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Journal of Thermal Analysis and Calorimetry

, Volume 134, Issue 3, pp 1599–1609 | Cite as

On the influence of fatty acid chain unsaturation on supramolecular gelation of aminocarbohydrate-based supra-amphiphiles

  • Douglas L. Cassimiro
  • Leonardo M. B. Ferreira
  • Ana Luiza R. de Souza
  • Mariana Fonseca
  • Suzy S. S. Kurokawa
  • Jovan D. Alonso
  • Victor Hugo V. Sarmento
  • Clovis Augusto RibeiroEmail author
Article
  • 77 Downloads

Abstract

Supramolecular gels are soft materials formed mainly by low molecular weight units held together by intermolecular interactions. Stabilizing these kinds of materials is quite a challenge due to the influence of multiple factors interfering with the integrity of the supramolecular structure. In our previous studies, we have shown that the aminocarbohydrate meglumine (MEG) interacts with organic acids by ion-pairing leading to the formation of MEG–carboxylate adducts. These adducts undergo supramolecular polymerization by heat treatment, but the macromolecular assembly was stable for a short period due to hydrogen bond (H-bond) breakup. Herein, we attempt to study the influence of hydrophobic building blocks on the formation of these compounds aiming to stabilize H-bonds to produce polymerizable supra-amphiphiles in water. Oleic acid and stearic acid are two analogous fatty acids differing only in the presence of unsaturation that were used in our studies. Results demonstrated that the presence of unsaturation hinders gelation in water by interfering with the self-assembly behavior of supra-amphiphiles. Thus, unsaturated supra-amphiphiles behave like traditional surfactants and gelify water at high concentrations (above 30% w/w). On the other hand, supramolecular gels with a polymer-like behavior could be produced with a saturated supra-amphiphile in water (above 4% w/w). The material was characterized by a lamellar arrangement that facilitates the alignment of H-bonds necessary to stabilize the self-assembled structure. These results have pivotal importance on the design of polymerizable supra-amphiphiles and demonstrate that the double bond of hydrophobic building blocks is an important design factor to be considered by scientists studying similar materials.

Keywords

Supramolecular amphiphiles Meglumine Fatty acids Supramolecular gelation Molecular design factors Double bond 

Notes

Acknowledgements

This work was financially supported by the Grant #2013/08411-0, São Paulo Research Foundation (FAPESP). We acknowledge the LNLS (Campinas, SP, Brazil) staff for SAXS facilities.

Supplementary material

10973_2018_7333_MOESM1_ESM.pdf (637 kb)
Supplementary material 1 (pdf 637 KB)

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  • Douglas L. Cassimiro
    • 3
  • Leonardo M. B. Ferreira
    • 2
  • Ana Luiza R. de Souza
    • 3
  • Mariana Fonseca
    • 3
  • Suzy S. S. Kurokawa
    • 3
  • Jovan D. Alonso
    • 3
  • Victor Hugo V. Sarmento
    • 1
  • Clovis Augusto Ribeiro
    • 3
    Email author
  1. 1.Department of ChemistryFederal University of Sergipe (UFS) AracajuBrazil
  2. 2.School of Pharmaceutical SciencesSão Paulo State University (UNESP) São PauloBrazil
  3. 3.Analytical Chemistry DepartmentSão Paulo State University IQ/UNESPAraraquaraBrazil

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