Linear and nonlinear viscoelasticity of oleogels based on vegetable oil and ethylene vinyl acetate copolymer/isotactic polypropylene blends

Alfonso, José Enrique Martín; Valencia, C.

doi:10.1002/app.42477

Cited by 7 publications

(4 citation statements)

References 23 publications

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“…After the compression stage, the probe was held at the same position to allow relaxation, where there was a decrease in the force values to a residual force (F r ). The residual force is a marker of the retained elastic component within the samples [22]. The 'F r ' values were in the same order of 'F 0 'values.…”

Section: Mechanical Studymentioning

confidence: 72%

Stearic Acid Modified Stearyl Alcohol Oleogel: Analysis of the Thermal, Mechanical and Drug Release Properties

Yadav

Kasiviswanathan

Soni

et al. 2017

J Surfact & Detergents

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The present study delineates the effect of stearic acid on the properties of stearyl alcohol oleogel. Herein, a series of oleogels were prepared by mixing different proportions of fatty alcohol (Stearyl alcohol; gelator) and fatty acid (stearic acid; co‐gelator). The characterization of the oleogels was done by thermal, macro‐scale stress relaxation, drug release, and antimicrobial studies. The oleogels were formed by the self‐assembly of stearyl alcohol/stearic acid. Thermal studies indicated that the stearic acid alters the crystal morphology, polymorphic transition and rate of crystallization of stearyl alcohol. The firmness of the oleogels with higher stearic proportion was better, which was due to the formation of a rigid network structure of stearyl alcohol in the presence of stearic acid. The release of ciprofloxacin hydrochloride, model drug, from the oleogels was better from the oleogels with higher stearic acid content. The release of the drug from the oleogels was Fickian diffusion‐mediated; except the oleogel with the highest stearic acid proportion. The antimicrobial study showed that the drug loaded oleogels were able to resist the growth of Escherichia coli, model microbe.

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Section: Mechanical Studymentioning

confidence: 72%

Stearic Acid Modified Stearyl Alcohol Oleogel: Analysis of the Thermal, Mechanical and Drug Release Properties

Yadav

Kasiviswanathan

Soni

et al. 2017

J Surfact & Detergents

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“…The structure of the oleogels was evaluated analyzing the damping factor (tan δ) . This rheological parameter describes the ratio between the elastic and viscous components (G' and G'', respectively) of the oleogels under shear at a constant strain (tan δ = G''/G') .…”

Section: Resultsmentioning

confidence: 99%

Sunflower wax recovered from oil tank settlings: Revaluation of a waste product from the oilseed industry

2019

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BACKGROUND: The sunflower oil industry produces a large amount of waste that is not currently commercially exploited, as in the case of oil-tank settlings. The recovery of a high value-added by-product, such as sunflower wax, would increase the commercial value of this waste. In this original research paper, a method that allows the recovery and purification of this by-product was developed. The wax was characterized and its potential use as an organogelator agent was investigated. RESULTS:The waste sample was composed of 45.1% oily material, 16.9% of this being impure waxes. Purification was performed through two different methods, obtaining three waxes with different degrees of purity. All the waxes were composed of wax esters with a range of 40-60 carbon atoms, exhibiting traces of carotenes, free fatty acids, and free fatty alcohols. The presence of phospholipids was observed in two of them. The third wax presented a higher total wax ester content and physicochemical characteristics (color and thermal behavior) similar to those of commercial sunflower waxes, and was the most efficient organogelator agent, requiring only a small amount of wax (1.5%) to structure high oleic sunflower oil. CONCLUSION: It was verified that sunflower wax could be recovered from oil-tank settlings. A purification method that allowed sunflower wax with similar physicochemical properties to those of commercial waxes to be obtained was also developed. The purified waxes were capable of structuring high oleic sunflower oil. Statistical analysisThe results were analyzed with a two-way ANOVA and a Fisher least significant difference (LSD) test ( = 0.05) using InfoStat statistical analysis software (Version 2018, Grupo InfoStat, FCA, National University of Cordoba, Argentina). 24 J Sci Food Agric 2020; 100: 201-211

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“…The decrease of moduli above a critical shear stress (τ c ), indicates a structural breakdown within the gel network. We observed that the loss modulus shows a slight increase at the end of the linear viscoelastic regime, which for some oleogels may be associated with energy dissipation attributed to microstructure reorganization before collapsing [ 28 ]. The values of G′ in the LVR reflects the density of interparticle contacts within the network, which were found to be an order of magnitude higher than those for G″.…”

Section: Resultsmentioning

confidence: 99%

Impact of Vegetable Oil Type on the Rheological and Tribological Behavior of Montmorillonite-Based Oleogels

Martín-Alfonso

Rubio‐Valle

Hinestroza

et al. 2022

Gels

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We formulated and characterized oleogels based on montmorillonite clay and vegetable oils that could serve as eco-friendly semi-solid lubricants. In particular, we studied the influence of the physical-chemical properties of olive, castor, soybean, linseed, and sunflower oils on the rheological, chemical, thermal, and tribological properties of the semi-solid lubricants. We prepared the oleogels via the highly intensive mixing of vegetable oils with clay at a concentration of 30 wt.%. The oleogels exhibited shear-thinning, thixotropy, structural recovery, and gel-like behavior commonly related to that of a three-dimensional network. The results were corroborated via XRD measurements showing the presence of intercalated nanoclay structures well-dispersed in the vegetable oil. Empirical correlations between the content of saturated (SFAs), unsaturated (UFAs), mono-unsaturated (MUFAs) and poly-unsaturated (PUFAs) fatty acids and the plateau modulus of the aerogels were found. From these experimental results, we can conclude that the fatty acid profile of the vegetable oils exerts an important influence on the rheological and tribological properties of resulting clay and vegetable oil oleogels.

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Linear and nonlinear viscoelasticity of oleogels based on vegetable oil and ethylene vinyl acetate copolymer/isotactic polypropylene blends

Cited by 7 publications

References 23 publications

Stearic Acid Modified Stearyl Alcohol Oleogel: Analysis of the Thermal, Mechanical and Drug Release Properties

Stearic Acid Modified Stearyl Alcohol Oleogel: Analysis of the Thermal, Mechanical and Drug Release Properties

Sunflower wax recovered from oil tank settlings: Revaluation of a waste product from the oilseed industry

Impact of Vegetable Oil Type on the Rheological and Tribological Behavior of Montmorillonite-Based Oleogels

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