Quality Standard
HPLC-Verified Peptide Purity at âĨ99%
High-Performance Liquid Chromatography (HPLC) is the gold-standard analytical method for determining peptide purity. Every single batch of research peptides sold by LifeSpanSupply is independently verified by third-party HPLC testing at âĨ99% purity before it enters our inventory. We do not rely on in-house numbers. Every shipment includes a batch-specific Certificate of Analysis with the full HPLC chromatogram, mass-spectrometry identity confirmation, and net-peptide content figures â so the number on the label is the number in the vial.
Why Reverse-Phase HPLC
Reverse-phase HPLC (RP-HPLC) separates peptide components by hydrophobicity as they pass through a column packed with a non-polar stationary phase. A waterâacetonitrile gradient carries the sample, and a UV detector at 214 nm or 220 nm measures absorbance as each species elutes. The resulting chromatogram shows the target peptide as a dominant peak, with any impurities visible as smaller peaks at different retention times. The ratio of the main peak area to the total peak area gives the purity percentage reported on the COA.
What We Look For
A clean research-grade COA should show a flat, stable baseline, one dominant peak for the target peptide, and minor peaks (if any) representing quantified impurities such as deletion sequences, truncated fragments, oxidized methionine or tryptophan residues, or residual protecting groups. Our third-party labs flag and quantify every impurity above 0.1%. Mass-spectrometry data on the same COA confirms the molecular weight matches the target peptide sequence â identity plus purity, not just purity alone.
Why âĨ99% Matters
Below 99%, peptide research loses reproducibility. Impurities can trigger off-target receptor binding, immunogenic responses that confound inflammatory biomarker data, and unpredictable dose-response curves. Quantitative studies, dose-response experiments, structural research (NMR, X-ray crystallography), and any work destined for peer review require âĨ99% purity with full analytical documentation. That is our standard across the entire LifeSpanSupply catalog â no exceptions, no tiers.
Frequently Asked Questions
What purity level do you guarantee?
Every peptide in the LifeSpanSupply catalog is independently HPLC-verified at âĨ99% purity. Every shipment ships with a batch-specific Certificate of Analysis documenting the exact purity percentage for that batch.
Who performs your HPLC testing?
All HPLC testing is performed by independent accredited third-party laboratories â not in-house. This removes any incentive to inflate purity numbers and provides the same independent verification process used in pharmaceutical QC.
Can I verify your COA independently?
Yes. Every COA includes the lot number, testing date, testing laboratory, chromatogram image, and mass-spectrometry data. If you have access to HPLC equipment, running a sample under the documented conditions should reproduce similar retention times and purity figures within Âą1â2%.
What if the COA shows below 99% purity?
A batch that fails our âĨ99% standard is rejected before it enters inventory. You will never receive a vial with a sub-99% COA from LifeSpanSupply.