Source comparison
CJC-1295 COA Data: Quality Benchmarks Comparison
HPLC Purity ≥98.0% by peak area <95% or purity stated without method Below 98% indicates incomplete purification or degradation; lack of method transparency suggests unreliable testing HPLC Chromatogram Single dominant peak, sharp and symmetrical, baseline fla
This comparison does not assign a generated winner or score.
- HPLC Purity
- ≥98.0% by peak area
- <95% or purity stated without method
- Below 98% indicates incomplete purification or degradation; lack of method transparency suggests unreliable testing
- HPLC Chromatogram
- Single dominant peak, sharp and symmetrical, baseline flat
- Multiple peaks >1% area, broad or split main peak, baseline drift
- Multiple peaks = synthesis impurities; peak broadening = heterogeneity or degradation; baseline issues = column or solvent contamination
- Molecular Weight (MS)
- 3367.9 Da ±0.5 Da
- >1 Da deviation or molecular weight not reported
- >0.5 Da deviation suggests wrong peptide, incomplete synthesis, or unwanted modification; absence of MS data means identity isn't confirmed
- Test Date vs Order Date
- COA dated within 30 days of order
- COA dated >90 days before order or no date listed
- Peptides degrade over time even in lyophilised form; old COAs may not reflect current batch quality
- Batch Number Consistency
- Batch number on COA matches vial label
- Batch mismatch or generic COA with no batch number
- Mismatch means the COA doesn't correspond to your material; generic COAs are often recycled across multiple batches
- Professional Assessment
- Full data transparency with raw chromatogram and mass spectrum published
- Summary data only, no raw analytical output provided
- Summary-only COAs allow selective reporting; raw data enables independent verification and reveals quality nuances the summary hides