As the multidrug-resistant (MDR) microorganism caused by antibiotics abuse has posed a serious threat to human health and even life security
it is of great significance to study and develop new antibacterial materials for the treatment of MDR microbial infection. Silver nanoparticles (AgNPs) are prevalent choices for biomedical applications due to their robust antimicrobial activity against bacteria and fungus
especially the MDR microorganism
while their synthesis
via
environmentally friendly approaches remains challengeable. On the other hand
it has been increasingly valued to investigate the incorporation of AgNPs into collagen
for as-fabricated nanocomposite wound dressing can be tailored with unique biological functions
excellent biocompatibility
weak antigenicity
favorable biodegradability
and effective antibacterial activity. Herein
dialdehyde amylose (DA) with different aldehyde contents was firstly prepared by controlling the amount of sodium periodate added
and AgNPs were subsequently synthesized using the DA obtained as both eco-friendly reducing agent and stabilizer. With collagen dressing swollen directly into the DA-AgNPs aqueous solution
the final product of collagen-based antibacterial dressing (AgNPs-Col) could be afforded after freeze-drying. It is worth noting that collagen could be crosslinked by DA
via
Schiff’s base reaction in the process of AgNPs incorporation. In-depth exploration revealed that partially oxidized DA functioned as both a reducing agent and a stabilizer to transform AgNO
3
into AgNPs after heating for 150 min
and the participation of AgNPs into DA crosslinking process endowed AgNPs-Col dressing with a dense microstructure. In addition to the desirable decrease in porosity
water absorption rate
and vapor transmission rate
as-fabricated composite dressing also demonstrated a shape memory behavior as well as repeatability between swelling and physical pressing. More importantly
AgNPs-Col dressing exhibited a strong antibacterial activity against both Gram-positive and Gram-negative bacteria while serving as a robust barrier to bacterial infiltration in the meantime. Together with an excellent performance in blood compatibility
the AgNPs-Col antibacterial dressing developed in this work has promising application prospects in the field of biomedical applications.
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