Prediction of stability in pharmaceutical preparations. XIV. The complete pH dependent solvolytic degradations of an iodinated nucleoside, the antiviral 5-iodo-2'-deoxyuridine

Liquid chromatographic study of the stability of 5-halogeno-2'-deoxyuridines

The stability of a series of 5-halogeno-2'-deoxyuridines was investigated using liquid chromatography as the analytical technique. Characteristics and profiles of the acidic, neutral and alkaline degradation are described, together with Arrhenius relationships and activation parameters for weakly acidic media.

Simplified method to study stability of pharmaceutical preparations

Data simulating zero-, first-, and simple second- and third-order kinetic reactions are employed at four elevated temperatures. The existence of a linear relationship is established between the logarithm of t0.9 (the time required for the concentration of the reactant remaining to decompose to reach 90% of its original value) and the reciprocal of the corresponding temperature in absolute degrees. The independence of the result from the order of the reaction is reconfirmed using literature data. The application of the linear relationship to predict the shelflife of dosage forms is discussed.