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Peptides

PT-141 (Bremelanotide) analysis

Sexual-health peptide, often sold at inflated strength claims.

PT-141 is a cyclic peptide and easy to under-dose. Content and purity are both measured against the label claim.

What this test tells you

Identity — LC-MS

Confirms the molecule is what the label claims, by measuring the mass of the eluting ions. Catches substitution and the wrong compound entirely.

Content — quantitative HPLC

How much is actually in the vial, compared against the declared strength and reported as a percentage of claim.

Purity — HPLC-UV

Area percent of the main peak, with the chromatogram attached so the figure can be checked rather than trusted.

A verifiable report

A report ID and unique key that resolve to a public record. Anything that does not resolve is not a genuine report.

Parameters
Target compoundPT-141 (Bremelanotide)
CAS189691-06-3
Testing methodRP-HPLC-UV 214 nm + ESI-LC-MS
Result formatmg per vial, purity %, identity confirmed
Minimum sample1 whole unopened vial, or 10 mg raw API
Frequently asked questions
Can you test the nasal spray form?

Yes, send the device sealed. Volume-based concentration is reported instead of mg per vial.

Additional services

Add any of these to the same vial, on the same certificate.

Optional add-ons

  • Raw data packageChromatogram and mass spectrum as open files, not just PDF.
    +$18
  • pH measurementMeasured on reconstituted sample, reported to 0.01.
    +$27
  • Fentanyl presence screenTargeted LC-MS screen. Reported present / not detected.
    +$55
  • Variance testingTwo independent injections from the same vial, reported separately.
    +$55
  • Additional report copyA second certificate issued under a different origin label.
    +$37
  • Heavy metals (ICP-MS)As, Cd, Pb, Hg. Reported per element, <0.01 ppm.
    +$125
  • Endotoxin (LAL)Kinetic LAL, reported in EU/mg. Requires a second vial of the same compound.
    +$210
  • CHNS mass reportElemental composition, independent of the HPLC assay.
    +$105
  • LC-MS contamination screenScreens for unrelated peptides and small molecules.
    +$150
  • Sterility (TAMC + TYMC)Compendial sterility. 14-day incubation. Requires a second vial.
    +$179
  • TFA content analysisResidual trifluoroacetic acid, reported as % w/w.
    +$210

Not sure this is the right test?

Describe the sample and we will tell you what to order — or whether we can test it at all.

Ask us