Methods used to confirm identity, purity and lot consistency of Semax reference material.
Appearance
A Semax reference lot is typically a white to off-white lyophilized solid. Routine checks include inspecting appearance and confirming clean reconstitution in an appropriate analytical solvent so the sample is fit for chromatographic and spectrometric measurement.
RP-HPLC purity
Reverse-phase HPLC provides the purity figure, generally not less than 98%. A gradient with an ion-pairing additive resolves the main peak from related impurities, and the integrated chromatogram supports the value recorded on the certificate of analysis.
Mass-spectrometric identity
Identity is confirmed by mass spectrometry, matching the observed mass against the value near 813.9 g/mol expected for the heptapeptide. The technique can also flag common impurities such as oxidation or deletion sequences encountered in peptide synthesis.
Lot control
Each lot is documented with analytical results so researchers can confirm batch-to-batch consistency. Keeping this documentation with experimental records supports traceability and reproducibility for neuropeptide benchwork using the standard.