Maple When purchasing research peptides, one document matters more than any marketing claim: the Certificate of Analysis (COA). A COA is an independent, third-party verification of what is actually in the vial you receive. For researchers who depend on accurate compound identity and purity, understanding how to read and evaluate a COA is a fundamental skill.
What Is a Certificate of Analysis?
A Certificate of Analysis is a document issued by a testing laboratory that reports the results of quality control testing performed on a specific batch of a chemical compound. For peptides, a COA typically includes HPLC purity analysis, mass spectrometry identity confirmation, and batch identification.
Why COAs Matter for Peptide Research
Peptide purity directly affects experimental outcomes. A compound listed as 95% pure contains 5% of something else. That 5% could be synthesis byproducts, truncated sequences, oxidized variants, or residual solvents. In sensitive research applications, these impurities can confound results.
How to Read a Peptide COA
HPLC Purity Testing
High-Performance Liquid Chromatography separates the components of a sample and quantifies the target peptide as a percentage of total material. A purity reading of 99.2% means that 99.2% of the detected material is the target peptide sequence.
Mass Spectrometry
Mass spectrometry confirms molecular identity by measuring the molecular weight. The observed mass should match the theoretical molecular weight within instrument tolerance.
Batch Number
Every legitimate COA is tied to a specific production batch. The batch number on the COA should match the batch number on your product label.
Red Flags in COA Documentation
No batch number. No testing lab identified. Purity stated without methodology. Generic COAs reused across batches. Missing molecular weight confirmation.
How Maple Research Labs Handles COA Verification
At Maple Research Labs, every batch is tested by Janoshik Analytical, an independent third-party laboratory. Each COA includes a unique verification key that you can check directly on janoshik.com. Our compounds consistently test above 98% purity, with many batches exceeding 99%.
Disclaimer: All peptides offered by Maple Research Labs are strictly for research purposes only. Not intended for human consumption. Researchers are responsible for compliance with all applicable regulations.