Percorrer por autor "Bettencourt, Ana F."
A mostrar 1 - 4 de 4
Resultados por página
Opções de ordenação
- Exploring alginate/zinc oxide-based 3D-printed structures for application as customizable wound dressingsPublication . Cardoso, Sara; Martin, Victor; Leal, Catarina; Monge, Nuno; Colaço, Bruno; Gomes, Pedro; Bettencourt, Ana F.; Ribeiro, Isabel A.C.Chronic wounds represent a significant global healthcare burden due to the limited effectiveness of current therapeutic strategies. To address this critical need, we developed 3D-printed regenerative wound dressings that can be customized with antimicrobial drugs tailored to individual patient requirements. A novel semisolid extrusion ink combining the biocompatibility and printing properties of alginate (Alg) with the regenerative properties of zinc oxide (ZnO) and hydroxypropyl cellulose (HPC) was produced. Two types of dressings were successfully printed by varying the concentrations of ZnO and HPC: ZnO:HPC at 11:10 and 20:20 % (w/v). Both inks presented an adequate rheological shear-thinning behavior, resulting in wound dressings with a stable matrix structure. Moreover, to grant antimicrobial and antibiofilm activity, an octenidine (OCT)-hydrogel was loaded into the dressing’s macropores. The unloaded dressings with ZnO at 20 % (w/v) and all the OCT-loaded dressings presented antibiofilm activity, showing a biofilm reduction of ~ 75 % against S. aureus. In vitro cellular assays indicated that the unloaded dressings provided regenerative potential by showing wound closure approximately completed in 48 h, highlighting the regenerative potential of the Alg:ZnO:HPC ink. These dressings exhibited in vitro and in vivo cytocompatibility, along with regenerative potential evidenced by collagen deposition and rapid wound closure. OCT-loaded matrices retained the regenerative potential and biocompatibility of the unloaded dressings, supporting their suitability as a platform for advanced wound management.
- In vitro cytocompatibility evaluation of poly(DL-lactic acid) scaffolds loaded with minocycline and voriconazole addressing osteomyelitisPublication . Zegre, Miguel; Gonçalves, Lídia M.; Caetano, Liliana Aranha; Bettencourt, Ana F.Purpose: In this work is proposed the cytocompatibility evaluation of an innovative system based on the dual delivery of minocycline (Min) and voriconazole (Vor), aiming for bone infection therapeutics.
- Poly(DL-lactic acid) scaffolds adsorbed with minocycline and voriconazole: a new pathway towards infection containmentPublication . Zegre, Miguel; Henriques, M.; Santos, C.; Ribeiro, I. A.; Caetano, Liliana Aranha; Gonçalves, Lídia M.; Bettencourt, Ana F.Bone infection (osteomyelitis): burden as a clinical complication of orthopedic surgeries. Controlled antimicrobial release systems: treat and prevent osteomyelitis. Biomaterials based on porous scaffolds: local administration of high concentration of drugs; no systemic toxicity; extended time. Scaffolds in bone tissue engineering: a combination of bioresorbable polymers with bioactive bioglasses; present biodegradability and biosafety; suitable microenvironment and structure; favor osteogenic differentiation and cell growth. Co-encapsulation of drugs: advantageous means for administration of drugs; novel strategy directed to the co-delivery of two antimicrobials (voriconazole and minocycline).
- Release kinetic model and antimicrobial activity of an innovative minocycline and voriconazole co-delivery systemPublication . Zegre, Miguel; Henriques, M.; Ribeiro, I. A.; Caetano, Liliana Aranha; Gonçalves, Lídia M.; Bettencourt, Ana F.Purpose and Strategy: Development of a new local drug-delivery system aiming at bone infection and the modulation of the polymicrobial activity; simultaneous delivery of minocycline and voriconazole, antibacterial and antifungal agents, respectively; polylactide (PDLLA) scaffolds functionalized with collagen and bioglass, osteogenic enhancers.