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Designing biocompatible nanofibrous mats capable of preventing microbial colonization from resident and nosocomial bacteria for an extended period remains an unmet clinical need. In the present work, we designed antibiotic free durable antimicrobial nanofiber mats by taking advantage of synergistic interactions between polydopamine (pDA) and metal ions with varying degree of antimicrobial properties (Ag+, Mg2+, Ca2+, and Zn2+). Microscopic analysis showed successful pDA-mediated cross-linking of the gelatin nanofibers, which further improved by the inclusion of Ag+, Mg2+, and Ca2+ ions as supported by mechanical and thermal studies. Spectroscopic results reinforce the presence of strong interactions between pDA and metal ions in the composite nanofibers, leading to generation of robust polymeric nanofibers. We further showed that strong pDA–Ag interactions attenuated the cell cytotoxicity and anticell proliferative properties of silver ions for immortalized keratinocytes and primary human dermal fibroblas...

Combating Microbial Contamination with Robust Polymeric Nanofibers: Elemental Effect on the Mussel-Inspired Cross-Linking of Electrospun Gelatin