Understanding Your Certificate of Analysis
A guide to reading and interpreting the COA that accompanies every batch we sell.
What Is a Certificate of Analysis?
A Certificate of Analysis (COA) is a document issued by a testing laboratory that reports the results of quality testing performed on a specific batch of material. It serves as an objective, third-party verification that the product meets its stated specifications.
Every batch sold by Instant Peptides has a corresponding COA that you can access through our Batch Lookup Tool.
Key Components of a COA
Identity (Mass Spectrometry)
Confirms that the peptide in the vial is the correct compound. Mass spectrometry measures the molecular weight of the peptide and compares it to the expected value for the target amino acid sequence. A match confirms identity.
Purity (HPLC)
Reports the percentage of the target peptide relative to total sample content. This is measured using High-Performance Liquid Chromatography with UV detection. For example, a purity reading of 99.87% means that 99.87% of the sample is the intended peptide, with only 0.13% being related impurities or degradation products.
Our batches consistently achieve 99%+ purity levels.
Net Peptide Content
Reports the actual amount of active peptide in the vial by weight. This is distinct from gross weight, which includes residual moisture, salts, and counter-ions from the synthesis process. For example, a vial labeled 30mg may show a net peptide content of 33.35mg, indicating a slight overfill to ensure the labeled amount is met or exceeded.
Endotoxin Level
Reports bacterial endotoxin levels, measured in EU/mg (Endotoxin Units per milligram). Acceptable levels are typically below 5 EU/mg. Elevated endotoxins can introduce confounding variables into research results, which is why this test is critical for maintaining experimental validity.
Appearance
Describes the physical appearance of the lyophilized product. The expected appearance is typically "White Lyophilized Powder" or "White to Off-White Lyophilized Powder." Any deviation may indicate degradation or contamination.
Testing Methods Explained
- HPLC (High-Performance Liquid Chromatography)
The sample is dissolved and passed through a chromatography column under high pressure. Different components separate based on their chemical properties, and a UV detector measures the relative concentration of each peak. The main peak represents the target peptide; smaller peaks represent impurities. - Mass Spectrometry (MS)
The peptide is ionized and its mass-to-charge ratio is measured. The observed molecular weight is compared to the theoretical molecular weight calculated from the amino acid sequence. A match within acceptable tolerance confirms identity. - LAL Testing (Limulus Amebocyte Lysate)
A biological assay that uses a reagent derived from horseshoe crab blood cells to detect and quantify bacterial endotoxins. This is the industry-standard method for endotoxin detection.
Batch Traceability
Every batch we sell is assigned a unique batch number that connects it to its COA. You can look up any batch using our Batch Lookup Tool by selecting the product SKU and batch number found on your vial label.
This system ensures full traceability from the testing lab to your bench.
Research Use Only. All products sold by Instant Peptides are supplied solely for laboratory and research use. They are not intended for human or animal consumption, clinical use, diagnostic use, or therapeutic application.