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X-ray characterization of three possible edible oleogelators: Experiment and Theory
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  • Fernanda Peyronel,
  • Joseph Cooney,
  • Erzsebet Papp-Szabo,
  • Silvana Martini,
  • David Pink
Fernanda Peyronel
University of Guelph

Corresponding Author:[email protected]

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Joseph Cooney
Utah State University
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Erzsebet Papp-Szabo
St Francis Xavier University
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Silvana Martini
Utah State University
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David Pink
St Francis Xavier University
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Three oleogeletors molecules (Triacontane (TC), Stearic acid (SA), and Behenyl Lignocerate (BL)) were studied individually, in pairs, or all together to make an oleogel using triolein as the oil. WAXS, SAXS and USAXS were used to elucidate the solid structures from angstroms to a few micrometers. A two-dimensional mapping of atomic positions for each molecule was carried out to understand the crystalline multilayer structures formed. We assumed that the molecules were rigidly extended and that they underwent no significant (hindered) rotations so that the free energy is determined by the Lennard-Jones interactions of closely-packed multilayers. TC molecules were predicted to form a tilt angle of θt ≈ 33°, yielding a SAXS line at q≈ 0.194 Å-1, in acceptable agreement with the measured q=0.181 Å-1.For SA crystals θt ≈ 33° (predicted) yielding a SAXS line at q=0.150 Å-1 compared to q=0.159 Å -1 (observed). No mixed crystals were observed for any pair of molecules or when all three were used. USAXS data showed that SA forms large nanocrystals compared to TC and BL. All three combinations of molecular pairs showed basic scatterers smaller or similar to those of individual molecules. The theory presented here, together with the experimental results, showed why no mixed crystals are formed from two or all three molecules. Data from the USAXS region suggested that, when using all three molecules, a more compact fractal structure was obtained, compared with those if one or two of the molecules were used.
08 Apr 2023Submitted to Journal of the American Oil Chemists' Society
10 Apr 2023Submission Checks Completed
10 Apr 2023Assigned to Editor
10 Apr 2023Review(s) Completed, Editorial Evaluation Pending
19 Apr 2023Reviewer(s) Assigned
26 May 2023Editorial Decision: Revise Minor
03 Jul 20231st Revision Received
05 Jul 2023Submission Checks Completed
05 Jul 2023Assigned to Editor
05 Jul 2023Review(s) Completed, Editorial Evaluation Pending
05 Jul 2023Reviewer(s) Assigned
24 Jul 2023Editorial Decision: Accept