Editorial Review
Author: Dr. Elena Vasquez, Ph.D.(Ph.D. Biochemistry · Lead Science Editor)|Reviewed by: Scientific Compliance Reviewer
Last reviewed: April 2026
Identity and purity as anchors
Most research peptide COAs lead with identity (e.g., mass spectrometry or equivalent) and quantitative purity (often HPLC area percent). These two anchors are the default acceptance criteria in many in-house SOPs. For technique background, the HPLC glossary entry and mass spectrometry entry are helpful quick references.
Additional quality attributes that may be reported include moisture/water, residual solvents, trifluoroacetic acid (TFA) or counter-ion content, and endotoxins if the test method was used. A dedicated discussion of endotoxin and LAL appears in endotoxin and LAL testing on COAs.
Important Disclaimer — For Research Use Only
The information provided is for educational and research purposes only. All peptides discussed or linked on this site are intended strictly for laboratory and scientific research use only (RUO) and are not for human consumption, injection, ingestion, or any therapeutic application. These products have not been evaluated or approved by the FDA or any regulatory body and are not intended to diagnose, treat, cure, or prevent any disease or condition. Reliance on this content is at your own risk. Consult qualified professionals for any health-related decisions. PurePep Vital disclaims all liability for misuse. Products are offered by third-party retailers for research use only.
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Frequently Asked Questions
“Sufficient” is protocol-specific. A method might require a minimum purity, orthogonal identity, or absence of a particular impurity. The COA should be checked against the protocol’s pre-defined acceptance window.