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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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Importance of the agar-media in the evaluation of bacteriocin activity against the same test-microorganisms BJPS
Azevedo,Pamela Oliveira de Souza de; Molinari,Francesco; Oliveira,Ricardo Pinheiro de Souza.
Abstract Bacteriocins are peptides produced by various species of bacteria, especially lactic acid bacteria, which exhibit a large spectrum of action against spoilage bacteria and foodborne pathogens. Successful application of techniques for quantitative or qualitative bacteriocin determination relies not only on the sensitivity of the test-microorganisms, but also on the agar-medium employed. Cell free supernatants are routinely used to preliminary screen for antimicrobial activity of bacteria by means of the agar well diffusion method, but the supernatant may also include other molecules (such as medium components and/or intracellular compounds) accidentally released during cell free supernatant preparation, which may interfere with the assay....
Tipo: Info:eu-repo/semantics/other Palavras-chave: Bacteriocin; Growth inhibition; Solid medium; Agar well diffusion assay.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502018000100301
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