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A Quantitative Study Of Drug Recrystallization In Drug-In-Adhesive Transdermal Patches Using Vibrational Spectroscopy, Yi Li
Electronic Theses and Dissertations
Drug-in-adhesive (DIA) transdermal patches are an important type of transdermal drug delivery system (TDDS). The drugs used in the DIA system are frequently present in metastable forms, such as amorphous solids or supercooled liquids. These drug states are thermodynamically unstable and tend to undergo recrystallization. Recrystallization of the active pharmaceutical ingredient can adversely affect the efficacy of transdermal products. This dissertation demonstrates a systematic approach to quantify the crystalline content of the API in DIA systems. This approach uses a novel method of preparing calibration standards and a spectroscopic method to reliably predict crystalline content in DIA patches. Spectroscopic tools, …