title: Elastomeric negative acoustic contrast particles for affinity capture assays.
abstract: 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 cross-linking 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.
authors: Department of Chemical and Nuclear Engineering, Center for Biomedical Engineering, The University of New Mexico, Albuquerque, New Mexico 87131, United States.
authors: Kevin W
authors: KW
authors: Cushing
authors: Menake E
authors: ME
authors: Piyasena
authors: Nick J
authors: NJ
authors: Carroll
authors: Gian C
authors: GC
authors: Maestas
authors: Beth Ann
authors: BA
authors: López
authors: Bruce S
authors: BS
authors: Edwards
authors: Steven W
authors: SW
authors: Graves
authors: Gabriel P
authors: GP
authors: López
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D015415:Biomarkers / Q000032:analysis / Q000097:blood; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D020724:Elastomers; D005434:Flow Cytometry / Q000379:methods*; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood; D051379:Mice; D046210:Microfluidic Analytical Techniques; D008863:Microspheres; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D017430:Prostate-Specific Antigen / Q000032:analysis*; D013552:Swine
chemical_list: D000911:Antibodies, Monoclonal; D015415:Biomarkers; D004129:Dimethylpolysiloxanes; D020724:Elastomers; D007074:Immunoglobulin G; D011108:Polymers; C036925:elastomeric polymer; D017430:Prostate-Specific Antigen