Fig. 2

(a, a*) The excitation and emission spectra, respectively, of (1 × 10^− 4M) erythrosine B (EB) in Britton Robinson (BR) buffer (pH 4) without the addition of the analyte. (b, b*) The excitation and emission spectra, respectively, of the reaction product of (1 × 10^− 4 M) EB and VER (0.4 µg/mL) in BR buffer (pH 4)