[Evaluation of Photostability of Small Molecular Compounds with Solid-state UV Spectra].

It is crucial to evaluate the photostability of drugs. However, it requires a longer period of time to evaluate the photodegradation of compounds because extended light exposure to the compound is required to detect photodegradation products with the help of the commonly utilized technique of chromatography. Therefore, a simple and easy approach to estimate the photostability of the compound is required particularly for the initial screening of the drug candidates.

A New Method for Classification of Salts and Cocrystals Using Solid-State UV Spectrophotometry.

Salt and cocrystal formulations are widely used as techniques to improve physicochemical properties of compounds. Some spectrometric techniques to distinguish cocrystals from salts have been reported; however, it has not been possible to adapt these formulations with many compounds, because of limitations, high difficulty, and exceptions. Therefore, we focused on the possibility of UV spectrometry, which had not been reported as a classification technique for salts and cocrystals.

Utility of Solid-State UV/Vis Spectra on the Evaluation of Photostability of Indomethacin Crystals.

Evaluating the stability of drugs over ranges of various environmental conditions is necessary to ensure the quality of the drug throughout the shelf life. In this study, we used indomethacin, which is well known as a photosensitive drug, and evaluated the photostability of prepared crystals. HPLC analysis revealed that all the indomethacin crystals were degraded by light exposure.