N-Nitrosopiperazin-Monomer, auch Mononitrosopiperazin genannt, ist eine cyclische Nitrosamin-Verunreinigung mit der Summenformel C4H9N3O und einer Molmasse von 115,13 g/mol. Die CAS-Nummer 5632-47-3 bezeichnet dieses N-Nitroso-Derivat von Piperazin, eine Stoffklasse mit potenzieller metabolischer Aktivierung, DNA-Alkylierung und genotoxischer Relevanz im Sinne von ICH M7. Die Entstehung erfolgt häufig unter nitrosierenden Bedingungen während der Synthese oder durch Verunreinigung piperazinhaltiger Vorstufen. Die Strukturaufklärung und Spurenquantifizierung erfordern typischerweise LC-MS/MS oder GC-MS mit auf flüchtige Nitrosamine abgestimmter chromatographischer Trennung und strikter Kontrolle artefaktischer Nitrosierung.
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