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Title: Centrifugal microfluidic platform for ultrasensitive detection of botulinum toxin

Journal Article · · Analytical Chemistry
DOI:https://doi.org/10.1021/ac504054u· OSTI ID:1184997
 [1];  [2];  [3];  [4];  [4];  [5];  [5];  [2];  [1]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  2. Sandia National Lab. (SNL-CA), Livermore, CA (United States); Sandstone Diagnostics, Livermore, CA (United States)
  3. Sandia National Lab. (SNL-CA), Livermore, CA (United States); Cepheid, Sunnyvale, CA (United States)
  4. U.S. Dept. of Agriculture - Agricultural Research Service, Albany, CA (United States)
  5. Univ. of Massachusetts, Dartmouth, MA (United States)

In this study, we present an innovative centrifugal microfluidic immunoassay platform (SpinDx) to address the urgent biodefense and public health need for ultrasensitive point-of-care/incident detection of botulinum toxin. The simple, sample-to-answer centrifugal microfluidic immunoassay approach is based on binding of toxins to antibody-laden capture particles followed by sedimentation of the particles through a density-media in a microfluidic disk and quantification by laser-induced fluorescence. A blind, head-to-head comparison study of SpinDx versus the gold-standard mouse bioassay demonstrates 100-fold improvement in sensitivity (limit of detection = 0.09 pg/mL), while achieving total sample-to-answer time of <30 min with 2-μL required volume of the unprocessed sample. We further demonstrate quantification of botulinum toxin in both exogeneous (human blood and serum spiked with toxins) and endogeneous (serum from mice intoxicated via oral, intranasal, and intravenous routes) samples. SpinDx can analyze, without any sample preparation, multiple sample types including whole blood, serum, and food. It is readily expandable to additional analytes as the assay reagents (i.e., the capture beads and detection antibodies) are disconnected from the disk architecture and the reader, facilitating rapid development of new assays. SpinDx can also serve as a general-purpose immunoassay platform applicable to diagnosis of other conditions and diseases.

Research Organization:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
National Institutes of Health (NIH)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1184997
Report Number(s):
SAND-2014-20313J; 547681
Journal Information:
Analytical Chemistry, Vol. 87, Issue 2; ISSN 0003-2700
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 54 works
Citation information provided by
Web of Science

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Cited By (15)

Rapid, Portable, Multiplexed Detection of Bacterial Pathogens Directly from Clinical Sample Matrices journal September 2016
Microfluidics for Biomedical Analysis journal April 2020
A Review of Biomedical Centrifugal Microfluidic Platforms journal February 2016
CD-Based Microfluidics for Primary Care in Extreme Point-of-Care Settings journal January 2016
Measurement of Carcinoembryonic Antigen in Clinical Serum Samples Using a Centrifugal Microfluidic Device journal September 2018
A Rapid, Sensitive, and Portable Biosensor Assay for the Detection of Botulinum Neurotoxin Serotype A in Complex Food Matrices journal November 2018
CD-based microfluidics for primary care in extreme point-of-care settings text January 2016
A novel electromagnet-triggered pillar valve and its application in immunoassay on a centrifugal platform journal January 2019
Rapid Detection of Botulinum Neurotoxins—A Review journal July 2019
Microfluidics‐Implemented Biochemical Assays: From the Perspective of Readout journal September 2019
Applications of antibodies in microfluidics-based analytical systems: challenges and strategies for success journal March 2018
Advances in Reagents Storage and Release in Self‐Contained Point‐of‐Care Devices journal January 2019
A Rapid, Sensitive, and Portable Biosensor Assay for the Detection of Botulinum Neurotoxin Serotype A in Complex Food Matrices posted_content August 2018
Fabrication of a Novel Highly Sensitive and Selective Immunosensor for Botulinum Neurotoxin Serotype A Based on an Effective Platform of Electrosynthesized Gold Nanodendrites/Chitosan Nanoparticles journal May 2017
Qualitative and Quantitative Detection of Botulinum Neurotoxins from Complex Matrices: Results of the First International Proficiency Test journal November 2015

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