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Evaluation of flocs resistance and reflocculation capacity using the LDS technique
Rasteiro, M. G.; Garcia, F. A. P.; Ferreira, P.; Blanco, A.; Negro, C.; Antunes, E.In a previous paper we have shown the added value of using LDS to monitor flocculation. It can supply, simultaneously, information on flocs size and structure and enlighten flocculation kinetics and mechanisms. In this paper, LDS is applied to study deflocculation and reflocculation processes of precipitated calcium carbonate (PCC) induced by cationic polyacrylamides, when different types of shear forces are ap...
Flocculation of PCC filler in papermaking: Influence of the particle characteri...
Antunes, E.; Garcia, F. A. P.; Ferreira, P.; Rasteiro, M. G.The influence of precipitated calcium carbonate (PCC) characteristics on the flocculation process and flocs structure was investigated in the presence of a linear, high molecular weight, cationic polyacrylamide of high charge density. For that, a commercial PCC sample was used, either as supplied (original PCC) or after a washing process (treated PCC). The PCC samples were characterised, and the flocculation pr...
Optimisation of the enzymatic synthesis of n-octyl oleate with immobilised lipa...
Rocha, J. M. S.; Gil, M. H.; Garcia, F. A. P.The enzymatic synthesis of n-octyl oleate by direct esterification of the oleic acid and the octanol in a solvent-free medium was previously shown to be efficiently catalysed by a lipase from Rhizomucor miehei covalently linked to a graft copolymer, the partially hydrolysed poly(ethylene)-g co-hydroxyethyl methacrylate (PE-g co-HEMA). In this work we went further towards an optimisation of the production of n-o...
Effects of additives on the activity of a covalently immobilised lipase in orga...
Rocha, J. M. S.; Gil, M. H.; Garcia, F. A. P.Lipase from Mucor miehei was covalently immobilised onto the graft copolymer poly(ethylene)-g.co-hydroxyethyl methacrylate (PE-g.co-HEMA), partially hydrolysed, via a spacer arm of 1,6-diaminohexane activated with glutaraldehyde. To improve the lipolytic activity of the immobilised lipase (for the synthesis of isoamyl-caprylate, as a model), the effect of several additives was investigated. Polyethylene glycol ...
Cellulose Derivatives Membranes as Supports for Immobilisation of Enzymes
Murtinho, D.; Lagoa, A. R.; Garcia, F. A. P.; Gil, M. H.Cellulosic derivatives (cellulose acetate, cellulose propionate and cellulose acetate-butyrate) as membranes, were prepared in different ways. These were then characterised by differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and contact angle evaluation. Subsequently, catalase (H2O2:H2O2 oxireductase; EC 1.11.1.6), alcohol oxidase (Alcohol:oxygen oxireductase; EC 1.1.3.13) and glucose...
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