Deterministic Migration-Based Separation of White Blood Cells.

Separating white blood cells from whole blood remains a clinical challenge. Traditional methods are slow and labor-intensive, limiting their use in routine diagnostics. Prior research has shown that centrifugation and density gradient techniques are commonly used but lack speed and scalability. These methods often alter cell function or viability, reducing their utility for downstream analyses. A need exists for faster, more efficient separation that preserves cell integrity. No prior work had resolved the issue of high-throughput separation without functional compromise. This gap motivated the development of alternative platforms. Researchers have explored microfluidic systems for cell sorting, but deterministic migration remains underexplored. This paper introduces a novel approach to address these limitations.

The study aimed to develop a microfluidic platform for deterministic migration of white blood cells. The goal was to enable rapid separation of these cells from unprocessed whole blood. The specific problem addressed was the inefficiency of current clinical methods. The motivation was to improve diagnostic workflows by reducing processing time. The platform was designed to preserve cell function and viability. The researchers focused on creating a high-throughput solution. They tested the system under various rheological conditions. The ultimate aim was to provide a tool for functional and phenotypic analyses.

The platform uses slant ridge structures on a channel top to guide cell migration. These structures create directional cues for white blood cells. The device was fabricated using standard microfluidic techniques. Whole blood samples were processed without prior treatment. The migration efficiency was assessed under different flow rates. Cell composition was analyzed using flow cytometry. Cytokine secretion was measured to evaluate functional integrity. The system's throughput was tested with volumes up to 1 mL.

The platform achieved separation of white blood cells in less than 7 minutes per mL. Lymphocyte subpopulations remained well preserved in the separated sample. T cells maintained their cytokine secretion capacity. The system operated efficiently at whole blood viscosity. Migration efficiency reached over 90% in tests. No significant cell loss was observed during processing. The device maintained cell viability and function. These results suggest the platform's potential for clinical use.

The platform demonstrates deterministic migration of white blood cells in whole blood. It enables high-throughput separation without functional impairment. The system preserves lymphocyte subpopulations and T cell function. The results suggest this method is suitable for clinical diagnostics. The platform's efficiency supports rapid cell enrichment. It may improve functional and phenotypic analyses. The findings propose a new approach to white blood cell separation. This method may reduce reliance on traditional, slower techniques.