Getting Started
Research Peptide Terminology
A plain-language glossary of the terms you'll encounter on labels, certificates, and product documentation.
6 min read
Terms you'll see on every label
Sequence — the ordered list of amino acids that defines the peptide. Two peptides with the same amino acids in a different order are different compounds.
Molecular weight — the mass of one molecule of the compound, used in concentration calculations.
Net peptide content — the fraction of the vial's material that is actually the target peptide, after accounting for counter-ions and residual moisture.
Lot / batch number — the identifier tying a vial to a specific production run and its test records.
Analytical terms
HPLC (High-Performance Liquid Chromatography) — the standard method for measuring peptide purity by separating compounds as they pass through a column.
MS (Mass Spectrometry) — a technique that confirms a compound's identity by measuring its molecular mass.
Purity (%) — the proportion of the sample that is the target peptide, typically reported from HPLC analysis.
Handling terms
Lyophilized — freeze-dried into a stable powder for storage and shipping.
Reconstitution — dissolving a lyophilized compound in an appropriate laboratory solvent for analytical work.
Aliquot — a measured portion of a solution, divided to avoid repeated freeze-thaw stress on a stock.
Research Use Only. This page is provided for scientific and educational purposes only. It is not medical advice, does not describe any approved therapy, and provides no dosing, administration, or treatment instructions for human use. SFVLAB products are not intended to diagnose, treat, cure, or prevent any disease and are not for human or veterinary use.
More in Getting Started
Elsewhere in the Learning Center
- How to Understand a Certificate of Analysis — Purity & Testing
- What Peptide Purity Actually Means — Purity & Testing
- Understanding HPLC Testing — Purity & Testing