Cited by 73Terahertz technology and applicationsAnalytical Methods in PharmaceuticalsDrug Solubulity and Delivery Systems

Non-destructive Determination of Disintegration Time and Dissolution in Immediate Release Tablets by Terahertz Transmission Measurements

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Markl, Daniel, Sauerwein, Johanna, Goodwin, Daniel J., van den Ban, Sander, Zeitler, J. Axel·2017·Pharmaceutical Research

Abstract

The aim of this study was to establish the suitability of terahertz (THz) transmission measurements to accurately measure and predict the critical quality attributes of disintegration time and the amount of active pharmaceutical ingredient (API) dissolved after 15, 20 and 25 min for commercial tablets processed at production scale. Samples of 18 batches of biconvex tablets from a production-scale design of experiments study into exploring the design space of a commercial tablet manufacturing process were used. The tablet production involved the process steps of high-shear wet granulation, fluid-bed drying and subsequent compaction. The 18 batches were produced using a 4 factor split plot design to study the effects of process changes on the disintegration time. Non-destructive and contactless terahertz transmission measurements of the whole tablets without prior sample preparation were performed to measure the effective refractive index and absorption coefficient of 6 tablets per batch. The disintegration time (R 2 = 0.86) and API dissolved after 15 min (R 2 = 0.96) linearly correlates with the effective refractive index, n eff, measured at terahertz frequencies. In contrast, no such correlation could be established from conventional hardness measurements. The magnitude of n eff represents the optical density of the sample and thus it reflects both changes in tablet porosity as well as granule density. For the absorption coefficient, α eff, we observed a better correlation with dissolution after 20 min (R 2 = 0.96) and a weaker correlation with disintegration (R 2 = 0.83) compared to n eff. The measurements of n eff and α eff provide promising predictors for the disintegration and dissolution time of tablets. The high penetration power of terahertz radiation makes it possible to sample a significant volume proportion of a tablet without any prior sample preparation. Together with the short measurement time (seconds), the potential to measure content uniformity and the fact that the method requires no chemometric models this technology shows clear promise to be established as a process analyser to non-destructively predict critical quality attributes of tablets.

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  • Sample porosity must be minimised because it affects the accuracy of the refractive index obtained from terahertz measurements.

    “Sample porosity must be minimised as it affects the accuracy of the RI obtained from terahertz measurements [1,9,10,14,20,21].”
  • The rise in disintegration time is primarily attributed to decreasing porosity and changes in pore structure.

    “This is primarily attributed to the decreasing porosity (Figure 7b) and also to changes in the pore structure [29].”
  • Porosity is a dependable and essential quality attribute for tablets, and it governs the mass transport processes behind disintegration and dissolution.

    “Tablet porosity is a reliable and fundamental critical quality attribute which controls key mass transport mechanisms that govern disintegration and dissolution behaviour.”
  • Earlier work reported a strong relationship between THz-derived porosity or effective refractive index and dissolution behavior of IR tablets.

    “a previous work by Markl et al. 17 has established a strong correlation between the measured terahertz effective refractive index/porosity and the drug dissolution characteristics of IR tablets.”
  • A reason reliable dissolution prediction is hard is that earlier techniques do not directly measure bulk tablet properties like porosity, which control mass transport during disintegration and release.

    “This is due to the inability of these methods to directly probe and quantify the bulk physical properties of tablets, e.g.porosity, that directly govern mass transport mechanisms in a tablet during its disintegration and subsequent drug release 16,17 .”

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Authors
Markl, D., Sauerwein, J., Goodwin, D. J., van den Ban, S., & Zeitler, J. A.
Affiliations
  • University of Cambridge (GB)
  • GlaxoSmithKline (United Kingdom) (GB)
Corresponding author
Zeitler, J. Axel
Venue
Pharmaceutical Research
Published
2017-02-02
Volume
34
Issue
5
Pages
1012-1022
ISSN
  • 0724-8741 (ISSN-L)
  • 1573-904X
OpenAlex
W2585936721
Cited by
73
References
27
Citations by year
2026: 5 · 2025: 7 · 2024: 12 · 2023: 9 · 2022: 3 · 2021: 5 · 2020: 13 · 2019: 7 · 2018: 5 · 2017: 7
FWCI
3.63
Type
journal article
Language
en
Open access
Locations
  • Pharmaceutical Research (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Strathprints: The University of Strathclyde institutional repository (University of Strathclyde) (acceptedVersion)
  • Apollo (University of Cambridge) (submittedVersion, cc-by)
  • Apollo (cc-by)
Funders
  • Engineering and Physical Sciences Research Council (EP/L019922/1)
  • Deutscher Akademischer Austauschdienst (GB-PH-1870)
Topics
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Terahertz technology and applications
  • Physical Sciences › Chemistry › Analytical Chemistry › Analytical Methods in Pharmaceuticals
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmaceutical Science › Drug Solubulity and Delivery Systems
Keywords
terahertz transmission, disintegration time, tablet dissolution, immediate release tablets, effective refractive index, absorption coefficient, critical quality attributes, process analytical technology, non-destructive measurement, high shear wet granulation, fluidized bed drying, tablet porosity, content uniformity, active pharmaceutical ingredients
MeSH terms
Pharmaceutical Preparations, Hardness, Solubility, Tablets, Terahertz Imaging, Drug Liberation

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