NMR study of non-freezing water in protein-modified carbon adsorbents

T.A. Alekseeva, N.I. Lebovka, Sergey Mikhalovsky

Research output: Contribution to journalArticle

Abstract

Temperature dependences of 1H NMR spin–spin relaxation were studied for the non-freezing water at the surface of carbon matrices modified with proteins (human serum albumin (HSA) and mouse immunoglobulin (MIG)) in the presence of water-soluble carbodiimide. The entropy, DeltaS ne, and enthalpy, DeltaH ne, values characterizing molecular mobility in non-freezing water were estimated. The compensation effect was observed for all modified samples, which is well approximated by the linear dependence of the type DeltaH ne = T 0DeltaS ne + DeltaH ne 0. The compensation temperature T 0 = 231 ± 33 corresponds to such a state of non-freezing water, when the effect of modifying additives on the isobaric potential of molecular mobility activation in the non-freezing water, DeltaG ne, is minimal. The DeltaG ne has approximately constant value equal to DeltaH ne 0 = 24.2 ± 0.5 kJ/mol. Modification of the base carbon matrix with MIG protein results in higher structurization of the non-freezing water, whereas HSA reduces this structurization. The observed effects are explained in terms of the hydration of modifying agents and also by the peculiarities of their location on the surface of carbon adsorbent.
Original languageEnglish
Pages (from-to)275-278
Number of pages4
JournalColloid Journal
Volume65
Issue number3
DOIs
Publication statusPublished - May 2003

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Adsorbents
Carbon
Nuclear magnetic resonance
Water
Proteins
Serum Albumin
Immunoglobulins
Carbodiimides
Hydration
Enthalpy
Entropy
Chemical activation
Temperature
Compensation and Redress

Bibliographical note

The original publication is available at www.springerlink.com

Cite this

Alekseeva, T.A. ; Lebovka, N.I. ; Mikhalovsky, Sergey. / NMR study of non-freezing water in protein-modified carbon adsorbents. In: Colloid Journal. 2003 ; Vol. 65, No. 3. pp. 275-278.
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Alekseeva, TA, Lebovka, NI & Mikhalovsky, S 2003, 'NMR study of non-freezing water in protein-modified carbon adsorbents', Colloid Journal, vol. 65, no. 3, pp. 275-278. https://doi.org/10.1023/A:1024286102129

NMR study of non-freezing water in protein-modified carbon adsorbents. / Alekseeva, T.A.; Lebovka, N.I.; Mikhalovsky, Sergey.

In: Colloid Journal, Vol. 65, No. 3, 05.2003, p. 275-278.

Research output: Contribution to journalArticle

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AU - Alekseeva, T.A.

AU - Lebovka, N.I.

AU - Mikhalovsky, Sergey

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AB - Temperature dependences of 1H NMR spin–spin relaxation were studied for the non-freezing water at the surface of carbon matrices modified with proteins (human serum albumin (HSA) and mouse immunoglobulin (MIG)) in the presence of water-soluble carbodiimide. The entropy, DeltaS ne, and enthalpy, DeltaH ne, values characterizing molecular mobility in non-freezing water were estimated. The compensation effect was observed for all modified samples, which is well approximated by the linear dependence of the type DeltaH ne = T 0DeltaS ne + DeltaH ne 0. The compensation temperature T 0 = 231 ± 33 corresponds to such a state of non-freezing water, when the effect of modifying additives on the isobaric potential of molecular mobility activation in the non-freezing water, DeltaG ne, is minimal. The DeltaG ne has approximately constant value equal to DeltaH ne 0 = 24.2 ± 0.5 kJ/mol. Modification of the base carbon matrix with MIG protein results in higher structurization of the non-freezing water, whereas HSA reduces this structurization. The observed effects are explained in terms of the hydration of modifying agents and also by the peculiarities of their location on the surface of carbon adsorbent.

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