Testing
Every MMRR product batch is independently third-party tested.
Peptide quality cannot be established by appearance or by a single purity number. MMRR uses independent laboratory testing as part of batch release to evaluate the identity, purity, content and other quality attributes relevant to each peptide and manufacturing process.
Third-party laboratories
Analytical release testing is performed independently rather than relying only on internal manufacturing data or supplier claims.
Testing follows the batch
Testing is tied to the material being released. The applicable panel is selected for the peptide, synthesis route, formulation and known impurity risks.
More than purity
A high chromatographic purity result does not by itself prove identity, peptide content, sterility or low endotoxin. Those are separate quality attributes.
Identity, purity and peptide content
These are the foundation of peptide analytical testing. The exact instrumentation may differ by laboratory and compound, but the analytical objective remains the same: confirm what the material is, characterize the impurity profile and determine how much peptide is actually present.
Mass-spectrometric techniques such as LC-MS may be used to compare the observed molecular mass with the expected peptide. Depending on the molecule, additional orthogonal identity techniques can be used when needed.
RP-HPLC or UPLC separates the principal peptide peak from detectable peptide-related impurities. Integrated peak area is used to characterize chromatographic purity and the impurity profile.
Purity and content are not the same measurement. Assay or quantitative peptide-content testing evaluates how much peptide is present in the sample rather than only the relative area of chromatographic peaks.
For complex peptides, analytical mass data, peptide mapping or other suitable techniques can provide additional evidence that the synthesized material is consistent with the intended sequence and molecular form.
Residuals, moisture and inorganic impurities
Peptide synthesis, purification, lyophilization and packaging can introduce quality attributes that are not visible in an HPLC purity result. the MMRR third-party testing program evaluates applicable process-related risks for each product and batch.
Organic solvents used during synthesis and purification can be evaluated using gas-chromatographic methods such as GC or headspace GC when applicable.
Moisture can influence stability and the actual dry-weight composition of lyophilized material. Water can be measured by an appropriate method such as Karl Fischer analysis where relevant.
Peptides may be isolated as acetate, trifluoroacetate or another salt form. Counter-ion content and relevant synthesis-related residues can be evaluated when they are material to the product specification.
Elemental or heavy-metal screening can be performed by sensitive techniques such as ICP-MS when the manufacturing process, raw materials or product specification make that testing applicable.
Bioburden, endotoxin and sterility are separate tests
Analytical purity does not establish microbiological quality. Where microbiological attributes are relevant to a product or batch, they must be evaluated using dedicated methods rather than inferred from HPLC or mass-spectrometry results.
Microbiological methods can assess viable microbial contamination in a sample or process where that attribute is part of the applicable quality panel.
Endotoxin is not detected by routine peptide-purity testing. Where applicable, a dedicated endotoxin method such as LAL or recombinant-factor testing is required.
Sterility is a distinct microbiological claim and requires a specific sterility test. MMRR does not use a purity result as a substitute for sterility testing and does not describe a batch as sterile unless that attribute has actually been tested.
Appearance, container integrity and other physical observations can complement laboratory testing, but they do not replace analytical identity, purity, content or microbiological testing.
Not every analytical method is appropriate or necessary for every peptide. the MMRR testing program uses the tests applicable to the specific product, batch, manufacturing process and quality risk. Every MMRR product is third-party tested, while the exact analytical panel may differ by peptide and batch. All products remain for research purposes only.