8 documents found, page 1 of 1
Protective fibrous structures based on cellulose fibers functionalized with met...
Araújo, Joana Carolina Carvalho; Silva, Pedro M.; Cerqueira, Miguel A.; Teixeira, Maria Pilar Araújo; Tira-Picos, Vânia; Neto, PedroThis work aims to develop a bio-based fibrous material that is able to adsorb and degrade chemical and biological hazardous agents. Thus, cellulosic fabrics (flax) were functionalized with chitosan (CS) and poly(ethylene oxide) (PEO) electrospun nanofibers doped with titanium dioxide (TiO2) and cerium dioxide (CeO2) nanoparticles (NPs). The electrospray deposition of these NPs was also tested. The TiO2 NPs were...
Interlaboratory validation of a multiplex qPCR method for the detection of list...
Azinheiro, Sarah; Rodríguez-López, Pedro; Lozano-León, Antonio; Guedes, Hugo; Regal, Patricia; Franco, Carlos M.; Cepeda, AlbertoListeria monocytogenes is a major foodborne pathogen which mainly infects susceptible individuals through the consumption of contaminated foods. To this end, ready-to-eat (RTE) food products are of particular concern as this microorganism is widely distributed, can survive, and even grow, under adverse conditions, and thus must be carefully controlled. In the present study, an interlaboratory ring trial was org...
Chitosan nano/microformulations for antimicrobial protection of leather with a ...
Freitas, David Silva; Teixeira, Maria Pilar Araújo; Pinheiro, Inês Braga; Castanheira, Elisabete M. S.; Coutinho, Paulo J. G.; Alves, Maria J.Tanned leather can be attacked by microorganisms. To ensure resistance to bacteria on leather surfaces, protection solutions need to be developed, addressing both environmental issues and economic viability. In this work, chitosan nano/microparticles (CNP) and chitosan/silver nano/microstructures (CSNP), containing silver nanoparticles around 17 nm size, were incorporated into leather, obtained from the industr...
Bacteriophage treatment after chemical disinfection to tackle S. aureus VBNC ce...
Teixeira, Maria Pilar Araújo; Silva, Inês; Azeredo, Joana; Melo, Luís Daniel RodriguesFood is often contaminated during processing and packaging through contact with equipment surfaces. To avoid it, an efficient sanitation is necessary. However, several studies have demonstrated that although sanitizers reduced the levels of foodborne pathogens they might induce cells of foodborne bacteria into a viable but non-culturable (VBNC) state. We already confirmed that sodium hypochlorite and peracetic ...
Evaluation by flow cytometry of Escherichia coli viability in lettuce after dis...
Teixeira, Maria Pilar Araújo; Fernandes, Bruna; Silva, Ana Margarida; Dias, Nicolina Marques; Azeredo, JoanaFoodborne outbreaks due to the consumption of ready-to-eat vegetables have increased worldwide, with Escherichia coli (E. coli) being one of the main sources responsible. Viable but nonculturable bacteria (VBNC) retain virulence even after some disinfection procedures and constitute a huge problem to public health due to their non-detectability through conventional microbiological techniques. Flow cytometry (FC...
Comfort and infection control of chitosan-impregnated cotton gauze as wound dre...
Souza, Jefferson M.; Henriques, Mariana; Teixeira, Maria Pilar Araújo; Fernandes, Margarida Maria Macedo; Fangueiro, Raúl; Zille, AndreaThe aim of this study was to evaluate the thermo-physiological comfort properties of surgical cotton gauze coated with chitosan (CH) and its effectiveness for the prevention of bacterial colonization. Gauze was coated with CH at mass fractions of 0.50, 0.25, 0.125, 0.10, 0.063 wt% and the friction, flexibility, thermal, moisture management and mechanical properties were evaluated. The best performing gauze in t...
Electrospinning polypropylene with an amino acid as a strategy to bind the anti...
Nogueira, F.; Teixeira, Maria Pilar Araújo; Gouveia, Isabel C.Hospital isolation gowns are increasingly competitive, with brands and manufacturers contesting consumer preferences. The textile materials in contact with the skin can acquire secretions and multiresistant microorganisms, causing discomfort and health risks, respectively. A new nanofibrous substrate---polypropylene grafted with l-Cys---was developed with an increased crystallinity, providing its surface with -...
Characterization of biofilms of isolates from meat retail facilities
Rocha, Vanessa; Rodrigues, Diana Alexandra Ferreira; Teixeira, Maria Pilar AraújoAccording to EFSA cross contamination is implicated in about 40% of reported foodborne outbreaks, as pathogens can be transferred from several sources including raw foods during food processing to hands, cloths and food contact surfaces. Specifically, during slaughtering meat can be contaminated with bacteria directly by fecal contamination and indirectly by inadequately disinfected surfaces. This is aggravated...