2.50
Hdl Handle:
http://hdl.handle.net/10033/295484
Title:
Direct electrochemical determination of Candida albicans activity.
Authors:
Hassan, Rabeay Y A; Bilitewski, Ursula
Abstract:
Despite advances made in the field, rapid detection methods for the human pathogen Candida albicans are still missing. In this regard, bio-electrochemical systems including electrochemical sensors and biosensors satisfy the increasing demand for rapid, reliable, and direct microbial analyses. In this study, the bioelectrochemical characteristics of C. albicans were investigated for use in an analytical system that determines the viability of the organisms. The electrochemical responses of viable and non-viable cells of C. albicans and Saccharomyces cerevisiae were monitored. Cyclic voltammograms (CV) showed an irreversible oxidation peak at about 750mV that accounts for viable cells. The peak current increased at viable cell numbers ranging from 3×10(5) to 1.6×10(7)cells/ml, indicating that the amount of viable cells can be accurately quantified. To elucidate the underlying electron transfer processes, the influence of electron transfer chain (ETC) - inhibitors on the electrochemical behavior of the two organisms were investigated. Inhibition of the function of classical respiratory chain (CRC) led to a decrease in the electrochemical response, whereas the oxidation current increased when the alternative oxidase (AOX) pathway was blocked by salicylhydroxamic acid (SHA). Blocking the AOX pathway improved the electrochemical performance, suggesting an involvement in the CRC, with cytochrome c oxidase (COX) as a relevant protein complex. Mutants, in which components of COX were deleted, showed a lower electro-activity than the wild-type strain. Particularly, deletion of subunit COX5a almost completely abolished the electrochemical signal. We believe that this work can be utilized for the development of early detection assays and opens the door for new technological developments in the field of C. albicans.
Affiliation:
Helmholtz Centre for Infection Research, Working Group BiSA, Inhoffenstr. 7, 38124 Braunschweig, Germany; Microanalysis Lab, Applied Organic Chemistry Department, National Research Centre (NRC), Eltahrir Street, 12311-Dokki, Cairo, Egypt. Electronic address: rabeayy@yhaoo.com.
Citation:
Direct electrochemical determination of Candida albicans activity. 2013, 49C:192-198 Biosens Bioelectron
Journal:
Biosensors & bioelectronics
Issue Date:
15-May-2013
URI:
http://hdl.handle.net/10033/295484
DOI:
10.1016/j.bios.2013.05.015
PubMed ID:
23747360
Type:
Article
ISSN:
1873-4235
Appears in Collections:
publications of the research group compound profiling and screening (COPS)

Full metadata record

DC FieldValue Language
dc.contributor.authorHassan, Rabeay Y Aen_GB
dc.contributor.authorBilitewski, Ursulaen_GB
dc.date.accessioned2013-07-08T13:36:57Z-
dc.date.available2013-07-08T13:36:57Z-
dc.date.issued2013-05-15-
dc.identifier.citationDirect electrochemical determination of Candida albicans activity. 2013, 49C:192-198 Biosens Bioelectronen_GB
dc.identifier.issn1873-4235-
dc.identifier.pmid23747360-
dc.identifier.doi10.1016/j.bios.2013.05.015-
dc.identifier.urihttp://hdl.handle.net/10033/295484-
dc.description.abstractDespite advances made in the field, rapid detection methods for the human pathogen Candida albicans are still missing. In this regard, bio-electrochemical systems including electrochemical sensors and biosensors satisfy the increasing demand for rapid, reliable, and direct microbial analyses. In this study, the bioelectrochemical characteristics of C. albicans were investigated for use in an analytical system that determines the viability of the organisms. The electrochemical responses of viable and non-viable cells of C. albicans and Saccharomyces cerevisiae were monitored. Cyclic voltammograms (CV) showed an irreversible oxidation peak at about 750mV that accounts for viable cells. The peak current increased at viable cell numbers ranging from 3×10(5) to 1.6×10(7)cells/ml, indicating that the amount of viable cells can be accurately quantified. To elucidate the underlying electron transfer processes, the influence of electron transfer chain (ETC) - inhibitors on the electrochemical behavior of the two organisms were investigated. Inhibition of the function of classical respiratory chain (CRC) led to a decrease in the electrochemical response, whereas the oxidation current increased when the alternative oxidase (AOX) pathway was blocked by salicylhydroxamic acid (SHA). Blocking the AOX pathway improved the electrochemical performance, suggesting an involvement in the CRC, with cytochrome c oxidase (COX) as a relevant protein complex. Mutants, in which components of COX were deleted, showed a lower electro-activity than the wild-type strain. Particularly, deletion of subunit COX5a almost completely abolished the electrochemical signal. We believe that this work can be utilized for the development of early detection assays and opens the door for new technological developments in the field of C. albicans.en_GB
dc.languageENG-
dc.rightsArchived with thanks to Biosensors & bioelectronicsen_GB
dc.titleDirect electrochemical determination of Candida albicans activity.-
dc.typeArticleen
dc.contributor.departmentHelmholtz Centre for Infection Research, Working Group BiSA, Inhoffenstr. 7, 38124 Braunschweig, Germany; Microanalysis Lab, Applied Organic Chemistry Department, National Research Centre (NRC), Eltahrir Street, 12311-Dokki, Cairo, Egypt. Electronic address: rabeayy@yhaoo.com.en_GB
dc.identifier.journalBiosensors & bioelectronicsen_GB

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