LC-MS laboratory: analytical development for organic impurities

Controlling organic impurities is a major challenge when characterizing a product, monitoring a manufacturing process, comparing batches, or investigating an atypical result. When the compounds under investigation are present at low concentrations, unknown, structurally close to the substance of interest, or present in a complex matrix, an existing method may lack selectivity or sensitivity.

Filab laboratory carries out analytical development using liquid chromatography coupled with mass spectrometry, or LC-MS, to build an analytical strategy suited to the project’s objectives. The approach may cover screening, chromatographic separation, detection, presumptive identification, and quantification of targeted impurities.

LC-MS can be used to study synthetic impurities, reaction by-products, residual intermediates, degradation products, or organic contaminants. It is particularly relevant when the molecules are poorly volatile, polar, or thermally sensitive, and when mass information helps distinguish closely related compounds.

When unidentified impurities are present, the mass and fragmentation data available depending on the instrumentation can guide investigation and characterization. Conclusions remain dependent on the quality of the data obtained, the standards available, and the level of confirmation expected.

The quality of an analysis starts with sample preparation that is compatible with the matrix and analytes. Filab laboratory can study sample dissolution, extraction, dilution, filtration, or purification. Chromatographic conditions are then optimized: column selection, mobile phase, gradient, flow rate, temperature, and analysis time.

The objective is to separate the substance of interest and impurities as much as necessary to limit interference and ensure reliable interpretation of the results.

Filab laboratory establishes an approach proportionate to your needs: one-off analysis, feasibility study, method development, optimization of an existing method, or analytical transfer. Preliminary discussions help clarify the samples available, critical impurities, time constraints, and reporting expectations.

This approach supports the development of a protocol consistent with the purpose of the study and the actual characteristics of your samples.

At Filab laboratory, the development of an LC-MS method begins with an analysis of the requirements: matrix type, substance of interest, known or suspected impurities, expected levels, and the intended use of the results. Sample preparation, chromatographic, and detection parameters are then studied to obtain a method relevant to the compounds concerned.

The work may include assessing selectivity, analytical response, repeatability, sensitivity, and solution stability, depending on the required performance level. For complementary issues involving acidic compounds, discover the services offered by the organic acid analysis laboratory.

The choice between a broad screening approach and a targeted method depends on the analytical question. A screening strategy can be used to identify signals of interest in a matrix; a targeted method is designed to monitor defined compounds and quantify them. Filab laboratory defines the analytical scope, decision criteria, and results reporting format with you.

Ionization conditions and detection parameters are assessed according to the properties of the molecules and the target concentrations. Depending on the need, development may focus on acquiring characteristic ions, monitoring transitions, or using mass data for investigation. When volatile compounds also need to be analyzed, HS-GC-MS analysis at the laboratory can provide a complementary approach.

Results are interpreted in light of the defined scope, with traceability of the analytical conditions used. Filab laboratory can also employ complementary techniques when an investigation requires additional structural or morphological information, including the services offered by the TEM analysis laboratory.

To initiate your project, provide the Filab laboratory with the available information about the matrix, substance of interest, known or suspected impurities, expected concentrations, existing methods, and analytical objective. Specifying the deadline constraints, number of samples, and desired performance level helps us prepare a suitable analytical proposal.

Contact the Filab laboratory to discuss your requirements, define an LC-MS strategy, and receive a study proposal.