By using a fluorescent 3-metoxybenzatrone probe the binding of the phenothiazine series drugs (chlorpromazine, triftazine, aethaperazine) with phospholipid vesicles--liposomes, was investigated. Cholesterol is shown not to affect the binding of these drugs with liposomes. The surface charge of liposomes influences only the combination with the chlorpromazine membranes. With a higher positive charge of the membranes the binding of chlorpromazine diminishes in force.
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