Mass Spectrometry
Mass spectrometry is a lab method that weighs molecules with extreme precision. Because every compound has a known mass, the measurement lets an analyst confirm that a sample really is the compound it is supposed to be.
Where the word comes from
Mass traces to the Latin massa, “a lump or dough,” itself from the Greek maza. Spectrometry joins the Latin spectrum, “image or appearance,” with the Greek metron, “measure” — so the whole word means “measuring the picture of masses.” The first instruments that sorted charged atoms by mass were built in physics labs in the 1910s and 1920s. Chemists later adapted the method to weigh whole molecules, which is how it is used on peptides today.
What it means here
The instrument gives molecules an electric charge, then sorts them by mass. The measured mass is compared with the expected molecular weight of the named compound; a match confirms identity. Labs often pair mass spectrometry with HPLC — one separates the mixture, the other identifies what came out. The same pairing is the standard method in published work for detecting peptides in complex samples, which is why it appears throughout the analytical literature this catalog cites. On a Certificate of Analysis, the mass spectrometry line is the identity check.
Words you’ll see together
- m/z — mass divided by charge; the number the instrument actually reads
- LC-MS — liquid chromatography plus mass spectrometry run as one system
- MS/MS — tandem mass spectrometry; the molecule is broken up and the pieces weighed too
- spectrum — the chart of masses one run produces
- observed mass — the measured value compared against the expected molecular weight
Related terms
- HPLC — the separation step usually run alongside it
- Molecular weight — the expected mass the measurement is checked against
- Purity — the companion measurement; identity and purity together describe a batch
Where it appears in our catalog
- Purity and testing FAQ — where identity testing fits in our batch process
- CJC-1295 (DAC) — its compound class is a frequent subject of published mass-spectrometry detection methods
- Sermorelin — another GHRH-class peptide covered by that analytical literature
References
- Thomas A (2024). Chromatographic-MS analysis of peptidic analytes (2-10 kDa) in doping control urine samples. J Mass Spectrom. PMID 38197510 · DOI 10.1002/jms.4996
- Cristea CD (2023). Cationic exchange SPE + triple-quadrupole UHPLC-MS/MS for detection of GHRHs in urine samples. Anal Biochem. PMID 37806509 · DOI 10.1016/j.ab.2023.115336
