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Adsorption at the biocompatible α-pinene-water interface and emulsifying properties of two eco-friendly surfactants.
Trujillo-Cayado, Luis Alfonso; Ramírez, Pablo; Alfaro, María Carmen; Ruíz, Manuela; Muñoz, José.
Afiliación
  • Trujillo-Cayado LA; Departamento de Ingeniería Química, Facultad de Química, Universidad de Sevilla, c/P, García González, 1, E41012 Sevilla, Spain.
  • Ramírez P; Departamento de Ingeniería Química, Facultad de Química, Universidad de Sevilla, c/P, García González, 1, E41012 Sevilla, Spain. Electronic address: pramirez@us.es.
  • Alfaro MC; Departamento de Ingeniería Química, Facultad de Química, Universidad de Sevilla, c/P, García González, 1, E41012 Sevilla, Spain.
  • Ruíz M; Departamento de Ingeniería Química, Facultad de Química, Universidad de Sevilla, c/P, García González, 1, E41012 Sevilla, Spain.
  • Muñoz J; Departamento de Ingeniería Química, Facultad de Química, Universidad de Sevilla, c/P, García González, 1, E41012 Sevilla, Spain.
Colloids Surf B Biointerfaces ; 122: 623-629, 2014 Oct 01.
Article en En | MEDLINE | ID: mdl-25129697
In this contribution, we provide an accurate characterization at the α-pinene/water interface of two commercial polyoxytheylene glycerol ester surfactants which differ in the number of ethylene oxide (EO) groups, comprising a systematic analysis of interfacial pressure isotherms, dynamic curves, interfacial rheology and emulsifying properties. Polyoxyethylene glycerol esters derived from cocoa oil are non-ionic surfactants obtained from a renewable source which fulfill the environmental and toxicological requirements to be used as eco-friendly emulsifying agents. α-Pinene is a renewable biosolvent completely insoluble in water, which could find numerous applications. Interfacial rheology and equilibrium interfacial pressure data fitted a rigorous reorientation model that assumes that the surfactant molecules, when adsorbed at the interface, can acquire two orientations. The surfactant with the highest number of EO groups (Levenol C201) turned out to be more surface active at the α-pinene/water interface. In addition, the surfactant with the lowest number of EO groups (Levenol H&B) is solubilized into the adjacent oil phase. Slightly concentrated α-pinene emulsions were obtained using both surfactants. Nevertheless, more stable α-pinene emulsions with smaller droplet sizes and lower polidispersity were obtained when Levenol C201 was used as emulsifier instead of Levenol H&B. The systematic characterization presented in this work provides important new findings on the interfacial and emulsifying properties of polyoxytheylene glycerol ester surfactants, which can be applied in the rational development of new biocompatible products.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Tensoactivos / Materiales Biocompatibles / Agua / Monoterpenos / Emulsiones Tipo de estudio: Prognostic_studies Idioma: En Revista: Colloids Surf B Biointerfaces Asunto de la revista: QUIMICA Año: 2014 Tipo del documento: Article País de afiliación: España Pais de publicación: Países Bajos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Tensoactivos / Materiales Biocompatibles / Agua / Monoterpenos / Emulsiones Tipo de estudio: Prognostic_studies Idioma: En Revista: Colloids Surf B Biointerfaces Asunto de la revista: QUIMICA Año: 2014 Tipo del documento: Article País de afiliación: España Pais de publicación: Países Bajos