Analytical Detection of Nitrosamine Contaminants

The analytical detection of nitrosamine contaminants has become a cornerstone of pharmaceutical quality control and public health protection. Nitrosamines, a class of potent genotoxic impurities, arise through nitrosation reactions of secondary and tertiary amines under acidic conditions and may contaminate drugs, food, water and cosmetics at trace levels. Robust detection demands high sensitivity, specificity and reproducibility to meet stringent regulatory thresholds. Key strategies combine selective sample preparation—often via solid-phase extraction or precipitation—with chromatographic separation and mass spectrometric detection. Recent developments have focused on minimising matrix interferences, lowering detection limits to the ng/kg range and enabling high-throughput screening to support both routine monitoring and forced-degradation studies. These advances underpin risk assessment, guide mitigation of manufacturing processes that foster nitrosation, and ensure compliance with global safety standards.

Research from Nature Portfolio

Recent studies have refined chromatographic and mass-spectrometric platforms to enhance sensitivity and throughput in nitrosamine detection within pharmaceutical substances. One notable work developed an HPLC method with UV detection optimised for simultaneous elution of API and N-nitrosodimethylamine, achieving a limit of quantification below 0.03 µg/mL and excellent linearity across a broad concentration range. The approach demonstrated consistent accuracy and precision when applied to recalled drug batches and surveillance samples, offering a rapid screening tool for quality control laboratories. By integrating streamlined sample clean-up and efficient elution protocols, this method supports large-scale screening without compromising selectivity or robustness.

Analytical Detection of Nitrosamine Contaminants publication trend

The graph below shows the total number of articles in analytical detection of nitrosamine contaminants across all publications each year (not limited to Nature Index journals).

Technical terms

N-nitrosodimethylamine (NDMA): a low-molecular-weight nitrosamine and probable human carcinogen frequently monitored as a contaminant.

Gas chromatography–tandem mass spectrometry (GC-MS/MS): an analytical technique combining separation by gas chromatography with selective fragmentation and detection by mass spectrometry to quantify trace compounds.

High-performance liquid chromatography (HPLC): a method that separates components in a liquid sample under high pressure before detection, often by ultraviolet or mass spectrometry.

Liquid chromatography–high-resolution mass spectrometry (LC-HRMS): an advanced platform offering precise mass measurement and structural resolution for complex analytes.

Solid-phase extraction (SPE): a sample-preparation technique that isolates target analytes from matrices using sorbent cartridges for improved purity and sensitivity.

References

1. Determination of N-nitrosodimethylamine and N-nitrosomethylethylamine in drug substances and products of sartans, metformin and ranitidine by precipitation and solid phase extraction and gas chromatography–tandem mass spectrometry. Journal of Pharmaceutical and Biomedical Analysis (2020).
2. A Cautionary Tale: Quantitative LC-HRMS Analytical Procedures for the Analysis of N-Nitrosodimethylamine in Metformin. The AAPS Journal (2020).
3. Rapid and efficient high-performance liquid chromatography analysis of N-nitrosodimethylamine impurity in valsartan drug substance and its products. Scientific Reports (2019).