Direct quantification of intraparticle protein diffusion in chromatographic media

Area of Science:

• Biophysical Chemistry
• Chemical Engineering
• Chromatography

Background:

• Protein diffusion in chromatographic media is crucial for designing effective purification strategies.
• Intraparticle diffusion is hindered by the complex porous structure of chromatographic materials.
• Accurate determination of protein diffusion coefficients is essential for process optimization.

Purpose of the Study:

• To introduce and validate Direct Intraparticle Diffusion Analysis (IDA) for measuring protein diffusion coefficients.
• To demonstrate the applicability of IDA across various proteins and chromatographic media.
• To provide a reliable method for understanding diffusion dynamics within porous particles.

Main Methods:

• Utilized confocal laser scanning microscopy (CLSM) to obtain spatially and temporally resolved intraparticle concentration profiles.
• Employed parameter estimation with a spherical diffusion model to determine diffusion coefficients.
• Investigated underivatized chromatographic media to isolate diffusion effects from adsorption.

Main Results:

• IDA successfully determined intraparticle diffusion coefficients for seven different proteins in Sepharose 6 FF.
• Experimental data showed excellent agreement with simulation results.
• Obtained diffusion coefficients were consistent with previously published literature values.

Conclusions:

• IDA is a versatile and accurate method for quantifying protein diffusion in porous chromatographic media.
• The technique is adaptable to different proteins, solution conditions, and stationary phases.
• IDA offers valuable insights for the rational design of chromatography stationary phases and purification schemes.