Peptide Testing Glossary
Definitions for 29+ terms used in peptide analysis, quality testing, and laboratory science
Last updated: February 2026
Definitions for 29+ terms used in peptide analysis, quality testing, and laboratory science
Last updated: February 2026
Stability studies at elevated temperature/humidity to predict shelf life within 3–6 months.
The count of viable microorganisms on a sample, measured before sterilization.
Body Protection Compound-157, a 15-amino-acid research peptide studied for tissue repair.
An official lab document reporting purity, identity, and quality results for a peptide batch.
Current Good Manufacturing Practice — FDA regulations for pharmaceutical manufacturing.
A graph of detector response over time produced by HPLC analysis.
A degradation pathway where Asn or Gln residues lose an amide group, shifting mass by +1 Da.
A peptide impurity missing one or more amino acids due to a failed coupling step.
A covalent bond between two cysteines that stabilizes peptide 3D structure.
Bacterial contaminants that cause fever and inflammation; tested via the LAL assay.
Electrospray Ionization Mass Spectrometry — a soft ionization method ideal for intact peptides.
Gas Chromatography combined with Mass Spectrometry to detect residual solvents.
Peptides that activate GLP-1 receptors, used in metabolic and weight research (Semaglutide, Tirzepatide, Retatrutide).
A quality system for research labs ensuring data uniformity, reliability, and integrity.
High-Performance Liquid Chromatography — the gold-standard analytical method for measuring peptide purity.
International standards for pharmaceutical method validation, stability, and impurity limits.
Inductively Coupled Plasma Mass Spectrometry — used to detect trace heavy metals at parts-per-billion sensitivity.
Liquid Chromatography combined with tandem Mass Spectrometry for both purity and identity in one run.
Freeze-drying that produces stable peptide powder for shipping and long-term storage.
An analytical method that measures mass-to-charge ratios to confirm peptide identity.
Demonstrating that an analytical method is accurate, precise, and fit for purpose per ICH Q2.
A degradation pathway adding +16 Da, typically affecting methionine, cysteine, or tryptophan.
Self-association of peptide molecules into oligomers or fibrils, reducing bioavailability.
The percentage of target peptide in a sample, measured by HPLC.
Chemical changes to amino acids after synthesis, like phosphorylation or acetylation.
How long a peptide retains specified purity and potency under recommended storage.
The standard method for making synthetic peptides on a resin support.
A reagent used in peptide synthesis and purification; a frequently tested residual contaminant.
A shorter peptide fragment caused by incomplete synthesis or premature cleavage.
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