Potentiated Electron Transference in α-Ag2WO4 Microcrystals with Ag Nanofilaments as Microbial Agent

被引：104

作者：

Longo, Valeria M. ^{[1
]}

De Foggi, Camila C. ^{[2
]}

Ferrer, Mateus M. ^{[3
]}

Gouveia, Amanda F. ^{[3
]}

Andre, Rafaela S. ^{[3
]}

Avansi, Waldir ^{[3
]}

Vergani, Carlos E. ^{[2
]}

Machado, Ana L. ^{[2
]}

Andres, Juan ^{[4
]}

Cavalcante, Laecio S. ^{[5
]}

Hernandes, Antonio C. ^{[1
]}

Longo, Elson ^{[6
]}

机构：

[1] Univ Sao Paulo, INCTMN USP, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil

[2] Univ Estadual Paulista, UNESP, Dept Dent Mat & Prosthodont, BR-14801903 Araraquara, SP, Brazil

[3] Univ Fed Sao Carlos, INCTMN UFSCar, BR-13565905 Sao Carlos, SP, Brazil

[4] Univ Juame I, Dept Quim Fis Analit, Castellon de La Plana 12071, Spain

[5] Univ Estadual Piaui, CCN DQ GERATEC, BR-64002150 Teresina, PI, Brazil

[6] Univ Estadual Paulista, INCTMN UNESP, BR-14801907 Araraquara, SP, Brazil

来源：

JOURNAL OF PHYSICAL CHEMISTRY A | 2014年 / 118卷 / 31期

基金：

巴西圣保罗研究基金会;

关键词：

SILVER NANOPARTICLES; STAPHYLOCOCCUS-AUREUS; METHICILLIN-RESISTANT; ANTIBACTERIAL ACTIVITY; TUNGSTATE; RELEASE; VANCOMYCIN; FILAMENTS; MORTALITY; TOXICITY;

D O I：

10.1021/jp410564p

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This study is a framework proposal for understanding the antimicrobacterial effect of both alpha-Ag2WO4 microcrystals (AWO) synthesized using a microwave hydrothermal (MH) method and alpha-Ag2WO4 microcrystals with Ag metallic nanofilarnents (AWO:Ag) obtained by irradiation employing an electron beam to combat against planktonic cells of methicillin-resistant Staphylococcus aureus (MRSA). These samples were characterized by X-ray diffraction (XRD), FT-Raman spectroscopy, ultraviolet visible (UV-vis) measurements, field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and high resolution transmission electron microscopy (HRTEM). The results reveal that both AWO and AWO:Ag solutions have bacteriostatic and bactericidal effects, but the irradiated sample is more efficient; i.e., a 4-fold of the MRSA planktonic cells as compared to the nonirradiated sample was observed. In addition, first principles calculations were performed to obtain structural and electronic properties of AWO and metallic Ag, which provides strong quantitative support for an antimicrobacterial mechanism based on the enhancement of electron transfer processes between alpha-Ag2WO4 and Ag nanoparticles.

引用

页码：5769 / 5778

页数：10

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