Label-free Sorting

Separation occurs when cells respond differently to a selected intrinsic property, such as size, deformability, density, electrical behavior, or acoustic response. The system exploits that difference through controlled fluid flow or an external field, allowing populations with distinct responses to move toward different outlets. This principle enables enrichment without requiring a fluorescent or magnetic tag.

Fluid flow establishes the paths that carry cells through a microfluidic system, while external fields can influence how cells move within those paths. Their controlled application separates cells according to how they respond to intrinsic characteristics. Because movement is converted into distinct outlet trajectories, the system can collect different cell populations without attaching labels to them.

Avoiding fluorescent, magnetic, or antibody labels reduces sample preparation and helps preserve native cell properties. That matters when separated cells will undergo analysis, culture, or downstream molecular testing, because the workflow does not require the labeling step itself. In medical research, this feature supports handling cells in a state closer to their original sample condition.

The appropriate characteristic depends on which natural differences distinguish the cell populations in the sample. Size, deformability, density, electrical properties, and acoustic response are all usable sorting bases, but they do not provide the same separation mechanism. Selecting a relevant property allows controlled flow or an external field to direct the desired populations into separate outlets.

A workflow directs a heterogeneous cell sample through a microfluidic or related sorting system, applies controlled fluid flow or an external field, and routes cells into separate outlets according to their intrinsic responses. The collected populations can then be enriched for analysis, culture, or downstream molecular testing. The approach avoids a separate fluorescent, magnetic, or antibody-labeling step.

Medical applications include enriching circulating tumor cells, stem cells, immune cell populations, and other rare diagnostic cells. The recovered populations may support analysis, culture, or molecular testing, including uses in liquid biopsy and individualized diagnostics. The same label-free strategy also contributes to cell-therapy workflows by simplifying preparation while reducing perturbation of the collected cells.