Identity lines
Product name, sequence and molecular formula should agree with each other. The calculated molecular weight should be consistent with the sequence, and the observed mass from mass spectrometry should agree with the calculated one within tolerance.
Where observed and calculated masses differ, the size of the difference is diagnostic rather than merely a discrepancy.
Purity lines
Read the method alongside the number. Column, gradient and detection wavelength shape the figure, and a purity percentage quoted without them cannot be compared with another.
Content lines
Net peptide content, where stated, answers a different question from purity: how much of the powder is peptide. If it is absent, the vial mass cannot safely be assumed to be all peptide.
Batch and dates
The batch number should match the vial and the box. Manufacture and expiry dates describe material stored as specified. Storage conditions on the certificate are the conditions those dates assume.
Questions worth asking
- Does the batch number match the vial in front of me?
- Is the analytical method stated, not just the result?
- Is net peptide content given, or only purity?
- Do the calculated and observed masses agree?
- Are the storage conditions ones I can actually maintain?
Research use only. This page is explanatory and does not recommend any use, quantity or procedure. REVIVE LAB supplies reference materials for laboratory research. These are not medicines and are not for human or veterinary consumption. Anyone considering the use of any compound in humans should do so only under qualified medical supervision.