Facile demetallation occurs upon contact of the methemoglobin with a mesoporous TiO2 host in phosphate buffer media at pH 5.5 but not in acetate buffer media. As a result, voltammetric signals previously attributed to hemoglobin-based redox processes have to be re-interpreted. (c) 2007 Elsevier B.V. All rights reserved.
Milsom, E. V., Dash, H. A., Jerikins, A. T. A., Opallo, M., & Marken, F. (2008). Reactivity of methemoglobin immobilized on TiO2 nanoparticle films. Bioelectrochemistry, 72(1), 1-2. https://doi.org/10.1016/j.bioelechem.2007.07.006