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Kinetic analysis of batch ethanol acetylation in isothermal non-stationary multiphase systems by lyophilized mycelium of Aspergillus oryzae BJM
Palazzi,Emilio; Molinari,Francesco; Fabiano,Bruno; Pessoa Jr,Adalberto; Converti,Attilio.
A relatively complex network of reactions has been investigated, using as a network model the isothermal batch esterification of acetic acid with ethanol in n-heptane catalyzed by lyophilized mycelium of Aspergillus oryzae. The kinetic analysis was firstly carried out on the whole system, without any simplification, by means of the well-known integral method. Owing to the poor results obtained by this way, we developed an alternative approach, combining initial rates and integral analysis and reducing the number of empirical parameters to be determined by the use of equilibrium data. All the values of the parameters calculated according to this "composite" approach to kinetic analysis well correlate with experimental data.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aspergillus oryzae; Complex network; Enzyme reactions; Esterification; Organic solvent.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000100048
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Estimating the turnover number in enzyme kinetic reactions using transient and stationary state data BJPS
Uludag-Demirer,Sibel; Duran,Jorge; Tanner,Robert D..
Substrate and product concentration data obtained by simulating enzyme-substrate reaction rate equations were used to test two proposed kinetic rate constant estimation techniques in this study. In the first technique, the turnover number, k3, was calculated using early transient time domain data, which are difficult to obtain experimentally. The technique used an iterative approach to calculate k3 with a pair of data and the value of k3 could be retrieved with 35% error. The second technique calculated k3 using stationary domain data and the value of k3 could be retrieved with less than 5% error. This second technique also offered internal consistency in the calculation of k3 by calculating k3 both from the intercept and the slope of the linear plot...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Enzyme; Kinetics/rate constant; Enzyme reactions.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502009000400005
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