Ionic Gelation
Mostrando 13-21 de 21 artigos, teses e dissertações.
-
13. Efeito crioprotetor de lactose e glicose em cÃlulas fÃngicas imobilizadas em alginato de sÃdio como mÃtodo de preservaÃÃo de culturas. / Cryoprotectant effect of lactose and glucose yeast cells immobilized in calcium alginate as a method for preservation of cultures
Cryopreservation is the method of choice in many banks of microorganisms because it leads to a situation of metabolic dormancy and consequently cultures are stable for long periods. By reducing the temperature may however be formed of ice crystals which tend to cause cell damage to cell damage in turn can be avoided by vitrification process which takes place
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/08/2011
-
14. Caracterização, purificação e encapsulamento de lipase de Burkholderia cepacia / Characterization, purification and encapsulation of lipase from Burkholderia cepacia
: O presente trabalho foi dividido em três etapas e teve como objetivo a caracterização, purificação e encapsulamento da lípase a partir da cepa de Burkholderia cepacia. Para produção da enzima, o microorganismo foi cultivado em meio contendo sais, extrato de levedura, peptona bacteriológica e 6% de óleo de soja, por fermentação líquida em biorr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/05/2010
-
15. Pure solvents and their mixtures solvation: relevance to chemistry and creen chemistry / Solvatação por solventes puros e suas misturas: relevância para química e química verde
In the present work, solvatochromic probes were employed in the study of pure solvents, binary mixtures of water with protic and aprotic solvents, ionic liquids and their aqueous binary mixtures The probes studied are classified in two series: (i) RPMBr2; where R = methyl to 1-octyl allowed increasing the hydrophobicity while maintaining the pKa constant. (i
Publicado em: 2008
-
16. Produção de microparticulas por gelificação ionica para alimentação de larvas de peixe : estudos em sistema-modelo com incluão de microparticulas lipidicas ou emulsão lipidica e testes in vivo. / Production of microparticles by ionic gelation for fish larvae feeding : studies in model-system with inclusion of lipids microparticles or emulsion and assays in vivo.
Este estudo teve como objetivo produzir micropartículas por gelificação iônica contendo, como recheios, constituintes nutricionalmente importantes para a alimentação de larvas de peixes. Na primeira parte deste estudo, foram desenvolvidos sistemas modelos compostos por micropartículas obtidas por gelificação iônica utilizando os polissacarídeos pe
Publicado em: 2008
-
17. DifusÃo e transporte na presenÃa de macromolÃculas. Imagens e espectroscopia por RMN
The electronic Overhauser effect was employed to enhance nuclear magnetic resonance images obtained in a magnetic eld of only 16 mT. Despite the weak magnetic eld, the technique can reveal, in some systems, various aspects of ionic transport and kinetics apparently not observed in conventional high-eld magnetic resonance imaging. We employed Overhauser imagi
Publicado em: 2004
-
18. Gelificação termorreversivel em soluções aquosas de polifosfato de aluminio
Admixture of aqueous sodium polyphosphate solutions and aluminum salts (nitrate, sulfate and chloride) lead to the formation of thermoreversible gels. Gels formed above roam temperature change back to clear solutions, upon cooling. For some compositions, gel formation happens at roam temperature. This behavior was observed in polymeric systems, but it has no
Publicado em: 1995
-
19. Studies on effect of pH on cross-linking of chitosan with sodium tripolyphosphate: A technical note
The ionotropic gelation method for formation of crosslinked chitosan particles can be easily modified from ionic cross-linking to deprotonation by adjusting the pH of TPP. Chitosan was cross-linked ionically with TPP at lower pH and by deprotonation mechanism at higher pH. The swelling behavior of cross-linked chitosan appeared to depend on the pH of TPP. Th
Springer-Verlag.
-
20. Design and in vitro and in vivo evaluation of mucoadhesive microcapsules of glipizide for oral controlled release: A technical note
Thus, large spherical microcapsules with a coat consisting of alginate and a mucoadhesive polymer (sodium CMC, methylcellulose, Carbopol, or HPMC) could be prepared by an orifice-ionic gelation process. The microcapsules exhibited good mucoadhesive properties in an in vitro test. Glipizide release from these mucoadhesive microcapsules was slow and extended o
Springer-Verlag.
-
21. Precipitation of Metallic Cations by the Acidic Exopolysaccharides from Bradyrhizobium japonicum and Bradyrhizobium (Chamaecytisus) Strain BGA-1
The interaction between the acidic exopolysaccharides produced by two Bradyrhizobium strains and several metal cations has been studied. Aqueous solutions in the millimolar range of Fe3+ but not of Fe2+ precipitated the exopolysaccharides from Bradyrhizobium (Chamaecytisus) strain BGA-1 and, to a lesser extent, Bradyrhizobium japonicum USDA 110. The precipit