engleski

Interaction of p-nitrophenol with lipids at hidrophobic interfaces

Adsorption of p-nitrophenol (PNP) at two model hydrophobic interfaces, namely at air/solution interface and mercury electrode/solution interface, as well as its interaction with neutral and charged lipids has been studied in monolayers by light reflection spectroscopy and electrochemical methods. Investigations have been performed at pH=10 and pH=11 wher the dissociated form of PNP carrying a negative charge is predominant. In this pH region no accumulation of PNP from bulk solution to the free air/solution interface and slight adsorption at mercury surface was observed. PNP also does not accumulate in neutral phospholipid monolayers spread at the air/solution interface while phospholipid layers formed at mercury by adsorption from the bulk solution cause the inhibition of electrochemical reduction of PNP. The attachment of PNP to the neutral phospholipid layer is enhanced and accelerated at both interfaces by the presence of quarternary ammonium salts in the solution.

p-nitrophenol; lipids; interaction; hydrophobic effect; monolayers; voltammetry

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