A due-diligence checklist for sourcing PEP-RTA-3 as a research reagent — certificate, lot linkage, content versus label, vial size arithmetic, and what price differences usually encode.
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Reta, reta/cagri, RETA10-0803. What the abbreviations on a PEP-RTA-3 label and lot code actually encode, and which parts are vendor shorthand rather than chemistry.
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C221H342N46O68 and 4731.2 g/mol. What a mass spectrum confirms about PEP-RTA-3 identity, what the charge-state envelope means, and what identity testing cannot rule out.
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Purity, content and retention time across eleven published PEP-RTA-3 lots. Every lot overfilled, purity between 99.70% and 99.9%, and retention time tracking the batch rather than the material.
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A PEP-RTA-3 COA field by field — identity, content, purity, endotoxin, heavy metals and retention time — read against a real published lot.
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TB-500 is named for a seven-residue fragment, but the mass on most certificates is full-length thymosin beta-4. How to tell which one is in the vial.
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KLOW reports four molecular weights. Two of them - 342.4 and 403.2 - are KPV and GHK-Cu, and confusing them is the easiest mistake to make.
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A GLOW certificate reports three masses - 403.2, 1419.5 and 4964.2. Each identifies one component, and the first one proves the copper is still attached.
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BPC-157 is a 15-residue synthetic peptide derived from a gastric protein. What the sequence is, what the certificate measures, and what the evidence covers.
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A two-component blend certificate reports two masses and two contents. How to check they match the individual compounds, and what blending does not change.
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Sermorelin is the first 29 residues of a 44-residue hormone. Why that truncation retains activity, why the half-life is minutes, and what the certificate shows.
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PEP-TZP-2 is a 39-residue GIP analogue that also activates the GLP-1 receptor. Why the backbone choice matters and what biased agonism means on the certificate.
Read the post →The blog covers buying, handling and research-design questions as they come up. The evergreen material lives in the guides: reading a certificate of analysis, storage and stability, one research guide per compound and the glossary.
New posts publish to the RSS feed. Every post is written for laboratory research use only and links to the lot certificate for any product it mentions.
One email when a new certificate is published, when a sold-out compound is back, or when a new compound is added. About twice a month, nothing else.