Abstract: The theranostic wound dressing that combines diagnostic functions with therapeutic actions, including the targeted release of antibiotics, which enhances treatment efficiency and reduces the likelihood of prolonged infections or the development of antibiotic resistance. The present invention provides a theranostic wound dressing, that includes citric acid and a modified hemicyanine dye immobilized within polymer nanofibers formed as a nanofibrous matrix, the matrix immobilizing nanoparticles encapsulating at least one antimicrobial compound. The nanoparticles are structurally responsive to reactive oxygen species (ROS) to effectively release an antimicrobial. The hemicyanine dye is adapted to react with a color-change in the presence of pathogenic enzymes. Ester bonds present in the hemicyanine dye are cleavable by pathogenic enzymes secreted by pathogenic bacteria and fungi.

Abstract: A biosensor for real-time monitoring of a wound can provide valuable data regarding the presence of bacteria. A nanofibrous biosensor is provided for monitoring wound status at the point of care. The colorimetric biosensor changes color in response to low levels of bacteria and fungi, making it visible to unaided and untrained eyes. A colorimetric probe is a hemicyanine dye that changes color from yellow to green in the presence of lipase. Dye is incorporated into a shell composition of core-shell nanofibers made of polyurethane and polyvinylpyrrolidone. As a means of increasing the biosensor's sensitivity, the alignment of nanofibers is controlled and a surfactant added to the shell (e.g., Tween 80). Alignment of nanofiber enables better localization, and Tween 80 increases lipase activity, which facilitates near immediate color changes above critical levels of Staphylococcus aureus, Pseudomonas aeruginosa, Candida albicans, and Candida aureus. All ESKAPEE bacteria are detected within 2 hours.

Abstract: A bacteria-responsive color-changing, core-shell nanofiber, comprising polyurethane (PU), a hemicyanine-based chromogenic probe localized in the core-shell nanofiber near the surface of the shell, polyvinylpyrrolidone (PVP) dopant in the shell, the hemicyanine-based chromogenic probe further comprising a labile ester linkage that is enzymatically cleavable by bacterial lipase released from clinically relevant strains of bacteria including Pseudomonas aeruginosa and methicillin-resistant Staphylococcus aureus (MRSA).

Abstract: A biosensor for real-time monitoring of a wound can provide valuable data regarding the presence of bacteria. A nanofibrous biosensor is provided for monitoring wound status at the point of care. The colorimetric biosensor changes color in response to low levels of bacteria and fungi, making it visible to unaided and untrained eyes. A colorimetric probe is a hemicyanine dye that changes color from yellow to green in the presence of lipase. Dye is incorporated into a shell composition of core-shell nanofibers made of polyurethane and polyvinylpyrrolidone. As a means of increasing the biosensor's sensitivity, the alignment of nanofibers is controlled and a surfactant added to the shell (e.g., Tween 80). Alignment of nanofiber enables better localization, and Tween 80 increases lipase activity, which facilitates near immediate color changes above critical levels of Staphylococcus aureus, Pseudomonas aeruginosa, Candida albicans, and Candida aureus. All ESKAPEE bacteria are detected within 2 hours.

Abstract: Bacteria-responsive core-shell nanofibers and a process for the preparation thereof are described. The nanofibers release of an antibacterial agent in response to the presence of bacteria. The core of the nanofiber comprises a biocompatible polymer together with an antibacterial agent such as a quaternary ammonium compound, for example benzyl dimethyl tetradecyl ammonium chloride (BTAC). Surrounding the core is shell comprised of a bacterially degradable polymer, which is susceptible to break-down by bacterial enzymes such as lipase, or to acidic pH conditions. The shell may comprise, for example, polycaprolactone (PCL) and poly(ethylene succinate) (PES). The nanofibers may be incorporated into wound dressings.

Abstract: A bacteria-responsive color-changing, core-shell nanofiber, comprising polyurethane (PU), a hemicyanine-based chromogenic probe localized in the core-shell nanofiber near the surface of the shell, polyvinylpyrrolidone (PVP) dopant in the shell, the hemicyanine-based chromogenic probe further comprising a labile ester linkage that is enzymatically cleavable by bacterial lipase released from clinically relevant strains of bacteria including Pseudomonas aeruginosa and methicillin-resistant Staphylococcus aureus (MRSA).

Abstract: Bacteria-responsive core-shell nanofibers and a process for the preparation thereof are described. The nanofibers release of an antibacterial agent in response to the presence of bacteria. The core of the nanofiber comprises a biocompatible polymer together with an antibacterial agent such as a quaternary ammonium compound, for example benzyl dimethyl tetradecyl ammonium chloride (BTAC). Surrounding the core is shell comprised of a bacterially degradable polymer, which is susceptible to break-down by bacterial enzymes such as lipase, or to acidic pH conditions. The shell may comprise, for example, polycaprolactone (PCL) and poly(ethylene succinate) (PES). The nanofibers may be incorporated into wound dressings.

Abstract: Bacteria-responsive core-shell nanofibers and a process for the preparation thereof are described. The nanofibers release of an antibacterial agent in response to the presence of bacteria. The core of the nanofiber comprises a biocompatible polymer together with an antibacterial agent such as a quaternary ammonium compound, for example benzyl dimethyl tetradecyl ammonium chloride (BTAC). Surrounding the core is shell comprised of a bacterially degradable polymer, which is susceptible to break-down by bacterial enzymes such as lipase, or to acidic pH conditions. The shell may comprise, for example, polycaprolactone (PCL) and poly(ethylene succinate) (PES). The nanofibers may be incorporated into wound dressings.

Abstract: Bacteria-responsive core-shell nanofibers and a process for the preparation thereof are described. The nanofibers release of an antibacterial agent in response to the presence of bacteria. The core of the nanofiber comprises a biocompatible polymer together with an antibacterial agent such as a quaternary ammonium compound, for example benzyl dimethyl tetradecyl ammonium chloride (BTAC). Surrounding the core is shell comprised of a bacterially degradable polymer, which is susceptible to break-down by bacterial enzymes such as lipase, or to acidic pH conditions. The shell may comprise, for example, polycaprolactone (PCL) and poly(ethylene succinate) (PES).

Abstract: A method for preparing a hydrogel coating for a wound dressing to provide the wound dressing with non-adhesion properties without interfering with the bioactivity of the agents contained in the wound dressing. The hydrogel coating is formed by treating the substrate with O2 plasma before applying a hydrogel precursor solution onto the substrate, and then curing the hydrogel precursor onto the substrate to form the hydrogel coating on the surface of the substrate. Hydrogel coatings for a wound dressing and wound dressings having a hydrogel coating are further described.