Abstract：
:The antimicrobial properties of copper ions have been known for a long time. However, the exact mechanism of action of the transition metal on microorganisms has long been unclear. X-ray absorption near-edge structure (XANES) spectroscopy at the Cu K edge allows the determination of copper speciation in Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa that have been treated with Cu(II) and Cu(I) solutions. The death/inactivation of the bacteria was observed using plate counting and light microscopy. The Cu K-XANES spectra of the two Gram-negative bacteria are different than those of the Gram-positive strain. The results clearly show that the Cu+-S bond contributes to the antibacterial activity of copper, as in the case of silver. The detailed evaluation of the differentiated absorption spectra shows that Cu+ (not Cu2+) is the dominant ion that binds to the bacteria. Because Cu+ is not the most common copper ion, copper is not as effective an antibacterial agent as silver, whose common valency is actually + 1. Any reaction of copper with phosphorus from the bacteria can be excluded after the evaluation of the absorption spectra.
journal_name
Arch Microbioljournal_title
Archives of microbiologyauthors
Zanzen U,Bovenkamp-Langlois L,Klysubun W,Hormes J,Prange Adoi
10.1007/s00203-017-1454-2subject
Has Abstractpub_date
2018-04-01 00:00:00pages
401-412issue
3eissn
0302-8933issn
1432-072Xpii
10.1007/s00203-017-1454-2journal_volume
200pub_type
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