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The ToxiSense detection system: A novel centrifugal-based microfluidic (Lab-On-A-Disc) system for detecting cyanobacterial toxin microcystin-LR

Maguire, Ivan and Fitzgerald, Jenny and Heery, Brendan and Murphy, Caroline and Nwankire, Charles and O'Kennedy, Richard and Ducrée, Jens and Regan, Fiona (2015) The ToxiSense detection system: A novel centrifugal-based microfluidic (Lab-On-A-Disc) system for detecting cyanobacterial toxin microcystin-LR. In: EuroAnalysis 2015, 6-10 Sept 2015, Bordeaux, France.

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Abstract

Cyclic peptide cyanobacterial toxins, in particular Microcystis aeruginosa, pose a serious health risk to humans and animals alike [1], [2]. Occurring mostly in fresh and brackish water, they have been identified to cause cancer promotion and liver damage [3]. Herein, we describe a portable, microfluidic-based system for in-situ detection of algal toxins in fresh water. The Atalanta system is a novel, portable and sample-to-answer platform for the detection of toxic cyanobacteria – Microcystin-LR in fresh water. Atalanta utilises the partnership of highly-specific recombinant chicken anti-microcystin antibodies, prepared in-house, with a 3D-printed ‘LASER-photo¬diode’ fluorescent detection method, also developed in-house. A competitive immunoassay format is utilised to detect free toxin. Furthermore, dissolvable-film (DF) based flow-actuation facilitates full assay inte¬gration. This new approach will form the basis of a cost efficient, USB-controlled water quality monitoring system. The Atalanta detection system consists of two components; the microfluidic Atalanta disc and the disc-holder. The Atalanta disc-holder was fabricated and assembled from a 3D-printed casing, with electronic components housed in device. The 5-layered microfluidic disc consists of five reservoirs, each with a separate venti¬lation, aligned radially with inter-connected microchannels. Each reservoir represents a functional assay step. First, microcystin conjugate is coated to the functionalised surface of the reservoir 3 prior to assembling the disc. A freshwater sample in reservoir 1 is pre-incubated with recombinant antibodies labelled with fluorophore (Alexa 647) in reservoir 2. This is then spun into reservoir 3 for detection through a competitive immunoassay using Microcystin-LR. Low fluorescence signal indicates high Microcystin-LR concentration in the sample.

Item Type:Conference or Workshop Item (Lecture)
Event Type:Conference
Refereed:No
Uncontrolled Keywords:Microcystin; Toxin detection; Microfluidics; Lab-On-A-Disc; LOAD; Recombinant antibody technology; Immunofluorescence detection; Low cost diagnostic device
Subjects:Physical Sciences > Analytical chemistry
Physical Sciences > Chemistry
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
DCU Faculties and Schools > Faculty of Science and Health > School of Biotechnology
Research Initiatives and Centres > Marine and Environmental Sensing Technology Hub (MESTECH)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:21248
Deposited On:27 Jun 2016 09:48 by Ivan Maguire. Last Modified 23 Nov 2017 15:38

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