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Inelastic neutron scattering study on bioprotectant systems.

S Magazù1, F Migliardo, A J Ramirez-Cuesta

  • 1Università di Messina, Dipartimento di Fisica and INFM, PO Box 55, S.ta Sperone C.da Papardo, 98166 Messina, Italy. smagazu@unime.it

Journal of the Royal Society, Interface
|July 20, 2006
PubMed
Summary

Trehalose, maltose, and sucrose mixtures with water were studied using inelastic neutron scattering (INS). Trehalose exhibits higher

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Area of Science:

  • * Condensed matter physics
  • * Biophysics
  • * Materials science

Background:

  • * Disaccharides like trehalose, maltose, and sucrose are crucial in biological systems, particularly for cryoprotection and cryptobiosis.
  • * Understanding their interaction with water at a molecular level is key to explaining their protective functions.
  • * Vibrational spectroscopy provides insights into the hydrogen-bonded network of water and the influence of solutes.

Purpose of the Study:

  • * To investigate the vibrational behavior of trehalose, maltose, and sucrose in aqueous mixtures using inelastic neutron scattering (INS).
  • * To characterize the structural modifications these disaccharides induce in the water hydrogen-bonded network.
  • * To correlate observed structural changes with the known cryoprotective and bioprotective properties of these disaccharides.

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Main Methods:

  • * Inelastic neutron scattering (INS) spectra were collected for homologous disaccharide (C12H22O11)/H2O mixtures.
  • * Experiments were performed at very low temperatures.
  • * An indirect geometry time-of-flight spectrometer (TOSCA) at the ISIS pulsed neutron facility was utilized.

Main Results:

  • * The trehalose/H2O system showed a higher degree of 'crystallinity' in the vibrational region of ice bending modes compared to maltose and sucrose.
  • * Analysis of the librational modes region indicated a greater destructuring effect of trehalose on the water network.
  • * Distinct vibrational signatures were observed for each disaccharide-water mixture.

Conclusions:

  • * The enhanced 'crystallinity' in trehalose/H2O mixtures may explain its superior cryptobiotic action.
  • * The significant destructuring effect of trehalose on water contributes to its potent bioprotective effectiveness.
  • * INS is a valuable tool for elucidating the structure-function relationships of disaccharides in aqueous systems.