Active substance - Glossary - peptidetesting.cc

An active substance is the core chemical molecule, such as a specific peptide sequence, intended to provide pharmacological activity in diagnosing, treating, or preventing disease. Laboratory evaluation of an active substance looks beyond a single purity number, assessing distinct parameters like identity, purity, and content to ensure a complete analytical result.

Laboratory parameters for an active substance

Identity confirms that the tested material is the correct molecule.
Purity compares the target molecule with impurities.
Content or assay quantifies the absolute amount present.

Interpretation risks in lab reports and CoAs

When reading a lab report or Certificate of Analysis (CoA), the primary risk is that results depend on the analytical method used, such as HPLC or quantitative NMR. A single purity percentage does not capture the full picture. A credible report names the specific methods applied and identifies individual impurities. Structural properties like aggregation states also matter, as changes can affect biological activity.

A frequent confusion is the difference between an active substance and a drug product. The active substance is the core molecule, while a drug product is the finished formulation containing the active substance mixed with inactive ingredients. Purity, the proportion of the target molecule, is distinct from content or assay, which quantifies the absolute amount present. Substances sold as unregulated research chemicals are not automatically verified against pharmaceutical standards unless the seller provides a compliant CoA from an accredited lab.

Laboratory parameters for an active substance

Interpretation risks in lab reports and CoAs

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