Dyeing of cotton with madder using (bio)mordants: effects on fastness and UV protection properties

This work aimed at studying the dyeing of cotton fabrics with madder extract using two biomordants, quebracho tree extract (Schinopsis spp.) and laccase. Pre-treatment with quebracho increased the colour strength, washing and UV light fastness, and UV protection, while laccase only shows an increase in the UV light fastness. The application of biomordants together with the metal ones (aluminium or iron salts) led to an improved UV light fastness compared to the samples mordanted only with metal salts. Meanwhile, although the colour strength was lower than in the metal-mordanted samples, greater UV protection factors were obtained in the samples pre-treated with quebracho or laccase and iron salt.Authors acknowledge the Portuguese Foundation for Science and Technology (FCT), FEDER funds by means of Portugal 2020 Competitive Factors Operational Program (POCI) and the Portuguese Government (OE), project Factor ST+ – grant number POCI-01-0247-ERDF-047124, for the research grants of C.A., M.F., and R.R. Authors also acknowledge projects: UID/CTM/00264/2019 and UID/CTM/00264/2021 of Centre for Textile Science and Technology (2C2T)

Effect of plasma and cationization pre-treatiments on fastiness and UV protection of cotton dyed with madder

To achieve good colour depth and fastness of naturally dyed fabrics is necessary to use mordants, usually metallic salts, which are potentially harmful to the environment and human health. In this work, the effect of plasma and cationization pre-treatments on cotton fabrics dyed with natural dye madder extract was investigated as environmentally sustainable alternative processes. Air atmospheric dielectric barrier discharge (DBD) plasma treatment showed a slight improvement in fastness to washing and UV light when samples were dyed at pH 11. On the other side, cationization with poly(diallyldimethylammonium chloride) (PDDA) greatly improved the dye uptake onto cotton, but with poor fastness. Meanwhile, the simultaneous pre-treatment with metallic mordants improved significantly the fastness properties, being the PDDA/Fe pre-treatment, followed by dyeing at pH 5, the process which showed the best results regarding colour strength, fastness to UV light, and UV protection

Dyeing of cotton with madder using (bio)mordants: effects on fastness and UV protection properties

Apresentação efetuada na 21th World Textile Conference - AUTEX 2022, em Lodz, Poland, 2022Portuguese Foundation for Science and Technology (FCT), FEDER funds by means of Portugal 2020 Competitive Factors Operational Program (POCI) and the Portuguese Government (OE), project Factor ST+ – grant number POCI-01-0247-ERDF-047124, for the research grants of C.A., M.F., and R.R.Authors also acknowledge projects: UID/CTM/00264/2019 and UID/CTM/00264/2021 of Centre for Textile Science and Technology (2C2T

Modification of nanocellulose

Nanocellulose (NC) represents a pivotal material for the sustainable strategies of the future. NC comprises cellulose nanofibrils (CNFs), cellulose nanocrystals (CNCs), and bacterial nanocellulose (BNC), each exhibiting unique and exceptional physicochemical properties. These properties encompass high specific surface area, high tensile strength, lightweight, biodegradability, good barrier properties, and high processing versatility. However, the range of properties and applications can be significantly expanded through the modification of NC, involving both chemical and physical methodologies, which introduce a plethora of functional groups to the densely populated hydroxyl groups present in pristine NC. The modification processes discussed in this chapter encompass chemical and physical modifications that were reported mostly within the last 5 years. The described methodologies emphasize the potential of NC as a substrate for advanced functional and sustainable material

Chapter 34 - Biocompatibility of nanocellulose: Emerging biomedical applications

Nanocellulose already proved to be a highly relevant material for biomedical applications, ensued by its outstanding mechanical properties and, more importantly, its biocompatibility. Nevertheless, despite their previous intensive research, a notable number of emerging applications are still being developed. Interestingly, this drive is not solely based on the nanocellulose features, but also heavily dependent on sustainability. The three core nanocelluloses encompass cellulose nanocrystals (CNCs), cellulose nanofibrils (CNFs), and bacterial nanocellulose (BNC). All these different types of nanocellulose display highly interesting biomedical properties per se, after modification and when used in composite formulations. Novel applications that use nanocellulose includewell-known areas, namely, wound dressings, implants, indwelling medical devices, scaffolds, and novel printed scaffolds. Their cytotoxicity and biocompatibility using recent methodologies are thoroughly analyzed to reinforce their near future applicability. By analyzing the pristine core nanocellulose, none display cytotoxicity. However, CNF has the highest potential to fail long-term biocompatibility since it tends to trigger inflammation. On the other hand, neverdried BNC displays a remarkable biocompatibility. Despite this, all nanocelluloses clearly represent a flag bearer of future superior biomaterials, being elite materials in the urgent replacement of our petrochemical dependence

Antimicrobial activity of bacterial nanocellulose modified with chestnut extract

Chestnut wood extracts are rich in tannins that exhibit numerous health-promoting properties. The incorporation of 5% (w/v) chestnut extract within the nanofibrous structure of bacterial nanocellulose (BNC) produced by Gluconacetobacter hansenii ATCC 53582 was obtained through exhaustion. This simple processing methodology resulted in a flexible (upon addition of 2% (w/v) glycerol), biodegradable, biocompatible nanocomposite for potential application in medical appliances.Portuguese Foundation for Science and Technology (FCT), FEDER funds through Portugal 2020 Competitive Factors Operational Program (POCI), and thePortuguese Government (PG) for the projects: UID/CTM/00264/2021 of Centre for Textil e Science and Technology (2C2T) and PTDC/CTM-TEX/1213/2020;FCT, the Ministry of Science, Technology and Higher Education (MCTES), the European Social Fund (FSE) and the European Union (UE)for her Ph.D. funding via scholarship 2020.04919.BD;FCT, FEDER, POCI, and PG for her research grant POCI-01-0247-ERDF-047124

Antibacterial hydrogel dressings and their applications in wound treatment

Antimicrobial hydrogels, both in semi-stiff sheets and amorphous form, have been extensively studied for wound management mainly owing to their high-water content, lower wound adherence, promoted autolysis debridement, epithelial migration, and granulation growth. Benefiting from the recent advances in materials science, biotechnology, and a growing understanding of wound microbiology, an extensive variety of antimicrobial hydrogels have been developed. These novel antimicrobial hydrogels can prevent and control microbial infection. In addition, they possess wound healing functions for improved wound management. This chapter will provide a comprehensive summary of the current studied antimicrobial hydrogels in literature and available hydrogel dressings in the market, including their design, fabrication method, and wound management efficacy in vitro or in vivo. The detailed and critical discussion of the advantages and disadvantages of each type of hydrogel dressing will provide insights into the future design of antimicrobial hydrogels for better management of wounds in clinical application

Physical properties of an antibacterial and antiviral woven cotton functionalized with a multi-nanocomposite

[Excerpt] Introduction Wound infection is a critical factor that seriously hinders adequate healing preventing epithelialization and angiogenesis. This is particularly grievous and prevalent in burn and chronic wounds.This research was funded by FEDER funds through the Operational Competitiveness Program–COMPETE under the Project POCI-01-0247-FEDER-039733, and by National Funds through Fundação para a Ciência e Tecnologia (FCT), under the project UID/CTM/00264/2020. Liliana Melro, Rui D. V. Fernandes, and Ana Isabel Ribeiro acknowledge FCT, MCTES, FSE, and UE PhD grants 2020.04919.BD, SFRH/BD/145269/2019, SFRH/BD/137668/2018

Soluble human Suppression of Tumorigenicity 2 is associated with endoscopic activity in patients with moderate-to-severe ulcerative colitis treated with golimumab

Suppressor of Tumorigenicity 2 (ST2) is an IL33 receptor detected in the mucosa and serum of ulcerative colitis (UC) patients. We evaluated soluble ST2 (sST2) as a surrogate biomarker of disease outcome and therapeutic response, in moderate-to-severe UC patients treated with golimumab.Agência financiadora Merck Sharp and Dohme, Lda, Portugal MK8259-22info:eu-repo/semantics/publishedVersio

Effect of PEDOT:PSS with secondary dopants and DBD plasma treatment on the conductive properties of polyester fabrics

[Excerpt] Introduction Smart textiles have the capability to interact with the surrounding environment and react in different ways, namely in electrical conduction. The conductive properties of these materials are useful in medical, healthcare, and protective clothing.This research was funded by FEDER funds through the Operational Competitiveness Program– COMPETE, under the projects POCI-01-0247-FEDER-068924, and by National Funds through Fundação para a Ciência e Tecnologia (FCT), under the project UID/CTM/00264/2020. Ana Isabel Ribeiro and Cátia Alves acknowledge FCT, MCTES, FSE, and UE PhD grant SFRH/BD/145269/2019 and 2022.10454.BD