Forces between Emulsion Droplets Stabilized with Tween 20 and Proteins

Autor:	and Tatiana D. Dimitrova, Fernando Leal-Calderon‡
Rok vydání:	1999
Předmět:	Steric effects Chromatography biology Force profile Chemistry Condensation Thermodynamics Surfaces and Interfaces Condensed Matter Physics Electrostatics Electrochemistry biology.protein DLVO theory General Materials Science Bovine serum albumin Emulsion droplet Chaining technique Spectroscopy
Zdroj:	Langmuir. 15:8813-8821
ISSN:	1520-5827 0743-7463
DOI:	10.1021/la9904758
Popis:	We measured forces between tiny emulsion droplets by using the magnetic chaining technique. Force versus distance profiles were obtained for emulsions stabilized by Tween 20, Tween 20/BSA (bovine serum albumin) mixtures, and β-casein. For emulsions stabilized with Tween 20 alone, we observed classical DLVO behavior. At very large Tween 20 concentration, the force profile is clearly deviating from the double-layer repulsion. An interpretation of the data is proposed combining classical DLVO with steric-like additional effective repulsion due to the micellar condensation on the droplet surface. The systems that contain both Tween 20 and BSA qualitatively show the same kind of behavior: the purely electrostatic repulsion is progressively transformed into a steric one in the presence of BSA. The emulsions stabilized by β-casein obey a different type of behavior: in that case the depletion attraction is found to be of great importance. The data are interpreted assuming additivity of standard DLVO forces and ...
Databáze:	OpenAIRE
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