Methods used to confirm the identity, purity and lot consistency of TB-500 reference material.
Appearance
A TB-500 reference lot is typically supplied as a white to off-white lyophilized solid. Routine checks include inspecting the appearance and verifying clean reconstitution in an appropriate analytical solvent, ensuring the sample is suitable for chromatographic and spectrometric measurement.
RP-HPLC purity
Reverse-phase HPLC provides the purity figure, generally not less than 98%. For a larger peptide like TB-500, gradient conditions are tuned to resolve the main component from related impurities, and the integrated chromatogram supports the value recorded on the certificate of analysis.
Mass spectrometry
Given the approximate mass near 4963 g/mol, mass spectrometry confirms identity by matching the observed mass against the expected value for the fragment sequence. For peptides of this size, multiply-charged ion series are commonly deconvoluted to arrive at the measured mass.
Lot documentation
Each batch carries analytical results that allow researchers to confirm consistency over time. Keeping this documentation with experimental records supports traceability and reproducibility, which matters when a cytoskeletal tool compound is used across multiple studies.