title: Interfacial properties of Quillaja saponins and its use for micellisation of lutein esters.
abstract: Natural food colourants, colouring foods and bioactive food ingredients need to be solubilised for their incorporation in food. Aim of the present study was to investigate the micelle-forming properties of saponins from Quillaja saponaria Mollina (QS) in order to solubilise a lutein ester extract for its incorporation in food matrices. QS showed a high surface activity and functionality with respect to micellisation as derived from interfacial tension measurements and subsequent data fitting to the classical Frumkin model. The composition of the aqueous phase affected the lutein ester incorporation as revealed by particle size, zeta potential and colour measurements. In terms of morphology of lutein ester loaded saponin micelles (LMS), cryo-TEM micrographs showed depending on the composition of the medium both, spherical and elongated branched micelles.
authors.affiliation: Department of Food Technology and Food Material Science, Technische Universität Berlin, Königin-Luise-Str. 22, 14195 Berlin, Germany. Electronic address: janine.tippel@campus.tu-berlin.de.
authors.forename: Janine
authors.initials: J
authors.lastname: Tippel
authors.affiliation: Department of Applied Physical Chemistry, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany. Electronic address: maren.lehmann@campus.tu-berlin.de.
authors.forename: Maren
authors.initials: M
authors.lastname: Lehmann
authors.affiliation: Department of Applied Physical Chemistry, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany. Electronic address: klitzing@mailbox.tu-berlin.de.
authors.forename: Regine
authors.initials: R
authors.lastname: von Klitzing
authors.affiliation: Department of Food Technology and Food Material Science, Technische Universität Berlin, Königin-Luise-Str. 22, 14195 Berlin, Germany. Electronic address: stephan.drusch@tu-berlin.de.
authors.forename: Stephan
authors.initials: S
authors.lastname: Drusch
mesh_terms: D004952:Esters / Q000378:metabolism; D014975:Lutein / Q000378:metabolism*; D008823:Micelles; D010316:Particle Size; D010936:Plant Extracts; D031990:Quillaja / Q000378:metabolism*; D062605:Quillaja Saponins / Q000378:metabolism*; D012503:Saponins / Q000378:metabolism*; D013500:Surface Tension
chemical_list: D004952:Esters; D008823:Micelles; D010936:Plant Extracts; D062605:Quillaja Saponins; D012503:Saponins; D014975:Lutein
keywords: Carotenoid; Colour; Cryo-TEM; Lutein ester extract; Micellisation; Quillaja saponaria Molina; Saponin; Stability