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Microscopic mechanism of water diffusion in glucose glasses

Molinero, Valeria and Goddard, William A., III (2005) Microscopic mechanism of water diffusion in glucose glasses. Physical Review Letters, 95 (4). Art. No. 045701. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:MOLprl05

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Abstract

The preservation of biomaterials depends critically on the mobility of water in the glassy state, manifested as a secondary beta relaxation and diffusion. We use coarse grain simulations to elucidate the molecular mechanism underlying the relaxations for water-glucose glass, finding two pathways for water diffusion: (i) water jumps into neighbor water positions (linking to water structure), and (ii) water jumps into glucose positions (coupling to glucose rotation). This work suggests strategies for enhancing preservation by stiffening the segmental motions of the carbohydrates.


Item Type:Article
Additional Information:©2005 The American Physical Society. Received 26 October 2004; published 21 July 2005. The facilities of the Materials and Process Simulation Center are supported by ONR-DURIP, ARO-DURIP. In addition the MSC is supported by MURI-ARO, MURI-ONR, DOE (ASC, FETL), NSF (CHE), NIH, Aventis Pharma, ChevronTexaco, Nissan Corp., Berlix Biopharma, and Beckman Institute.
Subject Keywords:RELAXATION; MIXTURES; MALTOSE; NMR; TRANSITION; LIQUID; STATES; SUCROSE; SUGAR; FIELD
Record Number:CaltechAUTHORS:MOLprl05
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:MOLprl05
Alternative URL:http://dx.doi.org/10.1103/PhysRevLett.95.045701
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3300
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:26 May 2006
Last Modified:18 Sep 2014 18:11

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