Issue 19, 2019

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

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

Supplementary files

Article information

Article type
Paper
Submitted
25 Janv. 2019
Accepted
08 Apr. 2019
First published
10 Apr. 2019
This article is Open Access
Creative Commons BY-NC license

Anal. Methods, 2019,11, 2542-2550

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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