ANALYTICAL METHODOLOGY FOR PHARMACEUTICAL EXTRACTABLES AND LEACHABLES: A COMPREHENSIVE APPROACH FOR CONTAINERS AND CLOSURES

Running title: Analytical E&L Methodology in Pharmaceuticals

Abstract

The control of extractables and leachables (E&L) from pharmaceutical packaging and delivery systems is paramount to ensuring patient safety and product quality. This manuscript provides a detailed, comprehensive analytical methodology for the identification, qualification, and quantification of E&L substances from containers and closures used across a wide range of pharmaceutical formulations, including oral liquids, nasal sprays, and injectables. The methodology is meticulously aligned with key international regulatory guidelines from bodies such as the International Council for Harmonization (ICH), the U.S. Food and Drug Administration (FDA), and the United States Pharmacopeia (USP). The core framework encompasses a robust risk assessment, systematic controlled extraction studies, and the application of highly sensitive and orthogonal analytical techniques, including Gas Chromatography-Mass Spectrometry (GC-MS), Liquid Chromatography-Mass Spectrometry (LC-MS), and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). A critical component of the methodology involves the toxicological evaluation of identified compounds and the establishment of science-based acceptance thresholds, such as the Safety Concern Threshold (SCT) and the Qualification Threshold (QT). A detailed case study on a nasal spray formulation highlights the practical application of this methodology from initial sample preparation to data interpretation and regulatory submission. The manuscript also addresses common challenges faced during implementation, such as the analysis of low-level impurities and the absence of commercial reference standards, and proposes practical solutions. Finally, it explores future perspectives for E&L analysis, including the integration of non-targeted screening and in silico toxicology.