Encontrados 8 documentos, a visualizar página 1 de 1
Interactions between K-carrageenan and chitosan in nanolayered coatings - Struc...
Pinheiro, A. C.; Bourbon, A. I.; Medeiros, Bartolomeu G. de S.; Silva, Luis Henrique Mendes da; Silva, Maria do Carmo Hespanhol daThe interactions between -carrageenan and chitosan, two oppositely charged polysaccharides, have been investigated through microcalorimetric and quartz crystal microbalance measurements. Microcalorimetric measurements show that -carrageenan/chitosan interaction is an exothermic process and that the alternate deposition of -carrageenan and chitosan results in the formation of a nanolayered coating mainly due ...
Polysaccharide/protein nanomultilayer coatings : construction, characterization...
Medeiros, Bartolomeu G. de S.; Teixeira, J. A.; Vicente, A. A.; Carneiro-da-Cunha, Maria G.Nanolayered coatings of κ-carrageenan, a polysaccharide with good gas barrier properties, and lysozyme, a protein with antimicrobial action, were in a first stage assembled on aminolysed/charged polyethylene terephthalate (PET) pieces, which acted as a support, by alternate five-layer deposition. This was performed to allow the characterization of the nanomultilayer system. PET aminolysis was confirmed by Fouri...
Influence of concentration, ionic strength and pH on zeta potential and mean hy...
Carneiro-da-Cunha, Maria G.; Cerqueira, M. A.; Souza, B. W. S.; Teixeira, J. A.; Vicente, A. A.Polysaccharide multinanolayers are becoming a new and general means of modifying and functionalizing surfaces of several materials. This is achieved through changing the interfacial properties of those surfaces followed by sequential adsorption of e.g., polysaccharides. Knowledge of properties of polysaccharide solutions such as zeta potential (Zp) and mean hydrodynamic diameter (Z-average) is crucial to obtain...
Interaction of Moringa oleifera seed lectin with humic acid
Santos, Andréa F. S.; Carneiro-da-Cunha, Maria G.; Teixeira, J. A.; Paiva, Patrícia M. G.; Coelho, L. C. B. B.; Nogueira, R.The aim of this work was to characterise the affinity of protein preparations from Moringa oleifera seeds, specifically extract (seeds homogenised with 0.15 M NaCl), fraction (extract precipitated with 390 mg mL−1 of ammonium sulphate) and cMoL (coagulant M. oleifera lectin) to bind humic acids using a haemagglutinating activity assay with rabbit erythrocytes and a radial diffusion assay in agarose gel. Specifi...
Polysaccharide from Anacardium occidentale L. tree gum (Policaju) as a coating ...
Souza, Marthyna P.; Cerqueira, M. A.; Souza, B. W. S.; Teixeira, J. A.; Porto, Ana L. F.; Vicente, A. A.; Carneiro-da-Cunha, Maria G.Policaju-based coatings were applied on “Tommy Atkins” mangoes and the effects of four different treatments on mango shelf-life were evaluated under storage condition at 4◦C and 82 % of relative humidity over 28 days. The surface tension of mangoes was found to be 29.04 mN m−1; the dispersive and polar components were 27.57 mN m−1 and 1.47 mN m−1, respectively, and the critical surface tension was 22.7 mN m−1. ...
Physical properties of edible coatings and films made with a polysaccharide fro...
Carneiro-da-Cunha, Maria G.; Cerqueira, M. A.; Souza, B. W. S.; Souza, Marthyna P.; Teixeira, J. A.; Vicente, A. A.The effect of the concentrations of the polysaccharide from Anacardium occidentale L. (Policaju) and a surfactant (Tween 80) on relevant properties of edible coatings/films, in view of their application on apples (cv. Golden) was evaluated. The influence of the interactions between those two constituents on apples’ surface properties and on the coating/film’s wettability, water vapor permeability, opacity and m...
Optimized extraction of a lectin from Crataeva tapia bark using AOT in isooctan...
Nascimento, Cynthia O.; Costa, Romero M. P. B.; Araújo, Regina M. S.; Chaves, Maria E. C.; Coelho, L. C. B. B.; Paiva, Patrícia M. G.; Teixeira, J. A.Crataeva tapia bark lectin was extracted from a crude extract into a reversed micelle phase of the anionic surfactant AOT in isooctane and back-extracted, to a final aqueous phase by addition of butanol. The effects of pH, ionic strength and surfactant concentration on the protein transfer process from the aqueous to the organic phase were characterized, being the best results obtained after 5 min of contact, u...
Immobilization of b-galactosidase from kluyveromyces lactis onto a polysiloxane...
Neri, D. F. M.; Balcão, V. M.; Carneiro-da-Cunha, Maria G.; Carvalho Junior, L. B.; Teixeira, J. A.β-Galactosidase from Kluyveromyces lactis was covalently immobilized onto a mPOS–PVA, using glutaraldehyde as activating agent and its properties were evaluated. The enzymatic water insoluble derivative displayed the same optimum pH (6.5) and optimum temperature (50 °C) of the soluble enzyme. The apparent Km app and activation energy for both soluble and immobilized enzyme derivative were found to be not signif...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||