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Effect of neutralization and cross-linking on the thermal degradation of chitos...
Correia, D. M.; Gámiz- González, M. A.; Botelho, G.; Vidaurre, A.; Gomez Ribelles, J. L.; Lanceros-Mendez, S.; Sencadas, V.Thermal degradation of as electrospun chitosan membranes and samples subsequently treated with ethanol and cross-linked with glutaraldehyde (GA) have been studied by thermogravimetry (TG) coupled with an infrared spectrometer (FTIR). The influence of the electrospinning process and cross-linking in the electrospun chitosan thermal stability was evaluated. Up to three degradation steps were observed in the TG da...
Thermal and hydrolytic degradation of electrospun fish gelatin membranes
Correia, D.M.; Padrão, J; Rodrigues, L. R.; Dourado, F.; Lanceros-Mendez, S.; Sencadas, V.The thermal and hydrolytic degradation of electrospun gelatin membranes cross-linked with glutaraldehyde in vapor phase has been studied. In vitro degradation of gelatin membranes was evaluated in phosphate buffer saline solution at 37 ºC. After 15 days under these conditions, a weight loss of 68 % was observed, attributed to solvation and depolymerization of the main polymeric chains. Thermal degradation kinet...
PHB-PEO electrospun fiber membranes containing chlorhexidine for drug delivery ...
Fernandes, J. G.; Correia, D. M.; Botelho, G.; Padrão, J.; Ribeiro, C.; Lanceros-Mendez, S.; Sencadas, V.Fiber meshes of poly(hydroxybutyrate) (PHB) and poly(hydroxybutyrate)/ poly(ethylene oxide) (PHB/PEO) with different concentrations of chlorhexidine (CHX) were prepared by electrospinning, for assessment as a polymer based drug delivery system. The electrospun fibers were characterized at morphological, molecular and mechanical levels. The bactericidal potential of PHB and PHB/PEO electrospun fibers with and wi...
Thermal and hydrolytic degradation of electrospun fish gelatin membranes
Correia, D. M.; Padrão, Jorge; Rodrigues, L. R.; Dourado, Fernando; Lanceros-Méndez, S.; Sencadas, V.The thermal and hydrolytic degradation of electrospun gelatin membranes cross-linked with glutaraldehyde in vapor phase has been studied. In vitro degradation of gelatin membranes was evaluated in phosphate buffer saline solution at 37 °C. After 15 days under these conditions, a weight loss of 68% was observed, attributed to solvation and depolymerization of the main polymeric chains. Thermal degradation kineti...
Physical-chemical properties of cross-linked chitosan electrospun fiber mats
Sencadas, V.; Correia, D. M.; Ribeiro, C.; Moreira, Susana; Botelho, Gabriela; Gómez Ribelles, J. L.; Lanceros-Méndez, S.Chitosan fiber mats were successfully processed by electrospinning. The as-spun fiber mats were neutralized with ethanol and cross-linked with glutaraldehyde. A decrease of the fiber average diameter from 243 ± 43 nm down to 215.53 nm was observed for the neutralized and cross-linking chitosan membrane. It was found that the processing conditions do not alter the initial deacetylation degree of the polymer. Pol...
Determination of the parameters affecting electrospun chitosan fiber size distr...
Lanceros-Méndez, S.; Sencadas, V.; Correia, D. M.; Gómez Ribelles, J. L.; Botelho, Gabriela; Areias, A. C.; Fonseca, A. Maurício C.; Neves, I. C.The production of chitosan nanofiber mats by electrospinning presents serious difficulties due to the lack of suitable solvents and the strong influence of processing parameters on the fiber properties. Two are the main problems to be solved: to control the properties of the solution in order to obtain large area uniform fiber mats by having a stable flow rate and to avoid sparks during the process, dam...
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