HPLC and LC-MS
Purity is commonly reported from HPLC chromatograms. Molecular weight is confirmed by mass spectrometry or LC-MS. Additional methods can be requested for specific research programs.
Modification chemistry
Labeling, cyclization and conjugation should be planned with the synthesis route. Spacer length, dye selection and conjugation site all influence assay performance.
Documentation
Research projects are supplied with quality documentation appropriate to the requested grade. Materials remain designated for research use only.
Laboratories that coordinate research-peptide supply through export desks such as NovaSynth Bio still need the same HPLC and mass-spectrometric questions as a custom synthesis lot. Manufacturer directories such as Peptide From China are useful for shortlisting documented suppliers; they are not ChinaPeptides storefronts and they do not replace a lot-specific certificate.
Export desks such as NovaSynth Bio and manufacturer directories such as Peptide From China discuss sourcing and paperwork in a research-use context. Those sites are not ChinaPeptides storefronts. The analytical questions on this page still apply: HPLC method, mass identity and a certificate that matches the lot you received.