Quality & Compliance

Every lot we ship passes a four-stage quality protocol — identity, purity, sterility, and stability — before a single vial leaves the lab. Below is the full chain-of-custody, the assays we run, and where to find the data for the lot you receive.

1. Identity Confirmation

Every lot is confirmed by reverse-phase HPLC retention-time matching against a reference standard and verified by electrospray-ionization mass spectrometry (ESI-MS). Observed [M+H]⁺ must match calculated monoisotopic mass within ±1 Da. See Methods & Standards →

2. Purity Determination

Purity is determined by HPLC area-percent at 220 nm using a validated C18 reversed-phase method. Our specification is ≥98.0% by area; typical lot purity is ≥99.0%. Each Certificate of Analysis lists the actual measured purity, retention time, and chromatogram identifier.

3. Endotoxin & Sterility

Endotoxin is tested by LAL kinetic-chromogenic assay (USP <85>) with specification <0.25 EU/mg. Sterility is verified by filter-membrane plating (USP <71>) for any product reconstituted or filled aseptically.

4. Lot Traceability

Every vial carries a lot number cross-referenced against a digitally signed Certificate of Analysis. Look up any lot at Lot Lookup or browse the full library at COA Library.

5. Cold-Chain Handling

All shipments are sent in temperature-monitored insulated packaging with overnight delivery. Lyophilized peptides are stable at room temperature for 7–14 days; for long-term storage, store at -20 °C desiccated.

Research-Use-Only Notice

All products sold by Nexphoria are intended For Research Use Only (RUO). They are not drugs, food, cosmetics, or veterinary products. They are not intended for human or animal therapeutic use, diagnostic use, or any in-vivo application. Purchase is restricted to qualified investigators and licensed research entities in the United States.

Questions about a specific lot, COA, or method? Email [email protected].