Silver-loaded lyocell fibers modified by tempo-mediated oxidation

The purpose of this research was to accomplish antimicrobial properties in lyocell fibers by Ag⁺ ions sorption from aqueous silver nitrate solution. Sorption properties of lyocell fibers were improved by the selective TEMPO-mediated oxidation, i.e. oxidation with sodium hypochlorite and catalytic am...

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Bibliographic Details
Published in:Journal of applied polymer science 2010-08, Vol.117 (3), p.1772-1779
Main Authors: Praskalo-Milanovic, J.Z, Kostic, M.M, Dimitrijevic-Brankovic, S.I, Skundric, P.D
Format: Article
Language:English
Subjects:
antimicrobial activity
Applied sciences
Candida albicans
Escherichia coli
Exact sciences and technology
Fibers and threads
Forms of application and semi-finished materials
lyocell fibers
Polymer industry, paints, wood
silver ion sorption
Staphylococcus aureus
swelling
Technology of polymers
TEMPO-modification
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Summary:The purpose of this research was to accomplish antimicrobial properties in lyocell fibers by Ag⁺ ions sorption from aqueous silver nitrate solution. Sorption properties of lyocell fibers were improved by the selective TEMPO-mediated oxidation, i.e. oxidation with sodium hypochlorite and catalytic amount of sodium bromide and 2,2,6,6-tetramethylpiperidine-1-oxy radical (TEMPO). The most suitable experimental conditions for the selective TEMPO-mediated oxidation were determined by changing oxidation conditions: concentration of sodium hypochlorite, as well as duration of sorption. The obtained results showed that the maximum sorption capacity (0.809 mmol of Ag⁺ ions per gram of fibers) of modified lyocell fibers was obtained for the sample modified with 4.84 mmol NaClO per gram of cellulose, during 1 h. The antifungal activity of the TEMPO-oxidized lyocell fibers with silver ions against fungi from the Candida family, Candida albicans (ATCC 24433), and antibacterial activity against two strains: Staphylococcus aureus (ATCC 25923) and Escherichia coli (ATCC 25922) were confirmed in vitro.
ISSN:0021-8995
1097-4628
1097-4628
DOI:10.1002/app.32128