Total organic carbon (TOC) analysis

Medical device manufacturers need to be able to characterize the presence of organic compounds in rinse water, extracts, solvents, raw materials or cleaning solutions. The TOC analysis measures the overall amount of carbon originating from organic substances, without individually identifying each compound. It therefore provides a useful indicator for monitoring the chemical cleanliness of a process, comparing batches, tracking cleaning effectiveness or investigating analytical drift. This approach can complement a medical device analysis depending on the nature of the product, its intended use and the risks to be assessed.

TOC analysis can be performed on purified water, rinse water, cleaning solutions, solvents compatible with the method, process baths or extracts obtained from a medical device. Sample preparation must limit any external introduction of organic matter that could distort the measurement. When the need concerns metallic elements, an ICP analysis of medical devices provides a complementary response based on elemental characterization.

TOC expresses the total amount of carbon originating from organic substances present in the sample. On its own, it cannot determine the chemical nature of the molecules detected. It is therefore particularly well suited to monitoring trends, comparing a result with an internal threshold or verifying a rinsing step.

Interpreting a TOC result depends on the context in which the sample is used. A value may be compared with a reference level established from representative batches, an internal process limit, a cleaning criterion or a specification defined in your quality documentation. The analytical value alone is not sufficient to conclude on the overall compliance of a medical device without taking these factors into account.

The Filab laboratory supports manufacturers in defining a total organic carbon analysis strategy consistent with the matrix being studied and the control objective. The preliminary assessment takes into account, in particular, the sample type, expected concentrations, sampling method, contamination risks and required sensitivity level. The results establish a measured value under defined conditions and support the comparisons specified in your control plan.

The choice of container, sampled volume, storage conditions and time before analysis affect the representativeness of the measurement. The Filab laboratory works with your teams to define sampling and transport procedures suited to the matrix. This step is particularly important for samples with low organic content, which are more sensitive to accidental contamination.

When an unexpected result is obtained, an additional investigation may be required to characterize the substances involved. The Filab laboratory can guide the analytical strategy based on the industrial context, the matrix and the suspected origin of the residue. For issues related to devices that administer a substance, also discover our injectable device analysis services.

The TOC analysis can be incorporated into process monitoring, cleaning qualification or post-deviation investigation activities. The Filab laboratory tailors its support to your needs: feasibility study, one-off analysis, sample comparison or assistance with interpretation. An industrial process audit can also help examine the parameters likely to influence chemical cleanliness.

To get your project started with the Filab laboratory, describe your setup, specify the matrix to be analyzed, indicate the purpose of the control, and provide the available information about the sample, expected concentrations, and acceptance criteria. Our teams will guide you toward an analytical approach suited to your industrial needs.