Polysaccharide analysis: identifying pollution, purity, and structure

In biopharmaceutical projects, Polysaccharide Analysis is crucial to confirm a product’s identity, understand its level of heterogeneity, and detect any pollution that could affect quality, safety, or performance. Manufacturers regularly face issues such as batch-to-batch variability, the presence of process impurities, crosslinking residues, fragments, differences in molar mass, or variations in chromatographic profiles. These critical points concern in particular hyaluronic acid, complex excipients, injectable biomaterials, and certain formulated matrices based on sugars or polysaccharide derivatives. Insufficient characterization can delay development, complicate a nonconformity investigation, or weaken a quality dossier.

Structural characterization of a polysaccharide is based on studying its composition and molecular organization. The laboratory can determine monosaccharide composition, compare chain lengths, measure molar mass by SEC/GPC, assess viscosity and viscoelastic properties, and establish a differentiated chromatographic profile. Depending on the matrix, additional investigations can also identify specific functional groups, chemical modifications, or residues resulting from synthesis and formulation. This approach is particularly useful for hyaluronic acid, injectable gels, biomaterials, and products containing several families of organic compounds.

Identifying pollution in a polysaccharide requires a targeted or screening strategy depending on the level of information available. The laboratory can search for and identify trace organic impurities, residual solvents, additives, synthesis by-products, degradation compounds, or crosslinking residues. In the case of formulated hyaluronic acid, for example, it is possible to quantify BDDE, look for traces such as DMAPA, DMA, adenine, thymidine, nitrosamines, or highlight specific contaminants by LC-HRMS after appropriate sample preparation. This approach is essential in the event of a nonconformity, a stability study, supplier qualification, or formulation reverse engineering.

Assessing the purity of a polysaccharide is not limited to a global assay. It involves analyzing molecular heterogeneity, quantifying aggregates, observing possible fragments, comparing chromatographic profiles, and measuring useful physicochemical properties such as solubility, solution stability, thermal stability, or viscosity. Depending on the product, charge variant analysis and chemical modification studies provide additional information on material integrity. This overall view makes it possible to determine batch compliance, document a supplier change, objectify a process drift, or strengthen an analytical development program.

Our laboratory supports biopharmaceutical manufacturers and subcontractors in assessing the purity, structure, and associated contaminants of polysaccharides. The analytical approach is built around your needs: compliance testing, batch comparison, de-formulation, unknown impurity identification, method development, analytical transfer, or stability study. We combine separation, spectrometric, and physicochemical techniques to obtain an actionable reading of the product: monosaccharide composition, molar mass, viscosity, homogeneity, presence of aggregates, charge profiles, trace-level organic impurities, and residual compounds. For regulated environments, this approach can be carried out within a GMP Analysis framework.

The analytical methods available include size exclusion chromatography (SEC/GPC) for molar mass distribution and aggregate quantification, IEX-UV for charge variant studies, HPLC-HRMS/MS for the identification and quantification of impurities or chemical modifications, as well as approaches for the search for volatile, semi-volatile, and non-volatile compounds. For certain advanced surface characterization or material investigation issues, complementary techniques such as Fib Tof Sims analysis may be considered. The instrumental environment of Laboratoire analysis Met can also support additional characterization needs depending on the sample type.

Among the cases handled are setting up a method for quantifying hyaluronic acid in a gel, identifying an unknown impurity by LC-HRMS, comparing a compliant batch with a noncompliant batch, or de-formulating a complex product. When the need extends to associated biomolecules, a complementary reading can be combined with our expertise in Biopharmaceutical Peptide Identification. The goal remains the same: assign the origin of the analytical discrepancy and provide results that can be directly used for industrial decision-making.

Choosing Filab means benefiting from a partner capable of combining analytical expertise, an understanding of industrial challenges, and clear reporting of results. The laboratory handles both one-off requests and complete programs: feasibility, method development, validation, impurity investigation, comparative studies, R&D support, and quality control. The results are interpreted in light of your product issue to help you decide quickly: release a batch, investigate a drift, adjust a formulation, document a technical file, or secure a raw material change.

To start a study, simply send us your requirements: type of polysaccharide, matrix, product history, issue encountered, existing specifications, available sample volume, and expected timeline. The laboratory can then propose a tailored analysis plan: identify the structure, check purity, look for contamination, compare batches, quantify a target compound, develop a method, or carry out a de-formulation. To move forward efficiently: define the analytical objective, provide the useful technical information, have the samples analyzed, interpret the results with our experts, secure your quality and development decisions.