Valproinsäure EP Verunreinigung L, identifiziert als 2-Methylvaleriansäure, ist eine verzweigtkettige aliphatische Carbonsäure mit der CAS-Nummer 97-61-0, der Summenformel C6H12O2 und einer Molekülmasse von 116,16 g/mol. Im chemischen Kontext von Valproat wird sie als strukturell verwandte Prozessverunreinigung oder als abbauassoziiertes Nebenprodukt betrachtet, das durch Alkylkettenumlagerung oder unvollständige Synthesekontrolle entstehen kann. Aufgrund ihres ähnlichen chromatographischen Verhaltens und der geringen Flüchtigkeit erfordert die exakte Bestimmung typischerweise GC-MS oder GC-FID nach Derivatisierung, während in komplexen Matrizes LC-MS/MS zur bestätigenden Charakterisierung eingesetzt werden kann. Sie gehört nicht zur Klasse genotoxischer Verunreinigungen, ist jedoch für Spezifikationsprofile und die Spurengehaltsbilanz relevant.
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