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Interfacial structurization between triolein and water from pH and buffer ions.
Frigerio, Matteo; V M Freire, Rafael; Soares, Thereza A; Amenitsch, Heinz; Leser, Martin E; Salentinig, Stefan.
Afiliación
  • Frigerio M; Department of Chemistry, University of Fribourg, Chemin Du Musée 9, 1700 Fribourg, Switzerland.
  • V M Freire R; Department of Chemistry, University of Fribourg, Chemin Du Musée 9, 1700 Fribourg, Switzerland.
  • Soares TA; Department of Chemistry, FFCLRP, University of São Paulo, Ribeirão Preto-SP, Brazil; Hylleraas Centre for Quantum Molecular Sciences, University of Oslo, Oslo, Norway.
  • Amenitsch H; Institute for Inorganic Chemistry, Graz University of Technology, Stremayergasse 9/V, Graz 8010, Austria.
  • Leser ME; Department of Chemistry, University of Fribourg, Chemin Du Musée 9, 1700 Fribourg, Switzerland.
  • Salentinig S; Department of Chemistry, University of Fribourg, Chemin Du Musée 9, 1700 Fribourg, Switzerland. Electronic address: stefan.salentinig@unifr.ch.
J Colloid Interface Sci ; 665: 1091-1101, 2024 Jul.
Article en En | MEDLINE | ID: mdl-38548506
ABSTRACT

HYPOTHESIS:

Understanding and manipulating the oil/water interface is important across various industries, including food, pharmaceuticals, cosmetics, and detergents. Many of these processes occur under elevated pH conditions in buffer systems, where base-catalyzed hydrolysis of triglyceride ester bonds leads to amphiphilic reaction products such as fatty acids. EXPERIMENTS Here, pH-triggered alterations of the triolein/water interface are analyzed in the presence of phosphate (PB) and tris(hydroxymethyl)aminomethane (TRIS). Ellipsometry at the liquid/liquid interface, tensiometry, and scanning small angle X-ray scattering are used to study the formation of structures at the oil/water interface. Confocal Raman microscopy, nuclear magnetic resonance spectroscopy, and in silico modeling analyze compositional changes in the interfacial region.

FINDINGS:

pH and buffer ions were discovered to significantly modify the triglyceride/water interface, contrary to the decane/water control. Decreasing interfacial tensions from 32.4 to 2.2 mN/m upon pH increase from 6.5 to 9.5 is seen with multilamellar interfacial layers forming at pH around 9.0 in the presence of TRIS. Oleic acid from triolein hydrolysis and its further interaction with TRIS is held responsible for this. The new understanding can guide the design of pH- and ion-responsive functional materials and optimize industrial processes involving triglyceride/water interfaces.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Colloid Interface Sci Año: 2024 Tipo del documento: Article País de afiliación: Suiza Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Colloid Interface Sci Año: 2024 Tipo del documento: Article País de afiliación: Suiza Pais de publicación: Estados Unidos