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• W2031624986 abstract "The effects of the plant glycosides saponin as well as digitonin on the electrical conductance of black lipid membranes and the effect of these agents on the surface pressure of lipid monofilms was investigated. Both saponin and digitonin induced channel-like fluctuations in planar bilayers made either of diphytanoylphosphatidylcholine (DPhPC) or of DPhPC and cholesterol 2:1 (w/w). In cholesterol-free bilayers the amount needed to induce an increase in conductance was 0.3–1 mg/ml for saponin and about 0.2 mg/ml for digitonin. In contrast, in cholesterol-containing bilayers the concentration needed to induce pores was about 10 μg/ml for both saponin and digitonin. In cholesterol-containing membranes the fluctuating pores induced by saponin were about 3-times more permeable to K+ than to Cl− and the microscopic current showed an ohmic behaviour. Surface pressure experiments demonstrate that both glycosides could penetrate into lipid monofilms of pure DPhPC spread at the air/water interface with an initial surface pressure of 30 mN/m. The increase in surface pressure was considerably enhanced in cholesterol-containing films. It is assumed that the channel-like fluctuations induced by saponin as well as digitonin, in both cholesterol-free and cholesterol-rich bilayers are due to the formation of micellar structures within the lipid lattice. Probably the penetration of the glycosides into the lipid bilayer is considerably enhanced by the presence of cholesterol." @default.
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• W2031624986 date "1984-06-01" @default.
• W2031624986 modified "2023-09-28" @default.
• W2031624986 title "Interaction of saponin and digitonin with black lipid membranes and lipid monolayers" @default.
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• W2031624986 doi "https://doi.org/10.1016/0005-2736(84)90547-9" @default.
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