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Issue 19, 2019
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An integrated homogeneous SPARCL™ immunoassay for rapid biomarker detection on a chip

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Abstract

We developed an integrated version of the homogeneous SPARCL™ (Spatial Proximity Analyte Reagent Capture Luminescence) immunoassay for rapid measurement of biomarkers on a chip. Our development is based on a simple microfluidic design with on-chip preserved dry reagents. The assay requires no washing steps and can be performed in a “mix-and-read” format. A syringe pump and a luminometer supported the detection. Only one manual pipetting step is necessary to load the sample onto the chip, and the entire incubation and measurement can be accomplished in approximately 35 min. We have demonstrated the application of the SPARCL™ on a chip to the quantitative detection of the tissue inhibitor of metalloproteinases 1 (TIMP-1) in spiked mock samples and a limited number of gingival crevicular fluid specimens. The integrated SPARCL™ assay could detect as little as 49.3 pg ml−1 (1.76 pM) TIMP1. To our knowledge, this is the first demonstration of the fully integrated homogeneous SPARCL™ immunoassay in a lab-on-a-chip. Further, we discuss the optimization of the chip and the assay in order to improve its analytical performance.

Graphical abstract: An integrated homogeneous SPARCL™ immunoassay for rapid biomarker detection on a chip

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Supplementary files

Article information


Submitted
25 Jan 2019
Accepted
08 Apr 2019
First published
10 Apr 2019

This article is Open Access

Anal. Methods, 2019,11, 2542-2550
Article type
Paper

An integrated homogeneous SPARCL™ immunoassay for rapid biomarker detection on a chip

N. Sandetskaya, N. Isserstedt-John, A. Kölsch, S. Schattschneider and D. Kuhlmeier, Anal. Methods, 2019, 11, 2542
DOI: 10.1039/C9AY00198K

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