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Cyclodextrins as encapsulation agents for plant bioactive compounds
Pinho, Eva; Grootveld, Martin; Soares, Graça M. B.; Henriques, MarianaAbstract Plants possess a wide range of molecules capable of improve healing: fibre, vitamins, phytosterols, and further sulphur-containing compounds, carotenoids, organic acid anions and polyphenolics. However, they require an adequate level of protection from the environmental conditions to prevent losing their structural integrity and bioactivity. Cyclodextrins are cyclic oligosaccharides arising from the de...
Antibacterial potential of Northeastern Portugal wild plant extracts and respec...
Pinho, Eva; Ferreira, Isabel C.F.R.; Barros, Lillian; Carvalho, Ana Maria; Soares, Graça; Henriques, MarianaThe present work aims to assess the antibacterial potential of phenolic extracts, recovered from plants obtained on the North East of Portugal, and of their phenolic compounds (ellagic, caffeic, and gallic acids, quercetin, kaempferol, and rutin), against bacteria commonly found on skin infections. The disk diffusion and the susceptibility assays were used to identify the most active extracts and phenolic compo...
Gallic acid and cyclodextrins : inclusion complexes and antimicrobial activity
Pinho, Eva; Soares, Graça M. B.; Henriques, MarianaGallic acid (GA), or 3,4,5-trihydroxybenzoic acid, is the commonest and simplest phenolic acid, with just one aromatic ring. This phenolic molecule has been described as antioxidant, anti-inflammatory and anti-tumour, also, antimicrobial and anti-fungal activity has been attributed to it. Besides all the GA biological activities, this compound is cheap, due to the easy plant extraction, and non-toxic. Thus, thi...
Modification of polyamide 6.6 dyeing properties by grafting with poly(acrylic a...
Miranda, Teresa; Santos, Jorge Gomes; Soares, Graça M. B.978-972-8063-67-2 ; The wet chemical surface modification continues to be a growing area of research interest. This study describes preparation and characterization of poly (acrylic acid)-grafted polyamide 6.6 fabric. Poly(acrylic acid) has been grafted onto polyamide backbone using benzoyl peroxide (BPO) as catalyst in aqueous medium. The benzoyl peroxide initiator optimum concentration was 0.03 M. The best c...
Screening of the antibacterial activity of phenolic extracts from Portuguese no...
Pinho, Eva; Barros, Lillian; Soares, Graça M. B.; Ferreira, Isabel C. F. R.; Henriques, MarianaThermal injury, trauma, chronic ulcerations, pressure or venous stasis result in lost of skin integrity allowing the deposition and colonisation of the injury tissue by a wide range of bacteria. Skin and soft tissues infection are typically colonized by staphylococci or streptococci, but virtually any microorganism may induce tissue inflammation and immune response. The severity of the infection may range from ...
Preparation of silk fibroin–poly(ethylene glycol) conjugate films through click...
Sampaio, Sandra; Miranda, Teresa; Santos, Jorge Gomes; Soares, Graça M. B.Azide silk fibroin (azido SF) and alkyne terminal poly(ethylene glycol) (PEG) 2000 (acetylene-terminal PEG 2000) were synthesized. Azido SF was reacted with acetylene-terminal PEG 2000 to produce films via a copper-mediated 1,3-cycloaddition (‘click’ chemistry) generating a triazole linkage as the networking forming reaction. Through click chemistry, novel silk-based films with various weight ratios were prepar...
Assessment of antimicrobial activity of textiles for wound dressing: methodolog...
Pinho, Eva; Grootveld, Martin; Soares, Graça M. B.; Henriques, MarianaNormally, the skin is capable of restore the tissue integrity, after wound injury. However, the deposition of bacteria on the wound site results on infection causing pain and healing delay. To control bacteria proliferation, antimicrobial textiles have been developed, and the assessment of their activity is a required step. Although, several standard methods were published to assess textiles antimicrobial activ...
Development of biofunctional textiles by the application of resveratrol to cott...
Pinho, Eva; Henriques, Mariana; Oliveira, Rosário; Dias, Alberto Carlos Pires; Soares, Graça M. B.The goal of this work was to create a new generation of greener fabrics made of natural materials. For that, resveratrol (Res), obtained from Polygonum cuspidatum extract and known to have antibacterial, antifungal, and anti-inflammatory activity, was applied by an exhaustion method to cotton, bamboo, and silk knit fabrics. The fabrics adsorption behavior was tested and the amount of Res adsorbed was determined...
Studies on cotton modification with dodecenyl succinic anhydride (DDSA)
Miranda, Teresa; Le Goff, Amélie; Pereira, Anabela; Soares, Graça M. B.DDSA cotton materials were prepared by esterification reaction in aqueous suspension medium using an environmental friendly method. The main factors affecting the reaction, including temperature and pH of the system, were investigated and 40ºC and pH 8.5 were defined as the best reaction conditions to obtain DDSA cotton. The chemical structural characteristics of the samples were investigated by FTIR- ATR metho...
Naphthotriazole derivatives : synthesis and fluorescence properties
Campos, Ana M. F. Oliveira; Rodrigues, Lígia M.; Esteves, Ana Paula; Silva, Marília E.; Sivasubramanian, Aravind; Hrdina, Radim; Soares, Graça M. B.Eight fluorescent compounds containing a naphthotriazole moiety substituted at position 2 by a (vinylsulfonyl)aryl group or its precursors, containing hydroxyl or sulphonic groups or N-methylglycine, were prepared and characterized. The products were recovered in moderate yields after column chromatography or recrystallization and identified by proton and carbon nuclear magnetic resonance spectroscopy. Double r...
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