Jonas, Ulrich
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Publication Access status: Metadata only , Antimicrobial Peptide SAAP‐148‐Functionalized Hydrogels from Photocrosslinkable Polymers with Broad Antibacterial ActivityAntimicrobial peptides (AMPs) are promising alternatives to traditional antibiotics for treating skin wound infections. Nonetheless, their short half‐life in biological environments restricts clinical applicability. Covalent immobilization of AMPs onto suitable substrates offers a comprehensive solution, creating contact‐killing surfaces with long‐term functionality. Here, a copolymer of poly[(hydroxy ethyl acrylamide)‐ co ‐(4‐benzophenone acrylamide)‐ co ‐(pentafluorophenyl acrylate)‐ co ‐(ECOSURF EH‐3 acrylate)], in short poly(HEAAm‐ co ‐BPAAm‐ co ‐PFPA‐ co ‐EH3A), is synthesized by free radical polymerization. Subsequent modification of active ester groups with the amine groups of SAAP‐148, results in a copolymer, that is non‐cytotoxic to human lung fibroblasts. UV photocrosslinking of the benzophenone units yields a polymer network that forms a hydrogel after swelling with aqueous medium. Both the SAAP‐148‐modified polymer in solution and the photocrosslinked hydrogels show good antimicrobial activity against strains of Escherichia coli , Staphylococcus aureus , Pseudomonas aeruginosa , and Acinetobacter baumannii , including multidrug‐resistant strains, frequently found in wound infections. The covalent attachment of SAAP‐148 prevents leaching, ensuring sustained antimicrobial activity for at least 48 h in diluted human blood plasma and 14 days in PBS. This prolonged retention of antimicrobial activity in human blood plasma significantly enhances its clinical potential. Overall, this study shows the potential of the AMP‐functionalized photocrosslinkable polymer as antimicrobial wound dressings, providing an effective alternative to antibiotics.Source Type:Article1 - Some of the metrics are blocked by yourconsent settings
Publication Access status: Metadata only , Thermoresponsive and Photocrosslinkable Poly(2‐alkyl‐2‐oxazoline) Toolbox – Customizable Ultralow‐Fouling Hydrogel Coatings for Blood Plasma EnvironmentsThis study focuses on developing surface coatings with excellent antifouling properties, crucial for applications in the medical, biological, and technical fields, for materials and devices in direct contact with living tissues and bodily fluids such as blood. This approach combines thermoresponsive poly(2‐alkyl‐2‐oxazoline)s, known for their inherent protein‐repellent characteristics, with established antifouling motifs based on betaines. The polymer framework is constructed from various monomer types, including a novel benzophenone‐modified 2‐oxazoline for photocrosslinking and an azide‐functionalized 2‐oxazoline, allowing subsequent modification with alkyne‐substituted antifouling motifs through copper(I)‐catalyzed azide‐alkyne cycloaddition. From these polymers surface‐attached networks are created on benzophenone‐modified gold substrates via photocrosslinking, resulting in hydrogel coatings with several micrometers thickness when swollen with aqueous media. Given that poly(2‐alkyl‐2‐oxazoline)s can exhibit a lower critical solution temperature in water, their temperature‐dependent solubility is compared to the swelling behavior of the surface‐attached hydrogels upon thermal stimulation. The antifouling performance of these hydrogel coatings in contact with human blood plasma is further evaluated by surface plasmon resonance and optical waveguide spectroscopy. All surfaces demonstrate extremely low retention of blood plasma components, even with undiluted plasma. Notably, hydrogel layers with sulfobetaine moieties allow efficient penetration by plasma components, which can then be easily removed by rinsing with buffer.Source Type:Article2
