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Slow dynamics of hydration water and the trehalose dynamical transition
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Antal upphovsmän: 32019 (Engelska)Ingår i: Journal of Molecular Liquids, ISSN 0167-7322, E-ISSN 1873-3166, Vol. 282, s. 617-625Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We present results from molecular dynamics simulations of a solution of water and trehalose, a cryoprotecting disaccharide, upon cooling. We focus our attention on both the dynamics of hydration water and of the trehalose. Hydration water presents two slow relaxations. One is the a relaxation typical of glass formers and the second one is a long relaxation that was also found in proteins hydration water and appears coupled to the movement of the surface of trehaloses. Below 280 K trehalose aggregates and upon further cooling we find a dynamical transition for the trehalose aggregate at around 250 K similar to the well known Protein Dynamical Transition. When this transition happens the long relaxation time has a dynamical crossover. We hypothesize that this dynamical transition is a general feature that can be found not only in proteins but also in aggregates that interact with water and that have a flexible structure. In fact this feature has already been found not only in proteins hydration water but also in a colloidal microgel. In the known cases, including the one that we present here, water enhances movements of the surface of these aggregates above a certain temperature. The temperature of this dynamical transition ranges between 260 K and 220 K in all known cases.

Ort, förlag, år, upplaga, sidor
2019. Vol. 282, s. 617-625
Nyckelord [en]
Hydration water, Glassy dynamics, Trehalose, Dynamical transition
Nationell ämneskategori
Kemi Fysik
Identifikatorer
URN: urn:nbn:se:su:diva-169243DOI: 10.1016/j.molliq.2019.02.088ISI: 000465060400064OAI: oai:DiVA.org:su-169243DiVA, id: diva2:1323778
Tillgänglig från: 2019-06-12 Skapad: 2019-06-12 Senast uppdaterad: 2019-06-12Bibliografiskt granskad

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