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Issue 13, 2020
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On the microscopic origin of the cryoprotective effect in lysine solutions

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Abstract

The amino acid lysine has been shown to prevent water crystallization at low temperatures in saturated aqueous solutions [S. Cerveny and J. Swenson, Phys. Chem. Chem. Phys., 2014, 16, 22382–22390]. Here, we investigate two ratios of water and lysine (5.4 water molecules per lysine (saturated) and 11 water molecules per lysine) by means of the complementary use of computer simulations and neutron diffraction. By performing a detailed structural analysis we have been able to explain the anti-freeze properties of lysine by the strong hydrogen bond interactions of interstitial water molecules with lysine that prevent them from forming crystalline seeds. Additional water molecules beyond the 1 : 5.4 proportion are no longer tightly bonded to lysine and therefore are free to form crystals.

Graphical abstract: On the microscopic origin of the cryoprotective effect in lysine solutions

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Supplementary files

Article information


Submitted
15 Nov 2019
Accepted
05 Mar 2020
First published
06 Mar 2020

Phys. Chem. Chem. Phys., 2020,22, 6919-6927
Article type
Paper

On the microscopic origin of the cryoprotective effect in lysine solutions

A. Henao, G. N. Ruiz, N. Steinke, S. Cerveny, R. Macovez, E. Guàrdia, S. Busch, S. E. McLain, C. D. Lorenz and L. C. Pardo, Phys. Chem. Chem. Phys., 2020, 22, 6919
DOI: 10.1039/C9CP06192D

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