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	Provedor de dados Anais da ABC (AABC) (1) BABT (1) Autor CAMPOS,RAQUEL A. (1) Campos-Takaki,Galba Maria (1) HESPANHOL,MARIA C. (1) Lima-Filho,José Luís (1) Melo,Homero José Farias de (1) Moreira,Keila Aparecida (1) PATRÍCIO,PAMELA R. (1) Porto,Ana Lúcia Figueiredo (1) SILVA,LUIS HENRIQUE M. DA (1) Sarubbo,Leonie Asfora (1) Tambourgi,Elias Basile (1) VARGAS,SILVIA JULIANA R. (1) Mais... Palavra-chave Aqueous two-phase system (2) Ascorbic oxidoreductase (1) Efficiency (1) Flame atomic absorption spectrometry (1) Green chemistry (1) Iron (1) Mass transfer coefficient (1) Perforated Rotating Disc contactor (1) Speciation (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2018 (1) 2004 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Green speciation of iron using aqueous two-phase system Anais da ABC (AABC) CAMPOS,RAQUEL A.; PATRÍCIO,PAMELA R.; VARGAS,SILVIA JULIANA R.; SILVA,LUIS HENRIQUE M. DA; HESPANHOL,MARIA C.. Abstract Fe(II) and Fe(III) have distinct chemical and biological functions. Consequently, it is more important to determine the fraction of both oxidation state that knowing the total iron concentration in a sample. However, green methods for iron speciation are still limited. This work uses aqueous two-phase system, a safe alternative to liquid–liquid extraction, to perform the chemical speciation of iron. This method is based on the reaction of Fe(II) with 1,10-phenanthroline extractant, forming a complex of Fe(II)-phenanthroline that concentrates in the top phase of the system. The Fe(III) specie concentrated in the bottom phase of the system. Iron speciation was affected by the electrolyte nature, macromolecule type, quantity of phenanthroline added,... Tipo: Info:eu-repo/semantics/article Palavras-chave: Aqueous two-phase system; Flame atomic absorption spectrometry; Iron; Speciation; Green chemistry. Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000501929 Recovery of ascorbic oxidoreductase from crude extract with an aqueous two-phase system in a perforated rotating disc contactor BABT Porto,Ana Lúcia Figueiredo; Sarubbo,Leonie Asfora; Moreira,Keila Aparecida; Melo,Homero José Farias de; Lima-Filho,José Luís; Campos-Takaki,Galba Maria; Tambourgi,Elias Basile. A continuous perforated rotating disc contactor was used to extract the enzyme ascorbic oxidoreductase (E.C.1.10.3.3) from crude extract of Curcubita maxima with an aqueous two-phase system of poly (ethylene glycol) and phosphate salts. The effect of dispersed phase velocity on either protein mass transfer coefficients or separation efficiency at 1, 2 and 3 mL/min was studied. An increase of the mass transfer coefficients was observed with the dispersed phase velocity, while the separation efficiency showed a small decrease with the increase of this parameter. The experimental results obtained during continuous extraction showed that the ascorbic oxidoreductase activity was partitioned preferentially into the salt-rich phase in all conditions studied. The... Tipo: Info:eu-repo/semantics/article Palavras-chave: Efficiency; Mass transfer coefficient; Perforated Rotating Disc contactor; Aqueous two-phase system; Ascorbic oxidoreductase. Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000500019 Registros recuperados: 2 Primeira ... 1 ... Última

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