Fig. 4

UV–visible spectra of EABH (60µM) [0.01 M, HEPES buffer at pH 7.4] in DMSO solution with various metal ions (40 µM). Absorption spectra of EABH on incremental addition of (b) Fe²⁺ and (c) Pb²⁺ ions indicating the interaction between EABH and Fe²⁺ / Pb²⁺.