HPLC and mass spectrometry explained for peptide buyers

Two instruments, two questions: how pure is it, and is it the right molecule?

HPLC answers: how pure?

High-performance liquid chromatography separates components and reports the main peak as a share of all detected material. It tells you about purity.

Mass spec answers: which molecule?

Mass spectrometry measures molecular weight. If the observed mass matches the theoretical mass of the sequence, identity is supported. It tells you about identity.

Why you want both

A pure sample of the wrong compound is useless, and the right compound at low purity adds variables. MPGA Labs batches carry both tests. Look one up in the COA section.