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Research Peptides
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What 99% pure doesn't tell you.
Purity testing measures one thing. We test for the four things it can’t see.
Every peptide supplier publishes a purity number. But HPLC and mass spectrometry — the tests behind that number — were never designed to detect contamination. They measure the molecule, not what’s around it. A peptide can test 99.9% pure and still contain bacterial endotoxins, heavy metals, or microbial growth. The chromatogram won’t show it. Most suppliers won’t test for it. We do.
Toxic fragments left behind by dead bacteria.
Heat-stable. Survive sterilization. Biologically active on their own.
Why purity testing misses them
HPLC and mass spec measure chemistry. Endotoxins are biological remnants — invisible to both. A vial can be 99% pure and still loaded with them.
Why it matters
Endotoxins are biologically active. They trigger immune responses, inflammation, and cytokine release on their own — corrupting research data before the experiment begins.
Toxic fragments left behind by dead bacteria.
Heat-stable. Survive sterilization. Biologically active on their own.
Why purity testing misses them
HPLC and mass spec measure chemistry. Endotoxins are biological remnants — invisible to both. A vial can be 99% pure and still loaded with them.
Why it matters
Endotoxins are biologically active. They trigger immune responses, inflammation, and cytokine release on their own — corrupting research data before the experiment begins.
Lead, arsenic, mercury, and cadmium introduced during synthesis.
norganic. Invisible to HPLC and mass spec. Detected only by ICP-MS.
Why purity testing misses them
Heavy metals are inorganic. HPLC and mass spec are blind to them entirely. They require a separate test (ICP-MS) most suppliers skip.
Why it matters
Heavy metals accumulate in biological tissue and produce confounding effects in long-term studies. We screen for all four primary contaminants on every batch.
Verification that every batch matches the last.
Multi-sample. Reference-tested. Reproducibility, audited.
Why most suppliers miss it
Spot-checking one vial per run is industry standard. We pull multiple samples per batch and test against the same reference every time.
Why it matters
Reproducibility is the foundation of legitimate research. If batches drift, your data drifts with them.
Purity is the floor. Not the ceiling.
American-Owned · Built on Data
Synthesized, tested &
shipped in the U.S.A.
American Peptides is built on documented quality control produced
domestically, tested before release, and fulfilled same-day from our own
facility. When you order, you get the analytical paperwork to match.
Research Peptides
$80.00
Lab Supplies
$6.99
Research Peptides
$60.00
Research Peptides
$82.00
Research Bundles
$170.00
Research Peptides
$60.00
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