Development and characterization of promising o/w nanoemulsions containing sweet fennel essential oil and non-ionic sufactants

Barradas, Thaís Nogueira; Campos, Vânia Emerich Bucco; Senna, Juliana Perdiz; Cerqueira, Cristal; Tebaldi, Bruna Santuzzi; Silva, Káttya Gyselle de Holanda e; Mansur, Cláudia R. E.

doi:10.1016/j.colsurfa.2014.12.001

Cited by 63 publications

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“…The particle size and the interfacial properties of nanoemulsions, which are influenced by the type of emulsifier, are determinants for their properties (physicochemical, stability, optical, rheological, etc.) (Barradas et al, ; McClements, ; Shamsara, Jafari, & Muhidinov, ).…”

Section: Resultsmentioning

confidence: 99%

“…ζ‐Potential is the difference in the electrical charge between the dense layer of ions surrounding the particles and the charge of the medium (Lu et al, ). Determining ζ‐potential can provide useful information regarding the kinetic stability of the system because a strong surface charge of the particles can prolong the stability of the colloid formulation by electrostatic repulsion, preventing destabilization phenomena such as Ostwald ripening and droplet coalescence (Barradas et al, ). The ζ‐potential value of all formulations ranged from −19.400 ± −0.500 to −0.677 ± −0.050 mV (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…a). According to the literature, when the absolute ζ‐potential value is higher than 25 mV, the main mechanism of emulsion stabilization is the electrostatic contribution (Barradas et al, ). In this case, all nanoemulsion formulations were stabilized by nonionic emulsifiers; hence, the magnitude of droplet charge was very low.…”

Section: Resultsmentioning

confidence: 99%

“…Specifically, nanoemulsion 6E6P40 remained stable and transparent during storage even though its ζ‐potential value was −1.68 ± −0.10 mV. The stabilization of such systems may be promoted by steric contribution from nonionic emulsifiers, and hence electrostatic repulsion is not the main stabilization mechanism against coalescence (Barradas et al, ). Barradas et al also claimed that, in general, the nonionic emulsifiers tend to decrease the magnitude of ζ‐potential values (Barradas et al, ).…”

Section: Resultsmentioning

confidence: 99%

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A Comparative Study of O/W Nanoemulsions Using Extra Virgin Olive or Olive‐Pomace Oil: Impacts on Formation and Stability

Katsouli

Giannou

Tzia

2018

J Americ Oil Chem Soc

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Nanoemulsions are considered an innovative approach for industrial food applications. The present study explored the potential use of olive-pomace oil (OPO) for oil-in-water (o/w) nanoemulsion preparations and compared the effectiveness of extra virgin olive oil (EVOO) and OPO at nanoemulsion formulations. The ternary-phase diagrams were constructed and the o/w nanoemulsions properties were evaluated in relation to their composition. The results showed that it is possible to form OPO nanoemulsions using Polysorbate 20 or Polysorbate 40. Nanoemulsions with EVOO and OPO presented desirable properties, in terms of kinetic stability (emulsion stability index % [ESI%]), mean droplet diameter (MDD), polydispersity index (PDI), ζ-potential, viscosity, and turbidity. EVOO exhibited lower surface and interfacial tension forming nanoemulsions with a high ESI% and a low MDD. However, OPO led to nanoemulsions with a high ESI% but with a higher MDD. It was observed that by increasing the emulsifier concentration the MDD decreased, while increasing the dispersed phase concentration led to a higher MDD and a lower ESI%. Finally, nanoemulsions with the smallest MDD (99.26 AE 4.20 nm) and PDI (0.236 AE 0.010) were formed using Polysorbate 40, which presented lower surface and interfacial tension. Specifically, the nanoemulsion with 6 wt% EVOO and 6 wt% Polysorbate 40 demonstrated an interfacial tension of 51.014 AE 0.919 mN m −1 and an MDD of 99.26 AE 4.20 nm. However, the nanoemulsion with 6 wt% OPO and 8 wt% Polysorbate 20 presented an interfacial tension of 54.308 AE 0.089 mN m −1 and an MDD of 340.5 AE 7.1 nm. Keywords Oil-in-water nanoemulsions Á Extra virgin olive oil Á Olive-pomace oil Á DLS measurements Á Surface tension Á High-performance liquid chromatography (HPLC) analysis J Am Oil Chem Soc (2018) 95: 1341-1353. Abbreviations ESI% emulsion stability index EVOO extra virgin olive oil MDD mean droplet diameter OPO olive-pomace oil o/w oil-in-water PCC phenolic compound content PDI polydispersity index RI refractive index TD ternary-phase diagrams * Constantina Tzia

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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A Comparative Study of O/W Nanoemulsions Using Extra Virgin Olive or Olive‐Pomace Oil: Impacts on Formation and Stability

Katsouli

Giannou

Tzia

2018

J Americ Oil Chem Soc

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“…The PDI values for systems I to V were: 0.114, 0.215, 0.259, 0.227, and 0.183 for initial measurements and 0.098, 0.208, 0.240, 0.225, and 0.179 after 30 days of storage time. All systems had a PDI value lower than 0.5, which is typical of homogenous and monodisperse systems [47,48]. Figure 5 shows that, by increasing the percentage of polyacrylamide in the LONano, the droplet diameter increases.…”

Section: Lonano Characterizationmentioning

confidence: 96%

Experimental Study of Nanofluids Applied in EOR Processes

Dantas

Souza

Neto

et al. 2017

J Surfact & Detergents

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Nanoemulsions are small droplet‐sized systems that have low surface tension and a small percentage of active material in their composition. In this study, low oil content nanoemulsion systems were developed for the use in enhanced oil recovery (EOR). The experiments were performed on a device capable of simulating petroleum reservoir conditions using sandstone rock cores. Nanoemulsions were obtained from a pre‐selected microemulsion system composed of: RNX95 as surfactant, isopropyl alcohol as cosurfactant, kerosene as oil phase, and distilled water as aqueous phase. Different percentages of polyacrylamide were added to the systems obtained to evaluate the influence of viscosity in EOR results. The nanoemulsion droplet sizes ranged from 9.22 to 14.8 nm. Surface tension values were in the range of 33.6–39.7 dyn/cm. A nanoemulsion system with 2.5 wt% surfactant was used in EOR assays. The oil recovery was directly proportional to polymer percentage in the nanoemulsion, ranging from 39.6 to 76.8%. The total oil in the place recovery ranged from 74.5 to 90%.

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