Food Biophysics

, Volume 5, Issue 3, pp 193–202

Relationship Between Molecular Structure and Thermo-mechanical Properties of Candelilla Wax and Amides Derived from (R)-12-Hydroxystearic Acid as Gelators of Safflower Oil


    • Facultad de Ciencias Químicas-CIEPUniversidad Autónoma de San Luis Potosí
    • Facultad de Ciencias Químicas-CIEPZona Universitaria
  • Juan Morales-Rueda
    • Facultad de Ciencias Químicas-CIEPUniversidad Autónoma de San Luis Potosí
  • V. Ajay Mallia
    • Department of ChemistryGeorgetown University
  • Richard G. Weiss
    • Department of ChemistryGeorgetown University

DOI: 10.1007/s11483-010-9159-y

Cite this article as:
Toro-Vazquez, J.F., Morales-Rueda, J., Mallia, V.A. et al. Food Biophysics (2010) 5: 193. doi:10.1007/s11483-010-9159-y


In this research, we studied the relationship between the molecular structure of (R)-12-hydroxyoctadecanamide, (R)-N-propyl-12-hydroxyoctadecanamide, and (R)-N-octadecyl-12-hydroxyoctadecanamide and the thermo-mechanical properties of their 2% (wt/wt) organogels developed using safflower oil high in oleic acid (HOSFO) as the liquid phase. Candelilla wax (CW), a well-known edible gelling additive whose main component is hentriacontane, also was studied for comparative purposes. The results obtained show that the attractive interactions (i.e., hydrogen bonding and dipolar interactions) between amide groups and between hydroxyl groups present in the amides resulted in organogels with higher melting temperature, heat of melting, and crystallization parameters than those found in the CW organogel. The rheological parameters associated to the strength of the amide or CW-based gels developed in HOSFO (i.e., yield stress and elastic modulus) seem to be associated with the nature of amide groups (i.e., primary or secondary amide) and the increase in the length of the self-assembly molecular unit (i.e., L value determined by X-ray diffraction) and therefore to the extent of London dispersion forces along the hydrocarbon chain. The creep and recovery measurements allowed an evaluation among the internal structures of the different organogels and demonstrated that independent of the hydrogen bonding and dipolar interaction provided by the amide and the hydroxyl groups, the increase in the hydrocarbon chain length results in higher organogel resistance to deformation and higher instant recovery capacity. However, the stabilization of the self-assembly unit through polar groups (i.e., –CONH2 in HOA) reduces organogel elasticity but provides a higher extended recovery capacity. The results reported in this investigation showed some relationships between gelator structure and the thermo-mechanical properties of low-molecular-mass organic gelator amides. Our long-term objective is to understand the organogelation process to eventually develop trans-free vegetable oil-based food products with novel textures for the consumers.


Organogels Hydroxystearic acid Candelilla wax Thixotropy Creep and compliance

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© Springer Science+Business Media, LLC 2010