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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Wojciechowski, Kamil |
| Description | Country affiliation: Poland Author Affiliation: Wojciechowski K ( Department of Microbioanalytics, Faculty of Chemistry, Warsaw University of Technology, Warsaw, Poland. kamil.wojciechowski@ch.pw.edu.pl) |
| Abstract | Surface activity of Sigma's Quillaja bark saponin (QBS) was studied by means of dynamic interfacial tension and surface dilational rheology at three fluid/fluid interfaces with the polarity of the non-aqueous phase increasing in the order: air/water, tetradecane/water and olive oil/water. The equilibrium interfacial tension isotherms were fitted to the generalized Frumkin model with surface compressibility for the air/water and tetradecane/water interfaces, whereas the isotherm for the third interface displays a more complex shape. Upon fast compression of a drop of concentrated 'Sigma' QBS solution immersed in olive oil, a clearly visible and durable skin was formed. On the other hand, no skin formation was noticed at the air/water interface, and only a little at the tetradecane/water interface. Addition of a fatty acid, however, improved slightly the skin-formation ability of the QBS at the latter interface. The surface behavior of the QBS from Sigma was compared with that from Desert King, Int. ('Supersap'), employed in a recent study by Stanimirova et al. [22]. The two products exhibit different areas per molecule in the saturated adsorbed layer (0.37nm(2) vs. 1.19nm(2) for 'Sigma' and 'Supersap', respectively). Also their surface rheology is different: although both QBSs form predominantly elastic layers, for 'Sigma' the surface storage modulus, εr=103mNm(-1), while for 'Supersap' εr=73mNm(-1) at 10(-3)moll(-1) (i.e., around their cmc). The two saponin products exhibit also different ionic character, as proven by the acid-base titration of their aqueous solutions: QBS from Sigma is an ionic surfactant, while the 'Supersap' from Desert King is a non-ionic one. |
| File Format | HTM / HTML |
| ISSN | 09277765 |
| Volume Number | 108 |
| e-ISSN | 18734367 |
| Journal | Colloids and Surfaces B: Biointerfaces |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2013-08-01 |
| Publisher Place | Netherlands |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Chemistry Alkanes Chemistry Plant Bark Plant Oils Quillaja Saponins Quillaja Water Air Kinetics Models, Chemical Olive Oil Rheology Surface Tension Thermodynamics Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Colloid and Surface Chemistry Medicine Physical and Theoretical Chemistry Surfaces and Interfaces Biotechnology |
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