| Elastomeric Negative Acoustic Contrast Particles for Affinity Capture Assays. | |
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MedLine Citation:
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PMID: 23331264 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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This report describes the development of elastomeric capture microparticles (ECµPs) and their use with acoustophoretic separation to perform microparticle assays via flow cytometry. We have developed simple methods to form ECµPs by crosslinking droplets of common commercially available silicone precursors in suspension followed by surface functionalization with biomolecular recognition reagents. The ECµPs are compressible particles that exhibit negative acoustic contrast in ultrasound when suspended in aqueous media, blood serum or diluted blood. In this study, these particles have been functionalized with antibodies to bind prostate specific antigen and immunoglobulin (IgG). Specific separation of the ECµPs from blood cells is achieved by flowing them through a microfluidic acoustophoretic device that uses an ultrasonic standing wave to align the blood cells, which exhibit positive acoustic contrast, at a node in the acoustic pressure distribution while aligning the negative acoustic contrast ECµPs at the antinodes. Laminar flow of the separated particles to downstream collection ports allows for collection of the separated negative contrast (ECµPs) and positive contrast particles (cells). Separated ECµPs were analyzed via flow cytometry to demonstrate nanomolar detection for prostate specific antigen in aqueous buffer and picomolar detection for IgG in plasma and diluted blood samples. This approach has potential applications in the development of rapid assays that detect the presence of low concentrations of biomarkers in a number of biological sample types. |
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Authors:
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Kevin W Cushing; Menake E Piyasena; Nick J Carroll; Gian C Maestas; Beth Ann Lopez; Bruce S Edwards; Steven W Graves; Gabriel P Lopez |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2013-1-21 |
Journal Detail:
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Title: Analytical chemistry Volume: - ISSN: 1520-6882 ISO Abbreviation: Anal. Chem. Publication Date: 2013 Jan |
Date Detail:
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Created Date: 2013-1-21 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0370536 Medline TA: Anal Chem Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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