Fig. 5From: Determination of antihistaminic drugs alcaftadine and olopatadine hydrochloride via ion-pairing with eosin Y as a spectrofluorimetric and spectrophotometric probe: application to dosage formsEffect of acetate buffer pH on the reaction of eosin (5 × 10−4 M) with 1200 ng mL−1 OLO for spectrofluorometric method (-▲-) and eosin (1 × 10−3 M) with 6 µ gmL−1 OLO for spectrophotometric method (-■-)Back to article page