Non-destructive Determination of Disintegration Time and Dissolution in Immediate Release Tablets by Terahertz Transmission Measurements
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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].”
From Polymer Pellet Fabrication for Accurate THz-TDS Measurements (2022) · cites this paper as [1]
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].”
From Measuring Open Porosity of Porous Materials Using THz-TDS and an Index-Matching Medium (2020) · cites this paper as [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.”
From A Fast and Non-destructive Terahertz Dissolution Assay for Immediate Release Tablets (2021) · cites this paper as [17]
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.”
From A Fast and Non-destructive Terahertz Dissolution Assay for Immediate Release Tablets (2021) · cites this paper as [17]
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 .”
From A Fast and Non-destructive Terahertz Dissolution Assay for Immediate Release Tablets (2021) · cites this paper as [17]
A previous study found that hardness does not always correlate with porosity, especially for granulated samples.
“Despite our previous study that has revealed that hardness does not always correlate with the porosity (especially for granulated samples) 17 , the current samples have shown excellent correlation between the tensile strength and terahertz-based porosity values (Fig. 6).”
From A Fast and Non-destructive Terahertz Dissolution Assay for Immediate Release Tablets (2021) · cites this paper as [17]
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Nondestructive Inspection of Sinterability of Ceramic Tiles by Terahertz Spectroscopy
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Simple hybrid predictive model for point-of-care pharmaceutical tablet disintegration
Leung, C. K., Bawuah, P., Spiesshofer, N., Kottlan, A., Baumberg, J. J., & Zeitler, J. A. (2026) · Journal of Controlled Release · doi:10.1016/j.jconrel.2026.115190
- 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
- PMC
- PMC5382185
- 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
- hybrid
- doi.org
- Licence
- 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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