Combined effect of shearing and cooling rate on the rheology of organogels developed by selected gelators

Peña‐Gil, Anaid De la; Álvarez-Mitre, F.M.; González‐Chávez, Marco Martín; Charó-Alonso, Míriam A.; Toro‐Vázquez, Jorge F.

doi:10.1016/j.foodres.2017.01.010

Cited by 18 publications

(8 citation statements)

References 34 publications

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“…Also, there are dependencies on the temperature ramp, shown by the fact that a ramp of 0.5 °C min –1 seems too slow to show a detectable heat exchange process (data not shown) but a ramp of 2 or 5 °C min –1 accentuates the curves of heat flow and shifts the transition temperatures compared to the ramp of 1 °C min –1 (Figure S4). This was observed in other cases with organogelators and can be explained not only by the thermal inertia of the crucibles but also by the fact that the state transition is indeed time-dependent and impacted by the temperature gradient. To probe the thermal inertia of crucibles, we measured the heating cycle of azobenzene at these temperature ramps (Figure S5).…”

Section: Resultsmentioning

confidence: 58%

Self-Assembly of Nucleoside-Derived Low-Molecular-Weight Gelators: A Thermodynamics and Kinetics Study on Different Length Scales

et al. 2020

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Biocompatible materials are of paramount importance in numerous fields. Unlike chemically-bridge polymer-based hydrogels, low molecular weight gelators can form a reversible hydrogel as their structure rely on non-covalent interaction. Although many applications with this type of hydrogels can be envisioned, we still lack their understanding due to the complexity of their self-assembly process and the difficulty predicting their behaviors (transition temperature, gelation kinetic, impact of solvent…). In this study, we extend the investigations of a series of nucleoside-derivatives gelators which only differ by subtle chemical modifications. Using a multi-technique approach, we determined their thermodynamic and kinetic features at various scale (molecular to macro) in different conditions. Monitored at supramolecular level by circular dichroism as well as macroscopic scales by rheology and turbidimetry, we found out that sol-gel and gel-sol transition are greatly depending on the concentration and on the mechanisms that are probed. Self-assembly kinetic depends on hydrogel molecules and is modulated by temperature and solvent. This fundamental study provides insight on the impact of some parameters on the gelation process, such as concentration, cooling rate and nature of the solvent.

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Section: Resultsmentioning

confidence: 58%

Self-Assembly of Nucleoside-Derived Low-Molecular-Weight Gelators: A Thermodynamics and Kinetics Study on Different Length Scales

et al. 2020

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“…Firmness is one of the most important criteria for the characterization of semi-solid fat phases. Currently, mainly rheological investigations are used in the assessment of differently cooled oleogels [25][26][27]. This seems to be appropriate whenever the structure efficiency of the investigated system is low and the applied rates are neither extremely low nor very high.…”

Section: Firmness Measurement Of Cooling Rate Treated Oleogelsmentioning

confidence: 99%

Effect of Cooling Rate on the Oleogel Properties of Wax–Wax-Hydrolyzate Mixtures

Wettlaufer

Flöter

2022

Food Biophysics

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In this contribution, the effect of cooling rates on a wide compositional range of waxes as oleogel structurants was systematically investigated. The different waxes exhibited varying levels of wax esters (WE), fatty acids (FA), fatty alcohols (FaOH) and hydrocarbons (HC) and were systematically altered by combinations of sunflower wax (SFW), bees wax (BW) and their hydrolyzed variants (SFWh, BWh). By applying slow, medium and high cooling rates, the resulting gel properties were investigated in terms of firmness, calorimetry and microstructure. It was found that the calorimetrical signal is mainly affected by the waxes’ composition. However, due to enlarged dynamic induction times upon crystallization, a shift in dissolution temperature could be observed in heating scans. In our latest work we were able to formulate the degree of homogeneity (DoH), with which it was possible to predict the undercooling in SFW mixtures. The introduction of a novel method emerged for firmness measurements of oleogels treated with the different rates. Thus, it was possible to detect with high sensitivity for all waxes for applied cooling rates, caused by modification of microstructure. Combination of different methods further elucidated that higher rates need to be applied to further scale firmness of oleogels in industrial processes.

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“…Oleogelation can be achieved by initially dissolving a gelator by heating it in the organic solvent and then cooling the solution to a temperature below the solubility limit of the gelator. Under this condition, gelators such as n-alkanes [14], monoglycerides [15], 12-hydroxystearic acid [16,17], some amides [18], lecithin [19,20] and some plant waxes (e.g., candelilla wax, rice bran wax and carnauba wax) [21][22][23][24] go through spontaneous molecular assembly in vegetable oils and mineral oil [20,[25][26][27][28]. Different studies have shown that oleogels are a viable alternative for saturated and trans fat substitution in food products [23,[29][30][31][32] and cosmetic uses [33,34], and recently, they have been used for the controlled supply of substances such as minerals and pharmaceutical products, thus achieving a fluid exchange capacity with the environment [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Development of Candelilla Wax Oleogels as a Medium of Controlled Release of Phosphorus in an In Vitro Model

et al. 2021

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Candelilla wax (CW) oleogels were developed as an alternative bolus material for delivering phosphorus into the rumen of goats. The systems were studied at three CW concentrations (10%, 15% and 20%) in vegetable oil. Each oleogel was added with a specific amount of calcium orthophosphate as a phosphorus source. The thermomechanical properties of the oleogels were characterized by DSC and rheology, and the viability of phosphorus delivery was evaluated using a laboratory model in two mediums (one aqueous and another with ruminal fluid). The results showed that the oleogels had a higher melting point (~52.8 °C) than the temperature of the ruminal environment and greater G′ values (1.6 × 106 Pa in 20% CW oleogel with phosphorus). Such characteristics guaranteed the integrity of the materials during the process in the model systems studied. It was demonstrated that when using the 20% CW oleogel, the phosphorus was slowly released for 84 h, completing a maximum of 83.3–98% of the total amount of phosphorus added to the bolus (in the aqueous and ruminal fluid models, respectively). These results enable us to propose this material as a delivery system for phosphorus supplementation in goats. Its effectivity in goats will be evaluated in future in vivo investigations.

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Combined effect of shearing and cooling rate on the rheology of organogels developed by selected gelators

Cited by 18 publications

References 34 publications

Self-Assembly of Nucleoside-Derived Low-Molecular-Weight Gelators: A Thermodynamics and Kinetics Study on Different Length Scales

Self-Assembly of Nucleoside-Derived Low-Molecular-Weight Gelators: A Thermodynamics and Kinetics Study on Different Length Scales

Effect of Cooling Rate on the Oleogel Properties of Wax–Wax-Hydrolyzate Mixtures

Development of Candelilla Wax Oleogels as a Medium of Controlled Release of Phosphorus in an In Vitro Model

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