Chemistry, Physics and Technology of Surface, 2021, 12 (2), 149-154.

Peculiarities of alginic acid hydration in the air and in hydrophobic organic environment



DOI: https://doi.org/10.15407/hftp12.02.149

T. V. Krupskaya, N. V. Yelahina, L. P. Morozova, V. V. Turov

Abstract


The effect of the medium on the parameters of water bound to the surface of alginic acid powder was studied by low-temperature 1H NMR spectroscopy. The aim of this work was to study the effect of hydrophobic environment on the binding of water with alginic acid and to compare the parameters of the interfacial layers of water in air, in chloroform and chloroform with the addition of hydrochloric acid. It is shown that when adsorbed on the surface (500 mg/g H2O), most of it is strongly bound. It is shown that for most dispersed systems, when replacing the air with chloroform, the interfacial energy of water increases from 11.8 to 15.2 kJ/mol, which is due to the capability of weakly polar organic molecules to diffuse on the surface of solid particles, thereby reducing the interaction energy with the adsorbed surface water clusters. It is concluded that chloroform molecules cannot diffuse on the surface of alginic acid particles and affect only the structure of water clusters localized in the outer adsorption layer. In the presence of hydrochloric acid on the surface of alginic acid, a system of water clusters is formed, most of which does not dissolve hydrochloric acid, and the radii of these clusters is 2 nm, which are likely to form in the gaps between the polymer chains of polysaccharide.


Keywords


alginic acid; interfacial energy; strongly and weakly bound water; hydration

Full Text:

PDF

References


Davidson A. The Oxford Companion to Food. (Oxford: University Press, 2014). https://doi.org/10.1093/acref/9780199677337.001.0001

Boyd A., Chakrabarty A.M. Pseudomonas aeruginosa biofilms: role of the alginate exopolysaccharide. J. Ind. Microbiol. 1995. 15(3): 162. https://doi.org/10.1007/BF01569821

Leid J.G., Willson C.J., Shirtliff M.E., Hassett D.J., Parsek M.R., Jeffers A.K. The exopolysaccharide alginate protects Pseudomonas aeruginosa biofilm bacteria from IFN-gamma-mediated macrophage killing. J. Immunol. 2005. 175(11): 7512. https://doi.org/10.4049/jimmunol.175.11.7512

Usov A.I. Alginic acids and alginates: methods of analysis, composition and structure determination. Russ. Chem. Rev. 1999. 68(11): 957. https://doi.org/10.1070/RC1999v068n11ABEH000532

Chandler D. Interfaces and the driving force of hydrophobic assembly. Nature. 2005. 437: 640. https://doi.org/10.1038/nature04162

Li I.T., Walker G.C. Signature of hydrophobic hydration in a single polymer. Proc. Natl. Acad. Sci. U.S.A. 2011. 108(40): 16527. https://doi.org/10.1073/pnas.1105450108

Frolov Y.G. Course of Colloid Chemistry. (Moscow: Chemisty, 1988). [in Russian].

Mchedlov-Petrossyan M.O., Lebid V.I., Glazkova O.M., Lebid O.V. Colloid Chemistry. (Kharkiv: Karasina KhNU, 2012). [in Ukrainian].

Gun'ko V.M., Turov V.V., Pakhlov E.M., Krupska T.V., Borysenko M.V., Kartel M.T., Charmas B. Water interactions with hydrophobic versus hydrophilic nanosilica. Langmuir. 2018. 34(40): 12145. https://doi.org/10.1021/acs.langmuir.8b03110

Turov V.V., Gun'ko V.M. Clustered water and ways to use it. (Kyiv: Naukova dumka, 2011). [in Russian].

Gun'ko V.M., Turov V.V. Nuclear Magnetic Resonance Studies of Interfacial Phenomena. (New York: Taylor&Francis, 2013). https://doi.org/10.1201/b14202

Gun'ko V.M., Zarko V.I., Turov V.V., Leboda R., Chibowski E. Distribution effect of the second phase in disperse silica/X oxides (X = Al2O3, TiO2, GeO2) on their surface properties. Langmuir. 1999. 15(18): 5694. https://doi.org/10.1021/la981311e

Turov V.V., Gun'ko V.M., Pakhlov E.V., Krupska T.V., Tsapko M.D., Charmas B., Kartel M.T. Influence of hydrophobic nanosilica and hydrophobic medium on water in hydrophilic components of complex systems. Colloids Surf. A. 2018. 552: 39. https://doi.org/10.1016/j.colsurfa.2018.05.017

Turov V.V., Gun'ko V.M., Turova A.A., Morozova L.P., Voronin E.F. Interfacial behavior of concentrated HCl solution and water clustered at a surface of nanosilica in weakly polar silvent media. Colloids Surf. A. 2011. 390(1-3): 48. https://doi.org/10.1016/j.colsurfa.2011.08.053

Glushko V.P. Thermodynamic Properties of Individual Substances. (Moscow: Science, 1978).

Aksnes D.W., Forl K., Kimtys L. Pore size distribution in mesoporous materials as studied by 1H NMR. Phys. Chem. Chem. Phys. 2001. 3(15): 3203. https://doi.org/10.1039/b103228n

Petrov O.V., Furo I. NMR cryoporometry: Principles, application and potential. Prog. Nucl. Magn. Reson. Spectrosc. 2009. 54(2): 97. https://doi.org/10.1016/j.pnmrs.2008.06.001




DOI: https://doi.org/10.15407/hftp12.02.149

Copyright (©) 2021 T. V. Krupskaya, N. V. Yelahina, L. P. Morozova, V. V. Turov

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.