The per-batch document reporting what a compound was tested for, by which method, and what the results were.
A certificate of analysis is batch-specific. It states the identity and purity determined for one particular lot, the analytical methods used to determine them, and the date of testing.
Two certificates for the same compound from different batches are different documents, and a certificate that does not name the batch it belongs to cannot be checked against the vial in front of you. Echo Peptides publishes the certificates on file on the lab results page.
Topic: Lab Practice
A foundational overview of what research peptides are, how laboratories handle them as reference compounds, the difference between in-vitro and preclinical models, and why COAs matter.
Read moreMelanotan II is a cyclic lactam analog of alpha-MSH designed in 1989 to lock a flexible hormone fragment into one conformation. It binds four of the five melanocortin receptors, which makes it a powerful reference ligand and a poor subtype probe. What has been measured, in which systems, and where the record stops.
Read moreGlutathione is not a signaling peptide — it is the most abundant low-molecular-weight thiol cells synthesize. A guide to its biosynthesis, the three enzyme families that require it, the Nernst arithmetic behind GSH/GSSG, and what the literature still does not know.
Read moreA stereochemically inverted residue produces a diastereomer with the identical molecular formula and the identical mass as the target. This guide covers the oxazolone and direct-enolization mechanisms that generate them, which residues and coupling conditions are worst, and how D-isomers are detected.
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