3 years ago

Formation of Silver Nanoparticles by Electron Transfer in Peptides and c-Cytochromes

Formation of Silver Nanoparticles by Electron Transfer in Peptides and c-Cytochromes
Katharina M. Fromm, Serhii I. Vasylevskyi, Bernd Giese, Michael Füeg, Paula Corcosa, Sonja Kracht
The reduction of Ag+ ions to Ag0 atoms is a highly endergonic reaction step, only the aggregation to Agn clusters leads to an exergonic process. These elementary chemical reactions play a decisive role if Ag nanoparticles (AgNPs) are generated by electron transfer (ET) reactions to Ag+ ions. We studied the formation of AgNPs in peptides by photoinduced ET, and in c-cytochromes by ET from their Fe2+/hemes. Our earlier photoinduced experiments in peptides had demonstrated that histidine prevents AgNP formation. We have now observed that AgNPs can be easily synthesized with less-efficient Ag+-binding amino acids, and the rate increases in the order lysine

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201702621

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