Non-destructive quantification of pharmaceutical tablet coatings using terahertz pulsed imaging and optical coherence tomography |
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Authors: | Shuncong Zhong Yao-Chun Shen Louise Ho Robert K MayJ Axel Zeitler Mike EvansPhilip F Taday Michael PepperThomas Rades Keith C GordonRonny Müller Peter Kleinebudde |
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Institution: | a Department of Electrical Engineering and Electronics, University of Liverpool, L69 3GJ, UK b School of Pharmacy, University of Otago, P.O. Box 56 Dunedin, New Zealand c TeraView, Ltd., St. John’s Innovation Park, Cambridge CB4 0WS, UK d Department of Chemical Engineering and Biotechnology, University of Cambridge, CB2 3RA, UK e MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Chemistry, University of Otago, P.O. Box 56 Dunedin, New Zealand f Institute of Pharmaceutics and Biopharmaceutics, Heinrich-Heine-University, D-40225, Germany |
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Abstract: | Optical coherence tomography (OCT) and terahertz pulsed imaging (TPI) are two powerful techniques allowing high quality cross-sectional images from within scattering media to be obtained non-destructively. In this paper, we report experimental results of using OCT and TPI for quantitatively characterizing pharmaceutical tablet coatings in the thickness range of 10-140 μm. We found that the spectral OCT system developed in-house has an axial resolution of 0.9 μm, and is capable of quantifying very thin coatings in the range of 10-60 μm. The upper limit of 60 μm within the tablet coating and core is owed to the strong scattering of OCT light, which has relatively short wavelengths in the range of 0.5-1.0 μm. On the other hand, TPI utilizes terahertz radiation that has substantially long wavelengths in the range of hundreds of microns, and thus is less prone to the scattering problem. Consequently TPI has been demonstrated to be able to quantify thicker coatings in the range of 40-140 μm and beyond. We concluded that OCT and TPI are two complementary analytical techniques for non-destructive and quantitative characterization of pharmaceutical tablet coatings. |
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Keywords: | Non-destructive testing Optical coherence tomography Terahertz pulsed imaging Tablet coating thickness |
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