Valproic Acid EP Impurity B, CAS 20225-24-5, is a low-molecular-weight aliphatic carboxylic acid species associated with the valproate impurity profile and represented by formula C7H14O2 with a molecular weight of 130.18 g/mol. Its occurrence is typically linked to route-related side products or oxidative and hydrolytic transformation chemistry arising during synthesis and storage of branched-chain fatty acid derivatives. Because of its structural proximity to the active substance, trace-level determination generally relies on GC-MS, LC-MS/MS, and orthogonal derivatization approaches, with confirmation by high-resolution mass spectrometry when needed. Regulatory evaluation focuses on impurity specification, identity assignment, and stability behavior under pharmacopeial control.
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