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The aim of this study was to demonstrate the usefulness of T 2 measurements conducted with a time-domain NMR (TD-NMR) for the characterization of active pharmaceutical ingredients (APIs) containing solid dosage forms. A solid dispersion (SD) and a physical mixture (PM) consisting of indomethacin (IMC) and polyvinylpyrrolidone (PVP) were prepared at different weight ratios as test samples, and then their T 2 relaxation curves were measured by TD-NMR. The T 2 relaxation curve of IMC was quite different from that of PVP by nature. T 2 values of the SD and PM samples became gradually shortened with increasing IMC content. No difference in T 2 relaxation curves was observed between SD and PM. By analyzing the T 2 relaxation curves in detail, we succeeded in precisely quantifying the IMC contents incorporated in the samples. Next, this study evaluated the T 2 relaxation curves of amorphous and crystalline states of powdered IMC. T 2 relaxation rate of crystalline IMC was slightly but significantly higher than that of amorphous IMC, proving that the T 2 measurement was sensitive enough to detect these differences. Finally, a thermal stress was imposed on SD and PM samples at 60°C for 7 d, and then an amorphous-to-crystalline transformation occurred in IMC in the PM sample and was successfully monitored by T 2 measurement. We believe that T 2 measurement by TD-NMR is a promising analysis for the characterization of APIs in solid dosage forms, including SD-based pharmaceuticals.

chemical and pharmaceutical bulletin/chemical and pharmaceutical bulletin

&lt;i&gt;T&lt;/i&gt;&lt;sub&gt;2&lt;/sub&gt; Relaxation Study to Evaluate the Crystalline State of Indomethacin Containing Solid Dispersions Using Time-Domain NMR