NDLI: Pre-binding dynamic range and sensitivity enhancement for immuno-sensors using nanofluidic preconcentrator

Content Provider	Royal Society of Chemistry (RSC)
Author	Han, Jongyoon Wang, Ying-Chih
Copyright Year	2008
Abstract	Almost all immuno-biosensors are inherently limited by the quality of antibodies available for the target molecule, and obtaining a highly sensitive antibody for a given target molecule is a challenge. We describe a highly efficient and flexible way to enhance immunoassay detection sensitivity and binding kinetics using a nanofluidic based electrokinetic preconcentrator. The device is a microfluidic integration of charge-based biomolecule concentrator and a bead-based immunoassay. Because the preconcentrator can increase the local biomolecule concentration by many orders of magnitude, it gives the immuno-sensor better sensitivity and faster binding kinetics. With a 30 min preconcentration, we were able to enhance the immunoassay sensitivity (with molecular background) by more than 500 fold from higher 50 pM to the sub 100 fM range. Moreover, by adjusting the preconcentration time, we can switch the detection range of the given bead-based assay (from 10–10 000 ng ml−1 to 0.01–10 000 ng ml−1) to have a broader dynamic range of detection. As the system can enhance both detection sensitivity and dynamic range, it can be used to address the most critical detection issues in the detection of common disease biomarkers.
Starting Page	392
Ending Page	394
Page Count	3
File Format	HTM / HTML PDF
ISSN	14730197
Volume Number	8
Issue Number	3
Journal	Lab on a Chip
DOI	10.1039/b717220f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Biomolecule Immunoassay Antibody Zeta potential Dynamic range
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Biochemistry Bioengineering Biomedical Engineering

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