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Acoustic trapping as a generic non-contact incubation site for multiplex bead-based assays.

Tenje, Maria LU ; Xia, Hongyan; Evander, Mikael LU ; Hammarström, Björn LU ; Tojo, Axel LU ; Belák, Sándor; Laurell, Thomas LU and LeBlanc, Neil (2015) In Analytica Chimica Acta 853. p.682-688
Abstract
In this study, we show a significantly reduced assay time and a greatly increased bead recovery for a commercial Luminex-based multiplex diagnostic immunoassay by performing all liquid handling steps of the assay protocol in a non-contact acoustic trapping platform. The Luminex assay is designed for detecting antibodies in poultry serum for infectious bursal disease virus, infectious bronchitis virus, Newcastle disease virus and avian reovirus. Here, we show proof-of-concept of a microfluidic system capable of being fully automated and handling samples in a parallel format with a miniature physical footprint where the affinity beads are retained in a non-contact levitated mode in a glass capillary throughout the assay protocol. The... (More)
In this study, we show a significantly reduced assay time and a greatly increased bead recovery for a commercial Luminex-based multiplex diagnostic immunoassay by performing all liquid handling steps of the assay protocol in a non-contact acoustic trapping platform. The Luminex assay is designed for detecting antibodies in poultry serum for infectious bursal disease virus, infectious bronchitis virus, Newcastle disease virus and avian reovirus. Here, we show proof-of-concept of a microfluidic system capable of being fully automated and handling samples in a parallel format with a miniature physical footprint where the affinity beads are retained in a non-contact levitated mode in a glass capillary throughout the assay protocol. The different steps are: incubation with the serum sample, secondary antibodies and fluorescent reporters and finally washing to remove any non-specifically bound species. A Luminex 200 instrument was used for the readout. The flow rates applied to the capillary during the initial trapping event and the wash steps were optimised for maximum bead recovery, resulting in a bead recovery of 75% for the complete assay. This can be compared to a bead recovery of approximately 30% when an automatic wash station was used when the assay was performed in the conventional manual format. The time for the incubation steps for a single assay was reduced by more than 50%, without affecting assay performance, since intermediate wash steps became redundant in the continuously perfused bead trapping capillary. We analyzed seven samples, in triplicates, and we can show that the readout of the assay performed in the acoustic trap compared 100% to the control ELISAs (positive or negative readout) and resulted in comparable S/P values as the conventional manual protocol. As the acoustic trapping does not require the particles to have magnetic properties, a greater degree of freedom in selecting microparticles can be provided. In extension, this can provide an opportunity to develop cheaper and more effective microparticles. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Analytica Chimica Acta
volume
853
pages
682 - 688
publisher
Elsevier
external identifiers
  • pmid:25467518
  • wos:000345652000073
  • scopus:84922540277
ISSN
1873-4324
DOI
10.1016/j.aca.2014.07.008
language
English
LU publication?
yes
id
752024fe-1dd3-4b96-b4e0-93d9d1d9f6e8 (old id 4912780)
date added to LUP
2015-01-08 19:36:13
date last changed
2017-04-23 03:16:09
@article{752024fe-1dd3-4b96-b4e0-93d9d1d9f6e8,
  abstract     = {In this study, we show a significantly reduced assay time and a greatly increased bead recovery for a commercial Luminex-based multiplex diagnostic immunoassay by performing all liquid handling steps of the assay protocol in a non-contact acoustic trapping platform. The Luminex assay is designed for detecting antibodies in poultry serum for infectious bursal disease virus, infectious bronchitis virus, Newcastle disease virus and avian reovirus. Here, we show proof-of-concept of a microfluidic system capable of being fully automated and handling samples in a parallel format with a miniature physical footprint where the affinity beads are retained in a non-contact levitated mode in a glass capillary throughout the assay protocol. The different steps are: incubation with the serum sample, secondary antibodies and fluorescent reporters and finally washing to remove any non-specifically bound species. A Luminex 200 instrument was used for the readout. The flow rates applied to the capillary during the initial trapping event and the wash steps were optimised for maximum bead recovery, resulting in a bead recovery of 75% for the complete assay. This can be compared to a bead recovery of approximately 30% when an automatic wash station was used when the assay was performed in the conventional manual format. The time for the incubation steps for a single assay was reduced by more than 50%, without affecting assay performance, since intermediate wash steps became redundant in the continuously perfused bead trapping capillary. We analyzed seven samples, in triplicates, and we can show that the readout of the assay performed in the acoustic trap compared 100% to the control ELISAs (positive or negative readout) and resulted in comparable S/P values as the conventional manual protocol. As the acoustic trapping does not require the particles to have magnetic properties, a greater degree of freedom in selecting microparticles can be provided. In extension, this can provide an opportunity to develop cheaper and more effective microparticles.},
  author       = {Tenje, Maria and Xia, Hongyan and Evander, Mikael and Hammarström, Björn and Tojo, Axel and Belák, Sándor and Laurell, Thomas and LeBlanc, Neil},
  issn         = {1873-4324},
  language     = {eng},
  pages        = {682--688},
  publisher    = {Elsevier},
  series       = {Analytica Chimica Acta},
  title        = {Acoustic trapping as a generic non-contact incubation site for multiplex bead-based assays.},
  url          = {http://dx.doi.org/10.1016/j.aca.2014.07.008},
  volume       = {853},
  year         = {2015},
}