Elemental Impurities in Pharmaceutical Materials Analysis

This technical report details the methodology for determining trace elemental impurities in pharmaceutical substances and products, adhering to the new ICH and USP guidelines. It outlines the significant changes introduced by the United States Pharmacopeia (USP) regarding the testing and control of heavy metal impurities, which have remained largely unchanged for over a century. The report explains the classification of elemental impurities into various classes based on toxicity and the methods for their analysis, including the use of closed vessel microwave digestion and plasma-based spectrochemical techniques. It also discusses the validation protocols necessary for analytical procedures, emphasizing the importance of confirming the appropriateness of the methods used. The report includes specific details on permitted daily exposure (PDE) levels for various elemental impurities, as well as the analytical instrumentation and sample preparation techniques employed in the study. Overall, it serves as a comprehensive guide for laboratories involved in pharmaceutical quality control.