Abstract
The surface tension-solution concentration plots (γ-log C) of two amphoteric surfactants (cocoamphodiacetate-Miranol C2M and lauroamphodiacetate-Miranol MHT) reveal that Miranol MHT displays higher surface activity than does Miranol C2M. Both surfactants can penetrate into phospholipid Lipoid E-80 monolayers but the extent of this penetration was higher with Miranol MHT. The collapse pressure observed in the presence of this surfactant was 62.5 mN m-1, and was much higher than that of the phospholipid monolayer in the absence of surfactant (42.72 mN m-1). The phospholipid-Miranol C2M system exhibited a collapse pressure equal to 51.4 mN m-1. Increasing subphase pH resulted in a significant decrease in the monolayer collapse surface pressure with a concomitant decrease in the mean molecular area. The presence of calcium ions (20 mM) in the subphase increased surface collapse pressures and mean molecular areas of the phospholipid monolayer. However, when this monolayer was spread at the aqueous subphase containing both calcium ions and Miranol molecules, a considerable reduction of the calcium ion effect on the compressional behaviour of the phospholipid monolayers was observed.
Original language | English |
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Pages (from-to) | 149-155 |
Number of pages | 7 |
Journal | Colloids and Surfaces B: Biointerfaces |
Volume | 1 |
Issue number | 3 |
DOIs | |
State | Published - 24 Aug 1993 |
Keywords
- Cocoamphodiacetate
- Lauroamphodiacetate
- Phospholipid