Understanding COA Components
A Certificate of Analysis (COA) is your primary tool for verifying peptide quality. Every legitimate research peptide should come with a detailed COA from the vendor.
Key COA Elements to Check
Purity Percentage: Look for HPLC purity above 98% for research-grade peptides. Lower purity indicates impurities that could affect research outcomes.
Mass Spectrometry Results: Verify the molecular weight matches the expected peptide structure. Even small deviations can indicate incorrect synthesis or degradation.
Water Content: Peptides should typically contain 5-12% water by weight. Excessive water content reduces actual peptide concentration.
Batch Information: Ensure the batch number on your vial matches the COA. Mismatched batches are a major red flag.
Red Flags in COAs
Be cautious of generic COAs lacking specific batch information, unusually perfect results (exactly 100% purity), or COAs dated significantly before your purchase.
Verification Steps
Always request COAs before purchase and verify they're from accredited laboratories. Legitimate vendors provide batch-specific testing rather than generic certificates.
Remember, this information is for research purposes only and not medical advice. Proper COA interpretation is essential for maintaining research integrity and reproducible results.