Source comparison
Tesamorelin COA: Testing Method Comparison
HPLC (High-Performance Liquid Chromatography) Purity. Percentage of target peptide vs impurities ≥98.0% purity Deletion sequences and truncated chains reduce biological activity even at 95% purity Non-negotiable. Reject any batch <98% Mass Spectrometry Molecul
This comparison does not assign a generated winner or score.
- HPLC (High-Performance Liquid Chromatography)
- Purity. Percentage of target peptide vs impurities
- ≥98.0% purity
- Deletion sequences and truncated chains reduce biological activity even at 95% purity
- Non-negotiable. Reject any batch <98%
- Mass Spectrometry
- Molecular weight confirmation
- 5135.9 g/mol ±0.5% (5110–5161 g/mol range)
- Only method that verifies correct amino acid sequence
- Required. 'molecular weight confirmed' without spectrum is insufficient
- Endotoxin Testing (LAL)
- Bacterial endotoxin contamination
- <1.0 EU/mg
- Endotoxin triggers immune response and invalidates research results
- Mandatory for injectable-grade peptides
- Sterility Testing
- Bacterial and fungal contamination
- No growth detected
- Contaminated peptides degrade rapidly and pose safety risk
- Required if reconstituting for injection