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Darka Marković,Jelena Ašanin,Tim Nunney,Željko Radovanović,Marija Radoičić,Miodrag Mitrić,Dušan Mišić,Maja Radetić 한국섬유공학회 2019 Fibers and polymers Vol.20 No.11
This study discusses the possibility of fabrication of textile nanocomposites with antimicrobial activity againstantibiotics-resistant bacterial strains and yeast. Modification of cotton fabric with oxalic acid solutions of differentconcentrations provided free carboxyl groups for binding of Cu2+-ions from copper (II) sulfate solution which were furtherreduced with sodium borohydride in alkaline solution. An increase in the concentration of applied oxalic acid resulted inlarger amounts of free carboxyl groups on the cotton fibers, Cu2+-ions uptake and total amounts of Cu-based nanoparticlesafter reduction. XPS and XRD analyses suggested that nanoparticles mainly consisted of CuO with fractions of Cu2O. Fabricated textile nanocomposites ensured maximum reduction of Gram-negative E. coli ATCC 25922, E. coli NCTC 13846,E. coli ATCC BAA-2469, K. pneumoniae ATCC-BAA 2146 and P. aeruginosa ATCC 27853, Gram-positive bacteria S. aureus ATCC 25923 and S. aureus ATCC 43300 and yeast C. albicans ATCC 24433. Additionally, controlled release ofCu2+-ions from fabrics into the physiological saline solution was obtained within 24 hours.
Ana Krkobabić,Darka Marković,Aleksandar Kovačević,Vanja Tadić,Marija Radoičić,Tatjana Barudžija,Tatjana Ilic-Tomic,Maja Radetić 한국섬유공학회 2022 Fibers and polymers Vol.23 No.4
The aim of this study was to develop antimicrobial nanocomposite textile material comprising of Cu-basednanostructures synthesized on oxidized cotton fabric using Arctostaphylos uva-ursi (L.) Spreng., Ericaceae (bearberry leaves)as a green reducing agent for adsorbed Cu2+-ions. In order to provide sufficient number of carboxyl groups for complexationwith Cu2+-ions a two-step oxidation process with NaIO4 and NaClO2 was carried out. The influence of NaIO4 concentrationon content of carboxyl groups and Cu-based nanoparticles was studied by FTIR and AAS. HPLC analysis identified thegallic acid known as a reducing agent in bearberry leaves extract. FESEM and XRD analyses revealed that using bearberryleaves extract and gallic acid solution as reducing agents led to a formation of spherical Cu2O/CuO nanoparticles and CuOnanosheets, respectively. These nanoparticles and nanosheets provided excellent antibacterial activity against Gram-negativebacteria Escherichia coli and Gram-positive bacteria Staphylococcus aureus. Cytotoxicity on human keratinocyte cells wasshown to depend on their copper content.