☆ 4.7 Article

Phase behavior, structure and rheology of candelilla wax/fully hydrogenated soybean oil mixtures with and without vegetable oil

FOOD RESEARCH INTERNATIONAL (2016)

Journal

FOOD RESEARCH INTERNATIONAL

Volume 89, Issue -, Pages 828-837

Publisher

ELSEVIER SCIENCE BV

DOI: 10.1016/j.foodres.2016.10.025

Keywords

Candelilla wax; Fully hydrogenated soybean oil; Mixed organogels; Viscoelastic properties; Structural recovery

Funding

Catedra Coca-Cola para jovenes investigadores-award
National Council for Science and Technology of Mexico (CONACYT) [135133]

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Abstract

Vegetable oil organogelation is one of the most promising strategies to eliminate trans fatty acids in plastic fats. Organogels prepared with edible wax are stable at refrigerator and room temperature. Some functional properties (i.e., texture) of wax organogels can be improved by adding saturated triacylglycerols. Mixtures of fully hydrogenated soybean oil (FH) and candelilla wax (CW) were studied with and without the addition of high oleic safflower oil (HOSFO). Crystallization and melting behavior, X-ray diffraction, and crystalline microstructure of the mixtures were analyzed. The elastic modulus (G'), and the structural recovery after shear of the organogels were also assessed. Mixtures without HOSFO formed solid dispersions of CW and FH crystals, where up to similar to 10% CW crystals were incorporated into the FH crystal lattice. The vegetable oil solutions of FH/CW mixtures crystallized from the melt, developed mixed crystal networks composed of FH crystals in the beta polymorph and CW in an orthorhombic subcell packing. As the systems crystallized in the most stable polymorph, only minor microstructural changes were shown along 28 days of storage at 25 degrees C. CW and FH crystals showed a synergistic effect on the elasticity of organogels. This was attributed to the large number FH crystals nucleated on the surface of CW crystals. The structural recovery after shear was superior for mixed organogels composed of CW platelets and grainy FH crystals compared to that of CW organogels. A recovery of up to 65.7% the G' of gels formed under static conditions was observed upon shearing. (C) 2016 Elsevier Ltd. All rights reserved.

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Effects of Wax Components and the Cooling Rate on Crystal Morphology and Mechanical Properties of Wax-Oil Mixtures

Han Wang, Severine A. E. Boyer, Michel Bellet, Florence Dalle

Summary: The crystal morphologies of binary and ternary model mixtures were studied under different cooling conditions. Needle-like crystals were formed in binary mixtures with fast cooling, while uncommon spherulitic crystals were observed in ternary mixtures with slow cooling. These different crystal morphologies resulted in distinct mechanical behavior. Mixtures with spherulitic crystals showed lower mechanical strength, and faster cooling led to higher Young's modulus and plasticity limit. The study also revealed a gradual change in crystal morphology in lipstick-shaped cast samples from surface to center, which corresponded to the differences in mechanical properties.

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