Research Peptide Glossary
The terminology that appears on COAs, product pages and protocols.
By PX1 Research Team · August 4, 2026
Research Peptide Glossary
Analytical terms
HPLC — reversed-phase chromatography used to quantify purity. LC-MS — liquid chromatography-mass spectrometry, used for identity. MALDI-TOF — alternate mass-identity method. Karl Fischer — moisture titration. EU/mg — endotoxin units per milligram.
Formulation terms
Lyophilized — freeze-dried. Reconstitution — dissolving lyophilized material in diluent. Bacteriostatic water — sterile water with 0.9% benzyl alcohol. Aliquot — a divided portion stored separately.
Pharmacology terms
Agonist — binds and activates a receptor. Analog — a structurally modified version of a parent molecule. Half-life — time for concentration to fall by half. Secretagogue — a compound that triggers release of another substance.
How PX1 documents every lot
Every PX1 lot ships with HPLC purity, LC-MS identity, residual solvent, moisture (Karl Fischer), sterility and endotoxin data. Lot documentation is published at /purity-reports, /endotoxin-reports and /coa. Manufacturing, purification, lyophilization and vial fill happen in U.S. facilities — see /manufacturing-process.
Research use only. PX1 Research supplies compounds for laboratory and in-vitro research. Nothing here is medical advice, a dosing recommendation, or an offer for human or veterinary use. Figures cited are reported from published laboratory literature.
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PX1 Research Team
PX1 Research is a primary US cGMP-compliant peptide manufacturer. Our team handles solid-phase synthesis, HPLC purification, lyophilization and in-house analytical testing — every batch ships with a lot-specific Certificate of Analysis.
See how we manufacture