Light Irradiation Is a Factor in the Bactericidal Activity of Silver-Loaded Zeolite

Inoué, Yoshihiro; Kogure, Makoto; Matsumoto, Ken‐ichiro; Hamashima, Hajime; Tsukada, Masamichi; Endo, Kazutoyo; Tanaka, Tatsuo

doi:10.1248/cpb.56.692

Cited by 15 publications

(9 citation statements)

References 6 publications

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“…This is affected by the presence of Ag + -ions which are incorporated and dispersed into the material. It was not only the concentration of the activating agent, since zeolite had the lowest sorption capacity for Ag + -ions, comparing with GAC and T sorbents, as presented in Table 1, but also the accessibility and distribution of Ag + -ions resulted in the efficient antimicrobial activity [5].…”

Section: Antimicrobial Activity Of Ag + -Activated Sorbentsmentioning

confidence: 99%

The antimicrobial efficiency of silver activated sorbents

Đolić

Rajaković-Ognjanović

Štrbac

et al. 2015

Applied Surface Science

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This study is focused on the surface modifications of the materials that are used for antimicrobial water treatment. Sorbents of different origin were activated by Ag + -ions. The selection of the most appropriate materials and the most effective activation agents was done according to the results of the sorption and desorption kinetic studies. Sorption capacities of selected sorbents: granulated activated carbon (GAC), zeolite (Z), and titanium dioxide (T), activated by Ag + -ions, were following: 42.06, 13.51 and 17.53 mg/g, respectively. The antimicrobial activity of Ag/Z, Ag/GAC and Ag/T sorbents were tested against Gram-negative bacteria E. coli, Gram-positive bacteria S. aureus and yeast C. albicans. After 15 min of exposure period, the highest cell removal was obtained using Ag/Z against S.aureus and E. coli, 98.8 and 93.5 %, respectively. Yeast cell inactivation was unsatisfactory for all three activated sorbents. The antimicrobial pathway of the activated sorbents has been examined by two separate tests -Ag + -ions desorbed from the activated surface to the aqueous phase and microbial cell removal caused by the Ag + -ions from the solid phase (activated surface sites). The results indicated that disinfection process significantly depended on the microbial-activated sites interactions on the modified surface. The chemical state of the activating agent had crucial impact to the inhibition rate. The characterization of the native and modified sorbents was performed by X-ray diffraction technique, X-ray photo electron spectroscopy and scanning electron microscope. The concentration of A c c e p t e d M a n u s c r i p t adsorbed and released ions was determined by inductively coupled plasma optical emission spectroscopy and mass spectrometry. The antimicrobial efficiency of activated sorbents was related not only to the concentration of the activating agent, but moreover on the surface characteristics of the material, which affects the distribution and the accessibility of the activating agent.

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Section: Antimicrobial Activity Of Ag + -Activated Sorbentsmentioning

confidence: 99%

The antimicrobial efficiency of silver activated sorbents

Đolić

Rajaković-Ognjanović

Štrbac

et al. 2015

Applied Surface Science

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“…As compared with the organic ones, inorganic antibacterial materials have advantages in terms of the durability, safety, chemical stability and thermal resistance [1][2][3][4]. These materials are generally based in metallic ions, such as Ag + , Cu 2+ and Zn 2+ , among which silver is well known to have a great and broad spectrum antibacterial activity and relatively high safety [5][6][7][8][9]. Recently, various antibacterial materials containing silver, such as Agmontmorillonite, Ag-zeolite, Ag-SiO 2 and Ag-polymer fibers have been prepared [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

The antibacterial activity and mechanism of mussel shell waste derived material

Yao

Chen

et al. 2014

Powder Technology

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“…Light is necessary to elicit the antibacterial activity of Ag-Z [9]. We focused on the oxidation state of silver in this study because light irradiation may lead to the reduction of silver ions in systems containing Ag-Z.…”

Section: Resultsmentioning

confidence: 99%

“…Ag-Z in water causes dissolved dioxygen to form reactive oxygen species. We also reported that light irradiation was necessary to form reactive oxygen species [9].…”

Section: Introductionmentioning

confidence: 90%

Electrochemical Analysis of the Redox State of Silver Contained in Antibacterial Material

Inoué

Hamashima²

2012

JBNB

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Introduction of silver into some inorganic material causes the resulting mixture to have antibacterial activity. Here, we investigated the role of silver in the bactericidal activity of silver-loaded zeolite, by measuring the effects of silver-loaded zeolite on Escherichia coli cell viability under conditions in which the oxidation state of the silver was controlled electrochemically. Bactericidal activity was observed when the sweeping voltage between 0 and 0.7 V was applied to the silver electrode. When nitrogen gas bubbling or reactive oxygen scavengers were added to the experimental system, bactericidal activity decreased. These results indicated that the redox cycle, Ag0 <—> Ag+, caused the dissolved oxygen to form reactive oxygen species

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Light Irradiation Is a Factor in the Bactericidal Activity of Silver-Loaded Zeolite

Cited by 15 publications

References 6 publications

The antimicrobial efficiency of silver activated sorbents

The antimicrobial efficiency of silver activated sorbents

The antibacterial activity and mechanism of mussel shell waste derived material

Electrochemical Analysis of the Redox State of Silver Contained in Antibacterial Material

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