Ion concentration polarization (ICP) of proteins at silicon micropillar nanogaps


Autoři: Bochao Lu aff001;  Michel M. Maharbiz aff001
Působiště autorů: UC Berkeley-UCSF Graduate Program in Bioengineering, University of California–Berkeley, Berkeley, California, United States of America aff001;  Electrical Engineering and Computer Science Department, University of California–Berkeley, Berkeley, California, United States of America aff002;  Chan Zuckerberg Biohub, San Francisco, California, United States of America aff003
Vyšlo v časopise: PLoS ONE 14(11)
Kategorie: Research Article
doi: 10.1371/journal.pone.0223732

Souhrn

Fast detection of low-abundance protein remains a challenge because detection speed is limited by analyte transport to the detection site of a biosensor. In this paper, we demonstrate a scalable fabrication process for producing vertical nanogaps between micropillars which enable ion concentration polarization (ICP) enrichment for fast analyte detection. Compared to horizontal nanochannels, massively paralleled vertical nanogaps not only provide comparable electrokinetics, but also significantly reduce fluid resistance, enabling microbead-based assays. The channels on the device are straightforward to fabricate and scalable using conventional lithography tools. The device is capable of enriching protein molecules by >1000 fold in 10 min. We demonstrate fast detection of IL6 down to 7.4 pg/ml with only a 10 min enrichment period followed by a 5 min incubation. This is a 162-fold enhancement in sensitivity compared to that without enrichment. Our results demonstrate the possibility of using silicon/silica based vertical nanogaps to mimic the function of polymer membranes for the purpose of protein enrichment.

Klíčová slova:

Cations – Fluorescence imaging – Chemical deposition – Immunoassays – Manufacturing processes – Microbeads – Microfluidics – Bionanotechnology


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