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Characterisation of fatty acid multilayers using a TSM biosensor.

M Reason1, G Smith, R Latham

  • 1School of Pharmacy and Pharmaceutical Sciences, De Montfort University, Leicester, UK.

International Journal of Pharmaceutics
|February 17, 2000
PubMed
Summary
This summary is machine-generated.

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Thickness shear mode (TSM) biosensors can measure drug partition coefficients. Characterizing lipid film behavior on TSM sensors is crucial for accurate drug partitioning measurements.

Area of Science:

  • Biosensor technology
  • Pharmaceutical sciences
  • Materials science

Background:

  • Thickness shear mode (TSM) biosensors offer precise measurements for pharmaceutical applications.
  • Understanding lipid film behavior on TSM sensors is essential for drug partition coefficient determination.

Purpose of the Study:

  • To investigate the use of TSM biosensors for measuring drug partition coefficients.
  • To characterize the behavior of fatty acid multilayers as a model system on TSM sensors.

Main Methods:

  • Coating three fatty acid films onto a TSM sensor using a Langmuir-Blodgett trough.
  • Analyzing frequency shifts and impedance spectra of the lipid multilayers.
  • Characterizing viscoelastic properties of thicker membranes.

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Main Results:

  • TSM sensor response showed non-linear frequency shifts at low layer counts, becoming Sauerbrey-like at higher counts.
  • Impedance spectra indicated viscoelastic behavior in thicker lipid membranes.
  • An inverse relationship between fatty acid chain length and frequency shift was observed, linked to surface topography.

Conclusions:

  • Fatty acid multilayers exhibit complex behavior on TSM sensors, influencing measurement accuracy.
  • Thorough characterization of lipid multilayer physical properties is vital before using TSM biosensors for drug partition coefficient measurements.