Measurement of diffusional parameters in membranes using ATR-FTIR spectroscopy

Area of Science:

• Analytical Chemistry
• Materials Science
• Biophysics

Background:

• Membrane permeability is crucial for drug delivery and biological processes.
• Accurate assessment of membrane transport properties is essential for understanding these phenomena.
• Current methods may have limitations in simultaneously evaluating solvent and solute transport.

Purpose of the Study:

• To describe and validate the use of ATR-FTIR spectroscopy for assessing membrane permeability.
• To demonstrate the feasibility of concurrent solvent and solute permeability measurements.
• To explore the theoretical possibility of deconvoluting diffusion and partition coefficients.

Main Methods:

• Utilized Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR) spectroscopy.
• Measured the diffusion coefficient of acetonitrile in a polydimethylsiloxane membrane.
• Implemented a normalization routine to correct for membrane state changes during permeation.

Main Results:

• Demonstrated reasonable reproducibility in diffusion coefficient measurements.
• Confirmed the feasibility of concurrently measuring solvent and solute permeability.
• Showed theoretical possibility for deconvoluting diffusion and partition coefficients.

Conclusions:

• ATR-FTIR spectroscopy is a viable and reproducible method for evaluating membrane permeability.
• The technique allows for simultaneous assessment of solvent and solute transport.
• This method holds significant potential for routine investigation of membrane permeation phenomena.