A dodecyltrimethylammonium-selective electrode to measure free dextrom
ethorphan hydrobromide (M) concentrations in aqueous solution was used
. Electrode response towards this drug is about 50 mV per decade. Thus
, this electrode can be used to determine the stability constant of an
1:1 stoichiometry complex between beta-cyclodextrin and M. The value
of this constant is about 19950 at 298 K.