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

Autor: Vasylevskyi SI; Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700, Fribourg, Switzerland., Kracht S; Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700, Fribourg, Switzerland., Corcosa P; Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700, Fribourg, Switzerland., Fromm KM; Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700, Fribourg, Switzerland., Giese B; Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700, Fribourg, Switzerland., Füeg M; Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012, Bern, Switzerland.
Jazyk: angličtina
Zdroj: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2017 May 15; Vol. 56 (21), pp. 5926-5930. Date of Electronic Publication: 2017 Apr 21.
DOI: 10.1002/anie.201702621
Abstrakt: The reduction of Ag + ions to Ag 0 atoms is a highly endergonic reaction step, only the aggregation to Ag n 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 Fe 2+ /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 lysine2+ /hemes of c-cytochromes to reduce Ag + to AgNPs was studied in an enzymatic experiment and with living bacteria Geobacter sulfurreducens (Gs).
(© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Databáze: MEDLINE
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