Peptide Fentanyl Presence Testing: What “Not Detected” Means
Learn how peptide fentanyl presence testing is reported, what “not detected” means and why results remain specific to the tested sample and batch.
Peptide Heavy Metals Testing: Understanding ppm and Laboratory Results
Learn how peptide heavy metals testing measures arsenic, cadmium, lead and mercury, what ppm means and how to review elemental results on a batch-specific COA.
Peptide Endotoxin Testing: What EU/mL and “Pass” Mean
Learn how peptide endotoxin testing works, what EU/mL and pass results mean, and why endotoxin testing differs from sterility testing.
Peptide Sterility Testing: What “No Growth” Means
Learn how peptide sterility testing works, what a no-growth result means, why sterility differs from endotoxin testing and what to verify on a COA.
Peptide Net Content Testing: Labelled vs Measured Amount
Learn how peptide net content testing compares labelled and measured amounts, why purity does not equal milligrams per vial, and what to verify on a COA.
LC-MS Peptide Testing: Understanding Identity Results
Learn how LC-MS peptide testing supports identity assessment, how it differs from HPLC purity and what researchers should verify on a peptide COA.
Peptide Testing Beyond Purity
Peptide testing beyond purity examines separate analytical questions including identity, net content, sterility, endotoxins, elemental impurities and targeted fentanyl-presence screening.
Peptide Purity Testing: What HPLC and Mass Spectrometry Show
Learn how HPLC and mass spectrometry contribute to peptide purity testing—and why purity, identity, net content and expanded screening should be reviewed separately.
How to Read a Peptide Certificate of Analysis
Learn how to review a peptide Certificate of Analysis, including batch matching, identity, purity, net content, sterility, endotoxins and independent verification.