Pinealon Testing & Verification
Independent verification of your Pinealon (Glu-Asp-Arg) sample by RP-HPLC-UV. Short, highly polar peptides are the hardest chromatographic class there is, and we are direct about what the method can and cannot establish for one.
What Pinealon is
Pinealon is a synthetic tripeptide with the sequence Glu-Asp-Arg (often written EDR), one of the very short 'bioregulator' peptides of the Khavinson family that also includes Epithalon (Ala-Glu-Asp-Gly) and related two- to four-residue sequences. It is unmodified: no disulfide, no acylation, no metal complex, just three residues. Chemically it is about as polar as a peptide gets — two acidic side chains from glutamate and aspartate plus a strongly basic arginine, on a chain too short to develop meaningful hydrophobic character. It carries no tryptophan, tyrosine, or phenylalanine, so it has no ultraviolet chromophore beyond the peptide bond itself. It is supplied as a lyophilized powder, usually at small labeled masses, and is sold on the research market with no regulated identity or content guarantee.
Why get your Pinealon independently tested
- Hardest chromatographic class there is: a three-residue peptide with two acidic side chains and an arginine is barely retained on a conventional C18 column and elutes at or near the void volume — the same region where salts, counterions, and bulking agents come off. Run on a general-purpose gradient, the analyte and the matrix arrive together, and any purity figure produced from that chromatogram is close to meaningless. Pinealon requires a polar-retentive method that pulls the tripeptide away from the void before area percent or assay can be trusted.
- No aromatic residues, so identity leans on retention time: with no tryptophan, tyrosine, or phenylalanine, there is no distinctive UV band to fingerprint. Detection is at 214 nm on the peptide bond and the diode-array spectrum is essentially featureless. We state this plainly: the identity call for Pinealon is co-elution with a certified Glu-Asp-Arg reference standard under the same polar-optimized conditions, with the UV spectrum offering only weak corroboration. It is real evidence, but it is not a mass-spectrometry sequence confirmation.
- Tiny labeled masses make the salt and water gap proportionally large: Pinealon vials are often labeled in the single-digit milligrams. A tripeptide this ionic carries substantial counterion mass — acetate or TFA paired to the arginine, sodium or similar to the two acid groups — plus residual moisture in a hygroscopic lyophilizate. On a 5 mg label, that non-peptide fraction is a large share of the total, so the difference between powder weight and net peptide is proportionally much bigger than it would be on a 50 mg vial. The net-peptide assay reports peptide milligrams specifically.
- Substitution among look-alike short bioregulators: Epithalon, Pinealon, and the other short Khavinson-type peptides are all white lyophilized powders sold by the same vendors, all in small vials, and all behaving similarly under casual handling. Nothing about appearance distinguishes them, and free amino acids or plain excipient can pass equally well by eye. Comparison against a certified reference standard is the only way to establish that the vial holds Glu-Asp-Arg rather than a neighboring sequence or filler.
What we measure on Pinealon
Each Pinealon sample is analyzed by reversed-phase HPLC with UV/diode-array detection at 214 nm, using a polar-retentive gradient chosen so that a three-residue peptide is actually retained rather than eluting with the solvent front, and compared against a certified Glu-Asp-Arg reference standard. The certificate reports exactly three results: identity, by retention-time match to that standard under identical conditions, with UV-spectral comparison as supporting evidence only (Pinealon has no aromatic chromophore, so we treat retention time as the primary evidence and say so); chromatographic purity, as area percent of the main peak relative to total integrated peak area; and net-peptide assay, as milligrams of peptide per vial.
Every result is issued as a certificate of analysis you — or anyone you forward it to — can verify cryptographically. Reporting identity, purity, and milligram content is the point: a vial can be pure and still underfilled, so we report all three. More on purity vs. net-peptide content and how to read a peptide COA.
Our scope — stated plainly
Testing is RP-HPLC-UV against a certified reference standard. We do not perform mass spectrometry, sterility, endotoxin, heavy-metal, or residual-solvent testing. Because Pinealon is a less-common compound, a certified reference standard may need to be sourced before analysis, which can add lead time; we confirm that before running your sample. KMD Analytical is an independent laboratory and does not sell peptides.
KMD is an independent RP-HPLC-UV lab. We do not run LC-MS / mass-spec, sterility, endotoxin, or heavy-metal testing. If your job needs a capability we don't have, we'll say so.
Pinealon testing — FAQ
Why is a three-residue peptide harder to test than a big one?
Reversed-phase separation works on hydrophobicity, and a tripeptide with two acidic side chains and an arginine has almost none. On a standard C18 gradient it elutes at the void volume together with salts and excipients, so the main peak is not cleanly separated from the sample matrix and neither purity nor assay can be read reliably from that run. The fix is a polar-optimized method that retains the peptide away from the void. Large lipidated peptides, by contrast, retain strongly and separate easily — the small, polar ones are the genuinely difficult end of the method-development problem.
Without aromatic residues or mass spec, how confident is the identity result?
It is a retention-time match against a certified Glu-Asp-Arg reference standard run in the same sequence under the same polar-optimized conditions, and we describe it that way on the certificate. Because there is no tryptophan, tyrosine, or phenylalanine, the UV spectrum is essentially flat and adds little discriminating power. Co-elution with the standard is meaningful evidence, and material with a different retention time is clearly not a match — but it does not confirm the amino-acid sequence, and we do not claim it does. Definitive mass or sequence confirmation requires LC-MS, which is outside our scope.
My vial says 10 mg. How much of that is peptide?
That is exactly what the net-peptide assay answers. The label describes powder, and the powder includes counterion salt, residual water, and any bulking agent alongside the peptide itself. For a highly ionic tripeptide in a small vial, that non-peptide fraction is a proportionally large share of the labeled mass — larger than most buyers expect. We report the measured peptide milligrams so you can compare them against the printed figure.
Can you tell Pinealon from Epithalon?
Yes, provided certified reference standards are available for the comparison. They are different sequences with different retention behavior under a polar-retentive method, so a sample labeled Pinealon that co-elutes with an Epithalon standard rather than a Glu-Asp-Arg standard is flagged on identity. Both are uncommon compounds, so the necessary standards may need to be sourced first.
Other peptides we test
Retatrutide · Cagrilintide · Tesamorelin · BPC-157 · see the full panel.