Authors:

Mary Jane Sayler

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About Paper:

Reconstitution of lyophilized drugs is an essential step prior to administration. Accurate determination of reconstitution time is critical for supporting formulation development and ensuring patient safety. Traditional methods for measuring reconstitution time rely on visually identifying the endpoint, which can introduce variability and potentially harmful errors. In this study, a light emitting diode (LED)-based method is proposed as a more objective alternative. The method uses an LED whose signal is initially blocked by the intact sample. As the product dissolves with the addition of water, changes in light transmission through the vial are detected by a phototransistor. The endpoint is numerically defined as the point at which transmitted light reaches a maximum and its rate of change becomes zero. This study compares traditional lyophilized cakes and lyophilized beads to evaluate differences in their reconstitution behaviors. Early results show clear differences between the two forms. A better understanding of the reconstitution mechanisms of different solid forms can help inform future formulation design and optimization of the reconstitution process in industry settings. Keywords: Phamasuidicals; Freeze-Drying; Optical Transmission; Dissolution; LED

Source:

Purdue University / 2025

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Co-authors:

Mary Jane Sayler