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Time-resolved NIR spectroscopy for quantitative analysis of intact pharmaceutical tablets.

Christoffer Abrahamsson1, Jonas Johansson, Stefan Andersson-Engels

  • 1Department of Physics, Lund Institute of Technology, SE-221 00 Lund, Sweden. christoffer.abrahamsson@fysik.lth.se

Analytical Chemistry
|April 30, 2005
PubMed
Summary

Time-resolved near-infrared (NIR) spectroscopy improves quantitative analysis of intact tablets by separating absorption and scattering properties. This advanced technique offers significantly better prediction accuracy compared to conventional NIR methods.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Near-infrared (NIR) spectroscopy is valuable for analyzing intact tablets.
  • Conventional NIR transmission spectroscopy is sensitive to sample physical property variations, limiting accuracy.
  • Physical changes in tablet samples significantly impact spectral data.

Purpose of the Study:

  • To apply time-resolved transmission NIR spectroscopy for quantitative measurements of intact tablets.
  • To overcome limitations of conventional NIR spectroscopy related to sample physical property variations.
  • To enhance the accuracy and robustness of quantitative analysis for pharmaceutical formulations.

Main Methods:

  • Utilized time-resolved transmission NIR spectroscopy with a pulsed Ti:sapphire laser and nonlinear photonic crystal fiber light source.

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  • Employed a time-resolving streak camera to measure transmitted light through tablet samples.
  • Developed Partial Least Squares (PLS) models using data from both time-resolved and conventional NIR techniques.

    • Main Results:

    • Time-resolved NIR spectroscopy effectively separated absorption and scattering properties of the samples.
    • PLS models based on time-resolved data showed a 5-fold improvement in sample prediction accuracy compared to conventional NIR.
    • The time-resolved technique demonstrated enhanced ability to predict samples with physical properties outside the calibration set.

    Conclusions:

    • Time-resolved transmission NIR spectroscopy offers superior quantitative analysis of intact tablets.
    • This method provides better handling of variations in physical parameters like thickness and composition.
    • The technique enhances predictive capabilities, even for samples with properties not present in the initial calibration data.