Fig. 2From: Determination of antihistaminic drugs alcaftadine and olopatadine hydrochloride via ion-pairing with eosin Y as a spectrofluorimetric and spectrophotometric probe: application to dosage formsA Excitation and emission spectra of eosin 2.5 × 10−5 M (▬) and its reaction with 1500 ng mL−1ALC (-----) B Absorbance spectra of the blank (▬) and its reaction with 6 µg mL−1 ALC - - - -, and the insert show the absorbance spectrum of the complex after subtracting the eosin blankBack to article page