Staining kinetics in single cells. Part I. Influence of convective diffusion on the staining rate

Area of Science:

• Biophysics
• Cell Biology
• Physical Chemistry

Background:

• Understanding cellular staining kinetics is crucial for various biological and medical applications.
• Previous studies often lacked detailed characterization of the hydrodynamic influences on staining processes.
• Investigating single-cell dynamics requires precise control over experimental conditions.

Purpose of the Study:

• To investigate the staining kinetics of single cells.
• To characterize the physicochemical hydrodynamics governing the staining process.
• To determine the influence of flow rate on boundary layer formation and staining rates.

Main Methods:

• Utilized a perfusion cuvette system integrated with a computer-controlled microscope spectrometer.
• Employed steady-state laminar flow parallel to the cell surface.
• Measured and analyzed hydrodynamic and diffusional boundary layer thicknesses.

Main Results:

• Physicochemical hydrodynamics of single-cell staining were successfully characterized.
• Observed hydrodynamic and diffusional boundary layers dependent on the flow rate.
• Experimental data for diffusional boundary layer thickness aligned with theoretical calculations.
• Identified specific hydrodynamic conditions where convective diffusion no longer impacts staining rate.

Conclusions:

• Flow rate is a critical parameter controlling boundary layer formation in single-cell staining.
• Convective diffusion's effect on staining kinetics can be eliminated under optimized hydrodynamic conditions.
• The study provides a foundation for precise control and optimization of cellular staining protocols.