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Interfacial and Foaming Properties of Tailor-Made Glycolipids—Influence of the Hydrophilic Head Group and Functional Groups in the Hydrophobic Tail

Hollenbach, Rebecca; Völp, Annika Ricarda; Höfert, Ludwig; Rudat, Jens; Ochsenreither, Katrin; Willenbacher, Norbert; Syldatk, Christoph

Abstract (englisch):
Glycolipids are a class of biodegradable surfactants less harmful to the environment than petrochemically derived surfactants. Here we discuss interfacial properties, foam stability, characterized in terms of transient foam height, gas volume fraction and bubble diameter as well as texture of seven enzymatically synthesized surfactants for the first time. Glycolipids consisting of different head groups, namely glucose, sorbitol, glucuronic acid and sorbose, combined with different C10 acyl chains, namely decanoate, dec-9-enoate and 4-methyl-nonanoate are compared. Equilibrium interfacial tension values vary between 24.3 and 29.6 mN/m, critical micelle concentration varies between 0.7 and 3.0 mM. In both cases highest values were found for the surfactants with unsaturated or branched tail groups. Interfacial elasticity and viscosity, however, were significantly reduced in these cases. Head and tail group both affect foam stability. Foams from glycolipids with sorbose and glucuronic acid derived head groups showed higher stability than those from surfactants with glucose head group, sorbitol provided lowest foam stability. We attribute this to different head group hydration also showing up in the time to reach equilibrium interfacial adsorption. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000123547
Veröffentlicht am 11.09.2020
DOI: 10.3390/molecules25173797
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Bio- und Lebensmitteltechnik (BLT)
Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1420-3049
KITopen-ID: 1000123547
Erschienen in Molecules
Band 25
Heft 17
Seiten 3797
Bemerkung zur Veröffentlichung This article belongs to the Special Issue New Frontiers Regarding Surfactants and Biosurfactants: Production, Characterization and Application
Vorab online veröffentlicht am 20.08.2020
Nachgewiesen in Scopus
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