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Rheological and microstructural study of concentrated sunflower oil in water emulsions stabilized by food proteins | Estudio reológico y microestructural de emulsiones concentradas de aceite de girasol en agua estabilizadas con proteínas agroalimentarias Texte intégral
2008
Guerrero, A. | Bengoechea, C. | Romero, A. | Cordobés, F., Universidad de Sevilla (España). Facultad de Química
Se ha realizado un estudio de la distribución del tamaño de gotas y de las propiedades viscoelásticas lineales de emulsiones concentradas de aceite en agua, estabilizadas con diferentes proteínas (cangrejo, gluten y soja). Los sistemas estudiados siempre presentan un comportamiento típico de emulsiones altamente concentradas con un alto grado de floculación. Se ha observado que un incremento de la velocidad de agitación empleada durante la preparación o de la concentración de emulsionante dan lugar a un aumento de los módulos viscoelásticos (G' y G") y a una disminución del tamaño de gotas. Por tanto se produce un reforzamiento del entramado formado por asociación de las gotas de fase dispersa y como consecuencia, un aumento en la estabilidad de las emulsiones. | Droplet Size Distribution (DSD) and linear viscoelastic properties of concentrated o/w emulsions stabilized by different proteins (crayfish, gluten and soybean) have been studied. A typical behaviour of highly concentrated emulsions with a high degree of flocculation has been found. An increase in energy input for the emulsification process or in emulsifier concentration leads to an increase in both viscoelastic moduli (G', G") as well as to a decrease in droplet size. Thus, an enhancement of the entanglement network produced by association of protein molecules that are surrounding oil droplets or are present in the continuous phase takes place, leading to a significant improvement of emulsion stability.
Afficher plus [+] Moins [-]Stabilization of soybean oil by flaxseed gum and NMR characterization of its oil–water interface | Estabilización del aceite de soya [soja] utilizando goma de linaza y caracterización de su interfaz aceite-agua mediante RMN Texte intégral
2019
Feng, Mei-Qin | Wang, Meng | Sun, Jian | Xu, Xing-Lian | Zhou, Guang-Hong
Stabilization of soybean oil by flaxseed gum and NMR characterization of its oil–water interface | Estabilización del aceite de soya [soja] utilizando goma de linaza y caracterización de su interfaz aceite-agua mediante RMN Texte intégral
2019
Feng, Mei-Qin | Wang, Meng | Sun, Jian | Xu, Xing-Lian | Zhou, Guang-Hong
The effects of different concentration of flaxseed gum (FG) (0.1–0.5%, w/w) on the stability of soybean oil emulsion were studied by particle size, rheological properties, creaming stability and nuclear magnetic resonance (NMR). Results showed that emulsion particle size decreased significantly with the increase in FG concentration. Rheological measurements showed FG exhibited thickening and gelling properties. Viscosity, storage modulus, and loss modulus increased accordingly with the increase in FG concentrations, and emulsions with 0.5% FG looked like a viscoelastic solid. Emulsions with a higher FG concentration exhibited better creaming stability and structure. With the increase of FG concentration, the ¹H and ¹³C NMR spectra line widths in high field also increased, which confirms that the interaction between FG and oil molecules is enhanced. These results show that FG can substitute for other emulsifiers or stabilizers in emulsions, and is beneficial to the stability of emulsions.
Afficher plus [+] Moins [-]Stabilization of soybean oil by flaxseed gum and NMR characterization of its oil–water interface Texte intégral
2019
Mei-Qin Feng | Meng Wang | Jian Sun | Xing-Lian Xu | Guang-Hong Zhou
The effects of different concentration of flaxseed gum (FG) (0.1–0.5%, w/w) on the stability of soybean oil emulsion were studied by particle size, rheological properties, creaming stability and nuclear magnetic resonance (NMR). Results showed that emulsion particle size decreased significantly with the increase in FG concentration. Rheological measurements showed FG exhibited thickening and gelling properties. Viscosity, storage modulus, and loss modulus increased accordingly with the increase in FG concentrations, and emulsions with 0.5% FG looked like a viscoelastic solid. Emulsions with a higher FG concentration exhibited better creaming stability and structure. With the increase of FG concentration, the 1H and 13C NMR spectra line widths in high field also increased, which confirms that the interaction between FG and oil molecules is enhanced. These results show that FG can substitute for other emulsifiers or stabilizers in emulsions, and is beneficial to the stability of emulsions.
Afficher plus [+] Moins [-]Estabilizacion de emulsiones alimentarias aceite en agua por modificacion del contenido en emulsionante y estabilizante.
1996
Gallegos C. | Franco J.M. | Trujillo J.E. | Algeciras J.L.
