Sensitive Readout for Microfluidic High-Throughput Applications using Scanning SQUID Microscopy

Shai Wissberg, Maria Ronen, Ziv Oren, Doron Gerber, Beena Kalisky

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Microfluidic chips provide a powerful platform for high-throughput screening of diverse biophysical systems. The most prevalent detection methods are fluorescence based. Developing new readout techniques for microfluidics focusing on quantitative information in the low signal regime is desirable. In this work, we combine the well-established immunoassay approach, with magnetic nanoparticles, with a highly sensitive magnetic imaging technique. We offer to integrate a microfluidic array into a scanning superconducting quantum interference device (SQUID) microscope, to image nanoparticles that were moved through the microfluidic device. We demonstrate the technique on protein-protein interactions (PPI). We compare sensitivity to that of a conventional readout, quantify the amount of interactions, and demonstrate 0.1 atto-mole sensitivity. Our work serves as a proof of concept that will promote the development of a new set of eyes, a stable usable microfluidic-scanning SQUID microscopy.

Original languageEnglish
Article number1573
JournalScientific Reports
Issue number1
StatePublished - 31 Jan 2020

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© 2020, The Author(s).


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