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dc.contributor.authorPasco, Neil F.
dc.contributor.authorGoonerate, Ravi
dc.contributor.authorDaniel, Roy M.
dc.contributor.authorCzollner, Andrea
dc.contributor.authorScott, Amy J.
dc.identifier.citationPasco, N.F., Goonerate, R., Daniel, R.M., Czollner, A. & Scott, A.J. (2008). Toxicity assessment of chlorophenols using a mediated microbial toxicity assay. International Journal of Environmental Analytical Chemistry, 88(15), 1063-1075.en_NZ
dc.description.abstractWhile direct toxicity assessment (DTA) is now widely recognised as a useful tool for environmental risk assessment, many existing tests fail to meet end-user needs. This article describes the significant progress made to the MICREDOX® DTA assay, developed at Lincoln Ventures Ltd, brought about by miniaturising this assay to a multi-well plate format combined with limiting current microelectrode transduction. The benefits have been reduced: preparation time, reduced assay time, lower material costs and a higher level of replication achieved. To validate the precision of the miniaturised format, the concentrations required to cause a 50% decrease in signal (EC50) by an archetypal group of toxicants, the chlorophenols, were determined using two terrestrial bacterial strains, Escherichia coli K12 and Klebsiella oxytoca 13183. The assay time was then reduced by stepwise adjustment of the incubation time, from 60 down to 5 min, and the EC50s reported by E. coli to each of the toxicants after 45, 30, 15 and 5 min incubations were determined. The results obtained match closely with those reported by the Activated Sludge Respiration Inhibition Test and confirm the miniaturised multi-well plate MICREDOX® DTA assay reliably reports representative EC50 values for these toxicants. The previously described trends of increasing toxicity with increasing chlorine substitution and the observation that meta-substituted chlorophenols are more toxic than their ortho-substituted counterparts are also confirmed. The ability to monitor toxicity using terrestrial organisms, in volumes amenable to multi-well microtitre plates and incubations requiring only a few minutes, facilitates the rapid generation of highly reproducible, easy to operate and inexpensive DTA measurements.en_NZ
dc.publisherTaylor & Francisen_NZ
dc.rightsThis is an author’s accepted version of an article published in the journal: International Journal of Environmental Analytical Chemistry. © 2008 Taylor & Francis. Used with permission.en_NZ
dc.subjectdirect toxicity assessmenten_NZ
dc.subjectmicroelectrode amperometryen_NZ
dc.subjectEscherichia colien_NZ
dc.subjectKlebsiella oxytocaen_NZ
dc.titleToxicity assessment of chlorophenols using a mediated microbial toxicity assayen_NZ
dc.typeJournal Articleen_NZ
dc.relation.isPartOfInternational Journal of Environmental Analytical Chemistryen_NZ

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