Every LifeTein peptide ships with a paper trail you can check for yourself: a certificate of analysis, the HPLC chromatogram behind the purity figure, and the mass spectrum behind the identity. This page explains what each document contains, what it does and does not prove, how long we keep samples and records, and how to raise a question if a result does not look right.
| Field | What it tells you |
|---|---|
| Catalog or order number | Links the vial to your order and to our internal batch record. |
| Peptide name | The name used on your order. |
| Sequence and modifications | The full sequence as made, including terminal groups, labels and other modifications. Check this first against what you ordered. |
| Quantity and vial split | Amount supplied and how it was divided between vials. |
| HPLC purity | The purity measured on the HPLC report for this lot. |
| Molecular formula and molecular weight | The values calculated for the sequence and modifications as ordered, for comparison with the MS report. |
| Release signature and date | Shows that the lot was reviewed and released by our laboratory. |
| Warranty terms | The conditions of our product warranty, including the notice period for any claim. |
The HPLC report shows the chromatogram of the lot and the peak table used to calculate purity. Purity is the share of the detected signal that belongs to the main peak. It tells you how much of the peptide material in the vial is the target sequence compared with closely related by-products such as deletion or truncated sequences.
HPLC purity is not the same as peptide content. A lyophilized peptide also contains counter-ions and residual water, which do not appear in the purity figure. If your work depends on knowing exactly how much peptide is in a solution, read What is net peptide content? and consider adding a content measurement to your order. For help choosing a purity level, see How to choose peptide purity.
The MS report confirms identity: the observed mass should match the molecular weight on the certificate, within the accuracy of the method. A correct mass confirms that the expected composition is present, including any modification that changes the mass.
Mass alone cannot tell apart peptides with exactly the same composition, such as a sequence with two residues swapped, or a peptide with an L- to D-amino acid change. Where that distinction matters for your study, ask us before ordering about additional analysis.
Reading the two reports together
The HPLC report tells you how pure the material is; the MS report tells you what the main component is. You need both. A single clean peak with the wrong mass, or the right mass with a crowded chromatogram, would each be a reason to contact us.
LifeTein works to an ISO-based quality manual covering document control, training, equipment, production records, release and the handling of customer feedback. Peptides are made and released for research use. LifeTein does not manufacture under GMP and makes no GMP claim for its products.
| Item | Kept for |
|---|---|
| Retained peptide sample from the lot | 3 months |
| Batch record | 2 years |
The retained sample lets us re-test the same material if you see an unexpected result, so the sooner you contact us, the more we can check.
Every peptide ships with a certificate of analysis, an HPLC report and a mass spectrometry report for the lot.
No. HPLC purity is the share of the detected signal in the main peak. The vial also contains counter-ions and water, so net peptide content is lower than the gross weight. A separate content measurement is needed if exact amounts matter.
Retained peptide samples are kept for 3 months and batch records for 2 years.
No. LifeTein works to an ISO-based quality manual and supplies peptides for research use only. It makes no GMP claim for its products.
Research use only. LifeTein peptides and proteins are supplied for laboratory research use. They are not for human or veterinary use, and not for diagnostic or therapeutic use. See our research use policy.