Every batch we supply ships with a Certificate of Analysis (COA). This page explains what's on it, why it matters, and how to store the material once it arrives — it's general lab reference information, not usage or dosing guidance.

What's on a Certificate of Analysis

Identity. Mass spectrometry confirms the molecule's measured mass matches the expected mass for its sequence. This is what tells you the vial actually contains the peptide it's labeled as, not a related or degraded compound.

Purity. HPLC (high-performance liquid chromatography) separates the sample into its components and reports the target peptide as a percentage of total peak area — commonly ≥98% for research-grade material. A clean chromatogram shows one dominant peak; shoulder peaks or a cluttered baseline indicate impurities or breakdown products.

Appearance & solubility. A visual description (typically a white to off-white lyophilized powder) and basic solubility notes, useful for confirming the material looks as expected on arrival.

Batch/lot number and date. Ties the specific vial in hand to the specific analytical run that tested it, so results are traceable and comparable across orders.

Storage recommendation. The conditions the manufacturer's own stability testing supports — worth checking against the guidance below.

Every Aminose product page links to a request for the current COA on that batch. If anything on it doesn't match what's described here, or doesn't match the product page, contact us before using the material in an experiment.

Storage & Handling for Laboratory Use

Temperature. Store lyophilized (freeze-dried) peptides at −20°C for short-term lab use; −80°C is preferable for long-term storage. Some peptides tolerate refrigeration at 4°C, but freezer storage is safer as a default.

Moisture. Let a vial reach room temperature before opening it — opening a cold vial lets ambient humidity condense inside, and moisture is one of the fastest ways lyophilized peptides degrade.

Light. Keep vials in their original packaging or a dark container; prolonged light exposure can degrade sensitive residues.

Freeze–thaw cycles. Repeatedly freezing and thawing the same vial accelerates degradation. If a protocol calls for repeated small amounts over time, aliquot the material into single-use portions after reconstitution instead of returning the stock vial to the freezer.

Oxidation-prone residues. Peptides containing cysteine, methionine, or tryptophan are more susceptible to oxidation. Purging vial headspace with nitrogen or argon before resealing, where practical, can extend stability.

In solution. Once reconstituted for laboratory or assay use, peptide solutions are generally stable under refrigeration for about a week; longer holds should go back in the freezer. This is general laboratory reference guidance, not instructions for human or veterinary administration — see our research use disclaimer.

Questions about a specific batch, or need a COA resent? Get in touch.