Study of the effect of redox mediators on the decolorization of azo dyes by ascomycete yeasts

Bibliographic Details
Main Author: Ramalho, Patrícia Alexandra Costa Ferreira
Publication Date: 2003
Other Authors: Cardoso, M. Helena, Millward, Roy, Paulo, Artur Cavaco, Ramalho, Maria Teresa
Language: eng
Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
Download full: https://hdl.handle.net/1822/2160
Summary: Apresentação efectuada no "ECCOXXII – Braga 2003 : Biological Resources Centres and the Use of Microbes", em Braga, Portugal, em Setembro de 2003.
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spelling Study of the effect of redox mediators on the decolorization of azo dyes by ascomycete yeastsDecolorizationRedox mediatorsAzo dyesAscomycete yeastsApresentação efectuada no "ECCOXXII – Braga 2003 : Biological Resources Centres and the Use of Microbes", em Braga, Portugal, em Setembro de 2003.Many studies have appeared in recent years describing the positive effect of redox mediators on the biological decolourisation of azo dyes impermeant to the cell membranes. The need for mediators arises from the intracellular location of the reducing species which is postulated to be NAD(P)H, except in some cases where a purely chemical reduction of the dye is likely to occur, e.g. by sulphide ion formed in anoxic environments by sufate-reducing microorganisms [1]. The decolourisation of several azo dyes by ascomycete yeasts does occur efficiently without the addition of any mediator [2]. However, since an increase in decolourising efficiency would be useful for a possible application of these microorganisms to the treatment of dye-containing effluents of the textile industry, we tested whether commonly used mediators – AQS and FAD – either alone or in conjugation with menadione, had any positive effect on the process. Under the conditions normally used in our decolourisation assays the observed results were, apparently, inconsistent. The development of an easy method to detect the presence of oxygen in the incubation medium allowed us to establish that the positive effect of menadione on the decolourising activity of yeast cells occured only under anoxic conditions. A possible explanation of this fact will be presented. Furthermore, the effect of mediators on the process can easily be predicted through the determination of the peak potential of the reduction wave for the different dyes and mediators by cyclic voltammetry. [1] F. van der Zee “Anaerobic Azo Dye Reduction”. Full text dissertation from Wageningen University (2002). [2] Patrícia A.Ramalho, H.Scholze, M.Helena Cardoso, M.Teresa Ramalho e A.M.Oliveira-Campos “Improved Conditions for the Degradation of Azo Dyes by Candida zeylanoides”. Enzyme and Microbial Technology 31 (2002) 848-854.BIOEFTEX Project.Universidade do MinhoRamalho, Patrícia Alexandra Costa FerreiraCardoso, M. HelenaMillward, RoyPaulo, Artur CavacoRamalho, Maria Teresa2003-09-172003-09-17T00:00:00Zconference objectinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/1822/2160enginfo:eu-repo/semantics/openAccessreponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiainstacron:RCAAP2025-03-15T01:16:47Zoai:repositorium.sdum.uminho.pt:1822/2160Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireinfo@rcaap.ptopendoar:https://opendoar.ac.uk/repository/71602025-05-28T15:05:26.593110Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiafalse
dc.title.none.fl_str_mv Study of the effect of redox mediators on the decolorization of azo dyes by ascomycete yeasts
title Study of the effect of redox mediators on the decolorization of azo dyes by ascomycete yeasts
spellingShingle Study of the effect of redox mediators on the decolorization of azo dyes by ascomycete yeasts
Ramalho, Patrícia Alexandra Costa Ferreira
Decolorization
Redox mediators
Azo dyes
Ascomycete yeasts
title_short Study of the effect of redox mediators on the decolorization of azo dyes by ascomycete yeasts
title_full Study of the effect of redox mediators on the decolorization of azo dyes by ascomycete yeasts
title_fullStr Study of the effect of redox mediators on the decolorization of azo dyes by ascomycete yeasts
title_full_unstemmed Study of the effect of redox mediators on the decolorization of azo dyes by ascomycete yeasts
title_sort Study of the effect of redox mediators on the decolorization of azo dyes by ascomycete yeasts
author Ramalho, Patrícia Alexandra Costa Ferreira
author_facet Ramalho, Patrícia Alexandra Costa Ferreira
Cardoso, M. Helena
Millward, Roy
Paulo, Artur Cavaco
Ramalho, Maria Teresa
author_role author
author2 Cardoso, M. Helena
Millward, Roy
Paulo, Artur Cavaco
Ramalho, Maria Teresa
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Ramalho, Patrícia Alexandra Costa Ferreira
Cardoso, M. Helena
Millward, Roy
Paulo, Artur Cavaco
Ramalho, Maria Teresa
dc.subject.por.fl_str_mv Decolorization
Redox mediators
Azo dyes
Ascomycete yeasts
topic Decolorization
Redox mediators
Azo dyes
Ascomycete yeasts
description Apresentação efectuada no "ECCOXXII – Braga 2003 : Biological Resources Centres and the Use of Microbes", em Braga, Portugal, em Setembro de 2003.
publishDate 2003
dc.date.none.fl_str_mv 2003-09-17
2003-09-17T00:00:00Z
dc.type.driver.fl_str_mv conference object
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://hdl.handle.net/1822/2160
url https://hdl.handle.net/1822/2160
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron:RCAAP
instname_str FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron_str RCAAP
institution RCAAP
reponame_str Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
collection Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
repository.name.fl_str_mv Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
repository.mail.fl_str_mv info@rcaap.pt
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