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- Title
Antimicrobial activity and controlled release of nanosilvers in bacterial cellulose composites films incorporated with montmorillonites.
- Authors
Li, Yi-Tsen; Lin, Shih-Bin; Chen, Li-Chen; Chen, Hui-Huang
- Abstract
Silver nanoparticles (AgNPs) were synthesized by NaBH reduction and loaded in the dry-fabricated biofilm (DFBF) or the interlayer space of montmorillonite (MMT), generating AgNPs/DFBF or AgNPs/MMT composites, respectively. Use of NaBH at lower concentrations resulted in smaller the derived AgNPs, which exhibited superior antimicrobial activity against Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa. Transmission electron microscopy images revealed conformation of AgNPs in DFBF and MMT with sizes of 20-160 and 2 nm, respectively. The results suggested that AgNPs were immobilized more firmly in MMT than in DFBF, which prevented the flocculation of AgNPs. The adsorption of AgNPs/MMT composites on DFBF resulted in the formation of AgNPs/MMT/DFBF composites, which further inhibited AgNPs migration. Furthermore, the silver release ratios of the AgNPs/DFBF, AgNPs/MMT, and AgNPs/MMT/DFBF composites were 6.7, 1.05, and 0.414% within 48 h, respectively. The minimum inhibitory concentration of silver in the medium for the AgNPs/MMT/DFBF composite against S. aureus was as low as 0.30 μg/mL; thus, AgNPs/MMT/DFBF composite films are suitable candidates for applications in sustained-release antimicrobial dressings.
- Subjects
CELLULOSE; SILVER nanoparticles; MONTMORILLONITE; BIOFILMS; STAPHYLOCOCCUS aureus; ANTI-infective agents
- Publication
Cellulose, 2017, Vol 24, Issue 11, p4871
- ISSN
0969-0239
- Publication type
Article
- DOI
10.1007/s10570-017-1487-3