Binary ionic iron(III) porphyrin nanostructured materials with catalase-like activity

• Type: Article in International Scientific Journal
• Date: 2020

Authors

Susana L H Rebelo (Author) FCUP; Neves, CMB (Author) Other; M. Peixoto de Almeida (Author) FCUP; Eulalia Pereira (Author) FCUP; Simoes, MMQ (Author) Other; Neves, MGPMS (Author) Other; de Castro, B (Author) Other; Medforth, CJ (Author) Other

Journal

Title: Applied Materials Today

Vol. 21

ISSN: 2352-9407

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 15 Citations

Scopus - 15 Citations

Other information

Authenticus ID: P-00S-RRD

DOI: 10.1016/j.apmt.2020.100830

Abstract (EN): Supramolecular structures were prepared in water by ionic self-assembly of oppositely charged iron(III) porphyrins and tested as a new class of catalase mimics. Iron(III) porphyrins carrying the positively charged groups, N-methyl-4-pyridinium (FeTMPyP), 4-pyridinium (FeTHPyP) and tetrafluoro-4-imidazoliumphenyl (FeTFHImP) were assembled with iron tetrakis(4-sulfonatophenyl)porphyrin (FeTSPP), at an optimized pH. The material with the best catalase activity (FeTHPyP:FeTSPP) showed 65-77 catalase units (U)/mg in the pH range 3.5-7.0, which was significantly higher than the 3 U/mg observed for the individual porphyrins. Analogous metal-free structures had no catalytic activity. Micro-scale structures with nanoscale features were observed by Scanning Electron Microscopy. Studies of the chemical composition of materials by X-ray Photoelectron Spectroscopy showed the formation of structures with a 1:1 ratio for (+):(-) tectons. Characterization of particles in solution was carried out at different pH and before and after catalysis by UV-vis spectroscopy, Dynamic Light Scattering (measurement of hydrodynamic diameters) and Electrophoretic Light Scattering (measurement of zeta potentials).

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11