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Open AccessArticle

Evaluation of In-Flow Magnetoresistive Chip Cell—Counter as a Diagnostic Tool

1
SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, CEDEX, 91191 Gif-sur-Yvette, France
2
Service de Pharmacologie et Immunoanalyse (SPI), Laboratoire d’Etudes et de Recherches en Immunoanalyse, CEA, INRA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
3
Direction des Programmes et des Partenariats Publics, Département de la Recherche Fondamentale, CEA, 91191 Gif-sur-Yvette, France
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Biosensors 2019, 9(3), 105; https://doi.org/10.3390/bios9030105
Received: 7 August 2019 / Revised: 27 August 2019 / Accepted: 29 August 2019 / Published: 31 August 2019
(This article belongs to the Special Issue Microfluidics for Biosensing and Diagnostics)
Inexpensive simple medical devices allowing fast and reliable counting of whole cells are of interest for diagnosis and treatment monitoring. Magnetic-based labs on a chip are one of the possibilities currently studied to address this issue. Giant magnetoresistance (GMR) sensors offer both great sensitivity and device integrability with microfluidics and electronics. When used on a dynamic system, GMR-based biochips are able to detect magnetically labeled individual cells. In this article, a rigorous evaluation of the main characteristics of this magnetic medical device (specificity, sensitivity, time of use and variability) are presented and compared to those of both an ELISA test and a conventional flow cytometer, using an eukaryotic malignant cell line model in physiological conditions (NS1 murine cells in phosphate buffer saline). We describe a proof of specificity of a GMR sensor detection of magnetically labeled cells. The limit of detection of the actual system was shown to be similar to the ELISA one and 10 times higher than the cytometer one. View Full-Text
Keywords: diagnostic; GMR sensor; whole cell diagnostic; GMR sensor; whole cell
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Giraud, M.; Delapierre, F.-D.; Wijkhuisen, A.; Bonville, P.; Thévenin, M.; Cannies, G.; Plaisance, M.; Paul, E.; Ezan, E.; Simon, S.; Fermon, C.; Féraudet-Tarisse, C.; Jasmin-Lebras, G. Evaluation of In-Flow Magnetoresistive Chip Cell—Counter as a Diagnostic Tool. Biosensors 2019, 9, 105.

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