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A microflow cytometer for microsphere-based immunoassays using integrated optics and inertial particle focussing

A microflow cytometer for microsphere-based immunoassays using integrated optics and inertial particle focussing
A microflow cytometer for microsphere-based immunoassays using integrated optics and inertial particle focussing
We present work towards a microflow cytometer for performing multiplex immunoassays using commercially available fluorescently-labelled microspheres. The device consists of a silica chip with integrated GeO2:SiO2 channel waveguides which deliver excitation light orthogonally to an etched flow channel [1], [2]. The rectangular cross section, 2:1 aspect ratio flow channel and flow rate create an inertial focussing effect on the microspheres [3] which ensures they flow through the plane of maximum optical excitation, halfway up the height of the channel, with minimal positional variation.
The optical waveguide core is fabricated by magnetron sputtering of GeO2:SiO2 films which are then etched to form channel waveguides by ICP etching. The silica cladding, up to 13.5 µm thick, is deposited by either flame hydrolysis deposition or a combination of magnetron sputtering followed by PECVD. Fluidic channels are etched with ICP etching. Channels with the dimensions of 14.1 µm x 27.5 µm and near vertical sidewalls (91°±4°) have been produced in silica as shown in the cross section in Figure 1A. Figure 1B shows a device with the fluidic channel etched through waveguides clad with PECVD silica.
Design parameters were established with PDMS test channels 25.5 µm deep by 12.2 µm wide. Figures 2A and 2B show transmission fluorescence imaging of streaks from multiple 5.6µm diameter microspheres flowing at 0.49 m/s down the fluidic channel. The microspheres are shown to be focused into a tight stream at 15 mm from the channel entrance in Figure 2C, indicating the minimum channel length required for the final devices.
Future work will include dual channel quantification of microsphere fluorescence and development of an assay for TNFalpha and later multiplex measurements. Collection of fluorescence with channel waveguides and also characterisation of transmission measurements from flowing microspheres will also be studied.
Butement, J.T.G.
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Hunt, H.C.
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Rowe, D.J.
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Karabchevsky, Alina
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Hua, P.
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Murugan, G.S.
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Clark, O.
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Holmes, C.
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Carpenter, L.G.
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Gates, J.C.
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Smith, P.G.R
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Chad, J.E.
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Wilkinson, J.S.
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Butement, J.T.G.
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Hunt, H.C.
b58afe40-9102-4a47-8d81-1fdd5463f4fe
Rowe, D.J.
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Karabchevsky, Alina
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Hua, P.
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Murugan, G.S.
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Clark, O.
d2b922ab-3d98-42fc-97d9-042644666f73
Holmes, C.
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Carpenter, L.G.
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Gates, J.C.
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Smith, P.G.R
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Chad, J.E.
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Wilkinson, J.S.
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Butement, J.T.G., Hunt, H.C., Rowe, D.J., Karabchevsky, Alina, Hua, P., Murugan, G.S., Clark, O., Holmes, C., Carpenter, L.G., Gates, J.C., Smith, P.G.R, Chad, J.E. and Wilkinson, J.S. (2014) A microflow cytometer for microsphere-based immunoassays using integrated optics and inertial particle focussing. Biosensors '14, Australia. 27 - 30 May 2014.

Record type: Conference or Workshop Item (Paper)

Abstract

We present work towards a microflow cytometer for performing multiplex immunoassays using commercially available fluorescently-labelled microspheres. The device consists of a silica chip with integrated GeO2:SiO2 channel waveguides which deliver excitation light orthogonally to an etched flow channel [1], [2]. The rectangular cross section, 2:1 aspect ratio flow channel and flow rate create an inertial focussing effect on the microspheres [3] which ensures they flow through the plane of maximum optical excitation, halfway up the height of the channel, with minimal positional variation.
The optical waveguide core is fabricated by magnetron sputtering of GeO2:SiO2 films which are then etched to form channel waveguides by ICP etching. The silica cladding, up to 13.5 µm thick, is deposited by either flame hydrolysis deposition or a combination of magnetron sputtering followed by PECVD. Fluidic channels are etched with ICP etching. Channels with the dimensions of 14.1 µm x 27.5 µm and near vertical sidewalls (91°±4°) have been produced in silica as shown in the cross section in Figure 1A. Figure 1B shows a device with the fluidic channel etched through waveguides clad with PECVD silica.
Design parameters were established with PDMS test channels 25.5 µm deep by 12.2 µm wide. Figures 2A and 2B show transmission fluorescence imaging of streaks from multiple 5.6µm diameter microspheres flowing at 0.49 m/s down the fluidic channel. The microspheres are shown to be focused into a tight stream at 15 mm from the channel entrance in Figure 2C, indicating the minimum channel length required for the final devices.
Future work will include dual channel quantification of microsphere fluorescence and development of an assay for TNFalpha and later multiplex measurements. Collection of fluorescence with channel waveguides and also characterisation of transmission measurements from flowing microspheres will also be studied.

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e-pub ahead of print date: 2014
Venue - Dates: Biosensors '14, Australia, 2014-05-27 - 2014-05-30
Organisations: Optoelectronics Research Centre, Centre for Biological Sciences

Identifiers

Local EPrints ID: 366101
URI: https://eprints.soton.ac.uk/id/eprint/366101
PURE UUID: bd414a46-b4cf-4057-a616-ecfb3f349962
ORCID for D.J. Rowe: ORCID iD orcid.org/0000-0002-1167-150X
ORCID for G.S. Murugan: ORCID iD orcid.org/0000-0002-2733-3273
ORCID for C. Holmes: ORCID iD orcid.org/0000-0001-9021-3760
ORCID for J.C. Gates: ORCID iD orcid.org/0000-0001-8671-5987
ORCID for P.G.R Smith: ORCID iD orcid.org/0000-0003-0319-718X
ORCID for J.E. Chad: ORCID iD orcid.org/0000-0001-6442-4281
ORCID for J.S. Wilkinson: ORCID iD orcid.org/0000-0003-4712-1697

Catalogue record

Date deposited: 24 Jun 2014 11:15
Last modified: 17 Oct 2019 00:38

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Contributors

Author: J.T.G. Butement
Author: H.C. Hunt
Author: D.J. Rowe ORCID iD
Author: Alina Karabchevsky
Author: P. Hua
Author: G.S. Murugan ORCID iD
Author: O. Clark
Author: C. Holmes ORCID iD
Author: L.G. Carpenter
Author: J.C. Gates ORCID iD
Author: P.G.R Smith ORCID iD
Author: J.E. Chad ORCID iD
Author: J.S. Wilkinson ORCID iD

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