Browsing by Author "Costa, Eduardo Manuel"
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- Phenolic compounds from by-products for functional textilesPublication . Afonso, Tiago Barros; Bonifácio-Lopes, Teresa; Costa, Eduardo Manuel; Pintado, Manuela EstevezTextile dyeing is known to have major environmental concerns, especially with the high use of toxic chemicals. The use of alternatives such as natural dyes rich in phenolic compounds has become extremely appealing in order to move towards a more sustainable circular economy. Phenolic dyes have the potential to functionalize textile fabrics with properties such as antimicrobial, antioxidant, and UV protection. Wastes/residues from the agri-food industries stand out as highly attractive sources of these compounds, with several by-products showing promising results in textile dyeing through the implementation of more sustainable and eco-friendly processes. This review presents an up-to-date exploration of the sources of phenolic compounds used in the textile industry over the past two decades, with a primary focus on the functional properties they provide to different fabrics. The research highlights a surge in interest in this theme since 2017, accentuating a noticeable upward trend. Throughout this review, emphasis is given to by-products from the agri-food industry as the sources of these compounds. The reviewed papers lay the foundation for future research, paving the way for exploring the potential of raw materials and by-products in the creation of functional and smart textiles.
- A quitosana como biomaterial odontológico: estado da artePublication . Tavaria, Freni Kekhasharú; Costa, Eduardo Manuel; Pina-Vaz, Irene; Carvalho, Manuel Fontes; Pintado, Maria ManuelaA impossibilidade de erradicar completamente os microrganismos da cavidade oral ou dos canais radiculares estimula a procura de novos materiais que permitam cada vez mais eficazmente, controlar ou prevenir o aparecimento de infeções. A quitosana é um biopolímero com uma estrutura química e características únicas que permitem que apresente excelente biocompatibilidade e que seja facilmente processado. A panóplia de aplicações é tão fascinante como ainda mal conhecida. A constatação do potencial e do valor industrial deste biopolímero conduziu à sua utilização em muitas aplicações de interesse tecnológico e, de uma forma acentuada, na área biomédica. As suas propriedades anti-oxidantes, anti-microbianas, anti-inflamatórias, cicatrizante e de inibição da formação de biofilmes tornam a sua aplicação na odontologia particularmente interessante. Com este trabalho pretendeu-se rever a literatura existente sobre aplicações da quitosana na área odontológica.
- A review of chitosan's effect on oral biofilms: perspectives from the tube to the mouthPublication . Costa, Eduardo Manuel; Silva, Sara; Veiga, Mariana; Tavaria, Freni Kekhasharú; Pintado, Maria ManuelaBackground: The oral cavity is a propitious environment for bacteria with different tissue tropisms to colonize and grow due to its diverse surfaces. For bacterial survival in the oral cavity, where tissues are continuously bathed in fluids, biofilm formation is necessary. Dental biofilm, i.e. dental plaque, is notoriously hard to inhibit and traditional oral care solutions are either ineffective at managing oral bio-films or cause secondary effects, such as teeth staining, that make them unattractive. Highlight: Chitosan has high biocompatibility and antimicrobial activity that is heralded by the pharmaceutical industry for its applicability in biofabrication. Therefore, this material is a potential substitute for the antimicrobials traditionally used in oral care. Conclusion: Currently, the body of work on chitosan and the oral cavity ranges from planktonic studies in vitro to biofilm control/removal studies in vivo. With a wide range of topics available for analysis, this review provides a working understanding of chitosan's role in the control and management of oral biofilms.