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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 ...
Alternativas verdes para o preparo de amostra e determinação de poluentes fenól...
Rodrigues,Guilherme Dias; Silva,Luis Henrique Mendes da; Silva,Maria do Carmo Hespanhol daThe restricted availability of water sources suitable for consumption and high costs for obtaining potable water has caused an increase of the conscience concerning the use. Thus, there is a high demand for "environmentally safe methods" which are according to the principles of Green Chemistry. Moreover, these methods should be able to provide reliable results for the analysis of water quality for various pollu...
Aspectos coloidais da adesão de micro-organismos
Araújo,Emiliane Andrade; Andrade,Nélio José de; Carvalho,Antônio Fernandes de; Ramos,Afonso Mota; Silva,Cleuber Antônio de SáThe ability of bacteria to attach to surface and develop into a biofilm has been of considerable interest to food industry. Electrostatic, Lifhistz-van der Waals and Lewis acid-base forces are usually considered responsible for the interactions at the interface of the bacterial adhesion. The study of microbial adhesion thermodynamic is important because it represents the reflection of microbial surface and food...
Thermodynamic studies of partitioning behavior of lysozyme and conalbumin in aq...
Sousa, Rita de Cássia Superbi de; Coimbra, Jane Sélia dos Reis; Silva, Luis Henrique Mendes da; Silva, Maria do Carmo Hespanhol daThe objective of this study was to determine the thermodynamic parameters (ΔtrG, ΔtrH and ΔtrS) associated with lysozyme and conalbumin partitioning in aqueous two-phases systems (ATPS). Influence of salt type and polyethylene glycol (PEG) concentrations on the partition coefficient of lysozyme and conalbumin from egg white was studied. The evaluated ATPS were composed of PEG 1500 and inorganic salts (sodium ci...
Sistemas aquosos bifásicos: fundamentos e aplicações para partição/purificação ...
Silva,Luis Henrique Mendes da; Loh,WatsonBy the year 2005 the world biochemical market will reach an estimated $ 100 billion and separation processes are a vital link between lab discoveries and the fulfillment of this commercialization potential. The practical application of aqueous two-phase systems (ATPS) to extraction processes has been exploited for several years for the recovery of biological products. Unfortunately, this has not resulted in an ...
Sistema aquoso bifásico: uma alternativa eficiente para extração de íons
Silva,Maria do Carmo Hespanhol da; Silva,Luis Henrique Mendes da; Paggioli,Fernanda Jürgensen; Coimbra,Jane Sélia Reis; Minim,Luis AntonioSolvent extraction has been successfully applied to metal ion preconcentration and often meant the use of toxic organic diluents. However, regulatory pressure is increasingly focusing on the use and disposal of organic solvents, and thus the development of nonhazardous alternatives is important. In this review, we examine the application of aqueous biphasic systems (ABS) to extraction of ions, analyzing their p...
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