title: High-throughput linear optical stretcher for mechanical characterization of blood cells.
abstract: This study describes a linear optical stretcher as a high-throughput mechanical property cytometer. Custom, inexpensive, and scalable optics image a linear diode bar source into a microfluidic channel, where cells are hydrodynamically focused into the optical stretcher. Upon entering the stretching region, antipodal optical forces generated by the refraction of tightly focused laser light at the cell membrane deform each cell in flow. Each cell relaxes as it flows out of the trap and is compared to the stretched state to determine deformation. The deformation response of untreated red blood cells and neutrophils were compared to chemically treated cells. Statistically significant differences were observed between normal, diamide-treated, and glutaraldehyde-treated red blood cells, as well as between normal and cytochalasin D-treated neutrophils. Based on the behavior of the pure, untreated populations of red cells and neutrophils, a mixed population of these cells was tested and the discrete populations were identified by deformability. © 2015 International Society for Advancement of Cytometry.
authors.affiliation: Chemical and Biological Engineering Department, Colorado School of Mines, Golden, Colorado, 80401.
authors.forename: Kevin B
authors.initials: KB
authors.lastname: Roth
authors.affiliation: Chemical and Biological Engineering Department, Colorado School of Mines, Golden, Colorado, 80401.|Department of Pediatrics, University of Colorado, Denver, Colorado, 80045.
authors.forename: Keith B
authors.initials: KB
authors.lastname: Neeves
authors.affiliation: Department of Physics, Colorado School of Mines, Golden, Colorado, 80401.
authors.forename: Jeff
authors.initials: J
authors.lastname: Squier
authors.affiliation: Chemical and Biological Engineering Department, Colorado School of Mines, Golden, Colorado, 80401.
authors.forename: David W M
authors.initials: DW
authors.lastname: Marr
mesh_terms: D001773:Blood Cells / Q000166:cytology*; D002462:Cell Membrane / Q000473:pathology; D004548:Elasticity / Q000502:physiology; D005434:Flow Cytometry / Q000379:methods; D006801:Humans; D057446:Hydrodynamics; D046210:Microfluidic Analytical Techniques / Q000379:methods; D044085:Microfluidics / Q000379:methods
keywords: Optical stretcher; cell differentiation; cell mechanical properties; deformability cytometry; linear diode bar laser; microfluidics; optical trap