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Impurity Reference Standards

Nitrosamine Impurities

N-nitrosamine reference standards, including small nitrosamines and nitrosamine drug substance related impurities, for trace LC-MS risk testing.
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Nitrosamine impurities became a regulatory priority after carcinogenic N-nitroso compounds were found in several marketed drugs. Manufacturers must now assess risk and, where needed, test to very low limits. This sub-category supplies the standards for that work, from piperazine-derived nitrosamines such as 1,4-Dinitrosopiperazine, 1-Ethyl-4-nitrosopiperazine and 1-Cyclopentyl-4-nitrosopiperazine to aromatic ones like 1-Nitroso-4-phenylpiperidine.

Testing typically uses LC-MS/MS or GC-MS at nanogram levels, so standard purity and identity must be beyond doubt. Labs also need isotope-labelled internal standards to correct for matrix effects, which appear in our labelled standards sub-category. Each nitrosamine standard carries HPLC purity and structural data from NMR and MS.

Nitrosamines are potent mutagens, so they are packed in sealed vials inside protective secondary packaging and shipped with an SDS detailing safe handling. Quantities are usually 5 mg to 50 mg. Custom synthesis of drug-specific nitrosamines is available for structures not yet listed.

Nitrosamine Impurities: questions buyers ask

What is a nitrosamine drug substance related impurity?
It is a nitrosamine formed from the API itself or a closely related fragment, usually when a secondary or tertiary amine in the molecule reacts with nitrite. Unlike small nitrosamines such as NDMA, these are unique to each drug. Regulators expect them to be assessed and, where present, controlled to compound-specific limits.
How should nitrosamine standards be handled safely?
Treat them as potential carcinogens. Handle neat material in a fume cupboard or ventilated enclosure, wear gloves and eye protection, and weigh quickly into solution. Prepare stock solutions in small volumes and store them cold and dark. Dispose of waste as hazardous chemical waste according to local rules.
Why do nitrosamine methods need labelled internal standards?
Trace analysis by LC-MS/MS is prone to matrix effects, where other components suppress or enhance the signal. A deuterated or 13C labelled analogue behaves almost identically to the analyte and corrects for these effects. This improves accuracy at the very low limits that nitrosamine testing requires.

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