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| Bettin,Fernanda; Cousseau,Francine; Martins,Kamila; Zaccaria,Simone; Girardi,Viviane; Silveira,Mauricio Moura da; Dillon,Aldo José Pinheiro. |
| (1) Background: In this study, the effects of different pH values (2.4, 3.2, 4.4 and 5.0), temperatures (30, 35, 40, 45 and 50°C) and agitation (100 rpm) on the enzymatic decolourisation of twenty-two dyes belonging to the chromophore groups anthraquinone, azo and triphenylmethane were assessed. (2) Methods: In all conditions, it was used a crude enzyme broth containing 30 U mL-1 laccases produced by Pleurotus sajor-caju PS-2001 in submerged process. (3) Results: Regarding the effects of pH values, the best results were obtained at pH 3.2 and 30°C, in which bleaching was observed for all dyes evaluated. In assays conducted at different temperatures, highest levels of decolourisation were observed at 35°C and pH 3.2 for nineteen of the dyes assessed.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pleurotus sajor-caju; Laccases; Dye decolourisation; Anthraquinone; Azo; Triphenylmethane. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100204 |
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| Erzinger,Gilmar Sidnei; Silveira,Mauricio Moura da; Costa,José Paulo Castilho Lopes da; Vitolo,Michele; Jonas,Rainer. |
| Previously grown cells of the ethanologenic bacterium Zymomonas mobilis produce sorbitol and gluconic acid, in reactions catalysed by the periplasmic enzymes glucose-fructose oxidoreductase (GFOR) and glucono-delta-lactonase (GL). The GFOR/GL system activity, in cells to be used in this bioconversion, depends on growth conditions. In batch runs, with initial glucose concentrations (S0) from 42 to 230 g/L, the highest specific and total GFOR/GL activities were obtained with S0 = 153 g/L (12.6 U/g cells and 62 U/L). Higher S0 led to decreasing activities in fresh cells. With S0 = 209 g/L, the final specific activity was only 7.0 U/g. After disruption of cells, however, an activity over 15 U/g was revealed. Since growth inhibition with S0 over 153 g/L was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zymomonas mobilis; Glucose-fructose oxidoreductase; Glucose. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822003000400008 |
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