Stabilization of model membrane systems by disaccharides. Quasielastic neutron scattering experiments and atomistic simulations

Emmanouil Doxastakis, Victoria Garcia Sakai, Satoshi Ohtake, Janna K. Maranas, Juan J. De Pablo

Research output: Contribution to conferencePaper

Abstract

Trehalose, a disaccharide of glucose, is often used for the stabilization of cell membranes in the absence of water. This work studies the effects of trehalose on the structure and dynamics of model membrane systems as they undergo a melting transition using a combination of experimental methods and atomistic molecular simulations. Quasielastic neutron scattering experiments on selectively deuterated samples provide the incoherent dynamic structure over a wide time range through the use of both time-of-flight and backscattering spectrometers. Elastic scans probing the lipid tail dynamics display clear evidence of a main melting transition that is significantly lowered in the presence of trehalose. Lipid headgroup mobility is considerably restricted at high temperatures and directly associated with the dynamics of the sugar in the mixture. Molecular simulations are employed to explore the nature of the motions present in the samples prior to and after the main transition. Changes in thermodynamic properties such as the area per lipid and the orientation of the chains are calculated at different temperatures. A detailed overview of the dynamics and their spatial and time dependence is also provided. The combined simulation and experimental methodology employed in this work offers a unique, molecular view of the physics of systems commonly employed in cryopreservation and lyophilization processes.

Original languageEnglish (US)
Number of pages1
StatePublished - Dec 1 2005
Event05AIChE: 2005 AIChE Annual Meeting and Fall Showcase - Cincinnati, OH, United States
Duration: Oct 30 2005Nov 4 2005

Other

Other05AIChE: 2005 AIChE Annual Meeting and Fall Showcase
CountryUnited States
CityCincinnati, OH
Period10/30/0511/4/05

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Neutron scattering
Stabilization
Membranes
Lipids
Experiments
Melting
Backscattering
Cell membranes
Sugars
Glucose
Spectrometers
Thermodynamic properties
Physics
Disaccharides
Temperature
Trehalose
Water

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Doxastakis, E., Sakai, V. G., Ohtake, S., Maranas, J. K., & De Pablo, J. J. (2005). Stabilization of model membrane systems by disaccharides. Quasielastic neutron scattering experiments and atomistic simulations. Paper presented at 05AIChE: 2005 AIChE Annual Meeting and Fall Showcase, Cincinnati, OH, United States.
Doxastakis, Emmanouil ; Sakai, Victoria Garcia ; Ohtake, Satoshi ; Maranas, Janna K. ; De Pablo, Juan J. / Stabilization of model membrane systems by disaccharides. Quasielastic neutron scattering experiments and atomistic simulations. Paper presented at 05AIChE: 2005 AIChE Annual Meeting and Fall Showcase, Cincinnati, OH, United States.1 p.
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Doxastakis, E, Sakai, VG, Ohtake, S, Maranas, JK & De Pablo, JJ 2005, 'Stabilization of model membrane systems by disaccharides. Quasielastic neutron scattering experiments and atomistic simulations', Paper presented at 05AIChE: 2005 AIChE Annual Meeting and Fall Showcase, Cincinnati, OH, United States, 10/30/05 - 11/4/05.

Stabilization of model membrane systems by disaccharides. Quasielastic neutron scattering experiments and atomistic simulations. / Doxastakis, Emmanouil; Sakai, Victoria Garcia; Ohtake, Satoshi; Maranas, Janna K.; De Pablo, Juan J.

2005. Paper presented at 05AIChE: 2005 AIChE Annual Meeting and Fall Showcase, Cincinnati, OH, United States.

Research output: Contribution to conferencePaper

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AU - De Pablo, Juan J.

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Doxastakis E, Sakai VG, Ohtake S, Maranas JK, De Pablo JJ. Stabilization of model membrane systems by disaccharides. Quasielastic neutron scattering experiments and atomistic simulations. 2005. Paper presented at 05AIChE: 2005 AIChE Annual Meeting and Fall Showcase, Cincinnati, OH, United States.