Question 1

How do I verify a peptide Certificate of Analysis?

Accepted Answer

Check that the COA references the exact lot number printed on your vial, names the independent testing laboratory, and reports both HPLC purity (≥99%) and a mass-spectrometry identity match against the calculated molecular weight.

Question 2

What does HPLC purity testing measure?

Accepted Answer

HPLC separates the components of a peptide sample and quantifies each peak. The purity percentage on a COA is the area of the target-peptide peak as a fraction of all detected peaks.

Question 3

What is mass spectrometry identity confirmation?

Accepted Answer

Mass spectrometry measures the molecular weight of the peptide in the vial. Identity is confirmed when the observed mass matches the theoretical molecular weight calculated from the peptide's amino-acid sequence.

Question 4

How are research peptides shipped and stored?

Accepted Answer

Lyophilized peptides ship in sealed glass vials with temperature-controlled domestic delivery in 2–4 business days. Unopened lyophilized vials are stored refrigerated (2–8 °C) or frozen (−20 °C) for long-term storage.

Question 5

What does 'research use only' mean?

Accepted Answer

'For in-vitro laboratory research use only' means the compound is sold strictly for non-clinical scientific study in laboratory environments. It is not a drug and is not intended for human or animal consumption.