Understand the source comparison
Verify VIP Purity: Peptide Standards Comparison
HPLC Analysis Molecular purity. Percentage of sample that is the target peptide vs impurities ≥95% for research-grade peptides; ≥98% for critical applications Impurities reduce effective dose and introduce variables that distort dose-response curves HPLC is th
No winner is assigned.
This page preserves a source comparison for education. It does not add a rating, recommendation or clinical judgment.
- HPLC Analysis
- Molecular purity. Percentage of sample that is the target peptide vs impurities
- ≥95% for research-grade peptides; ≥98% for critical applications
- Impurities reduce effective dose and introduce variables that distort dose-response curves
- HPLC is the foundational test. Without it, you're trusting supplier claims without evidence
- Mass Spectrometry
- Exact amino-acid sequence and molecular weight
- Measured weight must match theoretical weight within ±2 daltons
- Wrong sequence = wrong peptide, even if purity is high; sequence errors invalidate all downstream assays
- MS confirms you received what you ordered. HPLC alone cannot detect sequence substitutions
- Sterile Filtration + LAL
- Bacterial contamination and endotoxin levels
- <0.5 EU/mg endotoxin; sterile filtration through 0.22-micron membranes
- Endotoxins trigger immune activation and degrade peptides during storage; contamination compounds over time
- Sterility is as critical as purity for reproducible results. Contaminated peptides fail even with correct sequence
- Certificate Source
- Who performed the analysis
- Independent ISO 17025-accredited lab (not in-house testing)
- In-house testing lacks external oversight; third-party verification removes conflicts of interest
- Only third-party certificates prove verification. In-house data is unverifiable
- Third-party certification is the standard. In-house testing without external lab confirmation is not verification. It's self-reporting.