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Liquid Crystals and their Application
Russian Journal

Zhidkie kristally i ikh prakticheskoe ispol'zovanie

Жидкие кристаллы и их практическое использование

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Rus Eng


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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2019, 19 (1), 14—25.
DOI: 10.18083/LCAppl.2019.1.14

Effect of Amino Acid and Oligopeptide Additives on Formation of Lyotropic Hexagonal Phase in Aqueous Solutions of Sodium Dodecyl Sulphate

N. V. Zharnikova1, А. I. Smirnova1, N. I. Giricheva1, V. G. Badelin2, N. V. Usol'tseva1

Author affiliations
1Ivanovo State University,
39 Ermak St., Ivanovo, 153025, Russia
2G. A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences,
1 Academicheskaya St., Ivanovo, 153045, Russia

The effect of amino acid (alanine) and oligopeptides (glycylglycine, glycylglycylglycine and alanylalanine) on the formation of lyotropic hexagonal mesophase in aqueous solutions of sodium dodecyl sulfate (SDS) was studied. For the first time, it was established that for the «SDS – oligopeptide – water» ternary systems there is a shift of the hexagonal mesophase to a region of lower SDS concentrations compared to the «SDS – water» binary system.
For the three-component system with alanine, such effect was not observed. The data were interpreted on the basis of ideas about the effect of hydrophilic-lipophilic balance on the curvature of the micelle surface. Quantum-chemical calculations performed for the «SDS – alanine – water» ternary system confirm that, while the three components (SDS, water and alanine) coexist in the system, the binding energy of alanine with the polar group of SDS only slightly exceeds the one of SDS with water.

Keywords: sodium dodecyl sulfate, amino acid, oligopeptide, binary and ternary systems, lyotropic mesomorphism, quantum-chemical calculations

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