Two methods, different questions
A purity question and an identity question are related, but they are not interchangeable. HPLC provides information about the separation and relative profile of detected sample components under defined conditions. MS provides mass-related evidence that can help evaluate the expected identity.
A clean-looking chromatogram alone does not establish identity. A mass signal consistent with the expected material alone does not establish its purity. Combined HPLC + MS testing is the recommended starting point when you want both perspectives. The appropriate scope still depends on the sample and your question.
Choose the scope before sending the sample
Tell us the peptide or sample name, how many samples you want analyzed, and which question matters for the order. If you are unsure which method to request, describe the purchasing decision you are trying to inform.
Before delivery, confirm the sample requirement, method suitability, current price, turnaround time, and reporting scope. There is no published fixed price or universal sample quantity on this website.
- HPLC: purity-related information for the submitted sample.
- MS: identity / molecular-weight-related analytical information.
- HPLC + MS: combined purity and identity-focused analysis.
Make the sample traceable to your inquiry
Use distinct sample labels when submitting more than one material. Keep a record connecting your inquiry, supplier reference, and submitted sample. Discuss which identifying information should appear in the English PDF report.
If a supplier sends the sample directly, ask them to follow the confirmed delivery instructions and include the agreed sample reference. Avoid arranging an unannounced delivery before the testing scope has been accepted.
Read the report as sample-specific evidence
The report describes the material received and tested. It adds analytical information to your supplier documentation; it does not decide whether you should buy, pay a balance, or authorize shipment.
A submitted sample may differ from other units in a batch. Testing cannot guarantee a later shipment, and the scope should not be interpreted as a certification of every characteristic. Keep those boundaries explicit when discussing the findings with your supplier.