Build a molecule and process risk map
Identify plausible deletion, insertion, truncation, epimeric, oxidation, deamidation, aggregation, adduct, and conjugation-related variants. Map each risk to the operation that can create or enrich it and to the point where it can be detected or controlled.
Use orthogonal methods for different questions
RP-HPLC may provide the main purity and related-substance view, while LC-MS supports identity and mass assignment. Other approaches may be required when closely related species are not adequately resolved by the primary method.
Let specifications evolve with knowledge
Early development limits may be broader. As route knowledge, batch history, method capability, stability data, and regulatory context grow, the specification can become more discriminating and better justified.
Design for method lifecycle and transfer
Record sample preparation, system suitability, integration rules, reference standards, known interferences, robustness findings, and unresolved limitations. Transfer readiness depends on reproducing analytical intent, not merely copying a procedure.