to total water in cells (∼30%) is in line with previous experimental data for hydration water and calculations based on simple assumptions.
    Original languageEnglish
    Pages (from-to)4682-4688
    Number of pages6
    JournalJournal of the American Chemical Society
    Volume126
    Issue number14
    DOIs
    Publication statusPublished - 14 Apr 2004

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