Antimicrobial TEMPO-oxidized hemp fibers with incorporated silver particles
| Autor: | Mirjana Kostic, Jovana Milanovic, Katarina Popović, Tatjana Mihailovic |
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| Rok vydání: | 2012 |
| Předmět: |
Aqueous solution
010405 organic chemistry Chemistry antimicrobial textile Sorption 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Antimicrobial 01 natural sciences 0104 chemical sciences Catalysis lcsh:Chemistry Silver nitrate chemistry.chemical_compound Sodium bromide lcsh:QD1-999 hemp fibers Sodium hypochlorite Organic chemistry silver sorption 0210 nano-technology Antibacterial activity TEMPO-mediated oxidation Nuclear chemistry |
| Zdroj: | Journal of the Serbian Chemical Society, Vol 77, Iss 12, Pp 1759-1773 (2012) |
| ISSN: | 1820-7421 0352-5139 |
| Popis: | In this paper, the preparation of the antimicrobial silver loaded hemp fibers were carried out by 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), followed by silver sorption from aqueous silver nitrate solution. The most suitable experimental conditions for the selective TEMPO-mediated oxidation were determined by changing oxidation conditions: concentration of sodium hypochlorite and duration of sorption. The obtained results showed that the maximum sorption capacity (0.703 mmol of silver per gram of fibers) of modified hemp fibers was obtained for the sample modified with 9.67 mmol NaClO per gram of fibers, during 4 hours. SEM microphotographs of the modified hemp fibers with incorporated silver showed uniformly distributed silver particles on the surface of fibers, with isometric shapes and sizes from 10 to 100 nm, despite the fact that silver was sorbed from ionic solution. The antibacterial activity of the TEMPO-oxidized hemp fibers with silver particles was confirmed in vitro against two strains: Staphylococcus aureus (ATCC 25923) and Escherichia coli (ATCC 25922), and the antifungal activity against fungi Candida albicans (ATCC 24433). The best antimicrobial activity of silver-loaded TEMPO-oxidized hemp fibers was showed against strain Staphylococcus aureus. [Projekat Ministarstva nauke Republike Srbije, br. Acknowledgments. This study has been supported by Ministry of Education, Science and Technological Development of the Republic of Serbia, br. OI 172029] |
| Databáze: | OpenAIRE |
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