Histamine release in dogs by Cremophor El® and its derivatives: Oxethylated oleic acid is the most effective constituent

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Abstract
Several preparations of Cremophor El®, several of other non-ionic detergents and several components of Cremophor El were tested for their histamine-releasing capacity in dogs. Lutensol AP 10 and a derivative of 1,2-propylenglycol were ineffective, but showed excellent properties as detergents. Thus the histamine-releasing capacity was not necessarily combined with the tenside effect of the surfactants. Oleic acid found in Tween 80 as well as in Cremophor El seems to be the most effective constituent, but the alcohol seems also to be important for the histamine-releasing capacity. The development of a non-toxic solubilizer for lipophilic drugs seems of considerable clinical interest.