First-Lot QA Checklist for Peptide API Buyers

The first peptide API lot is where pharmacy QA learns whether a supplier's documentation chain is real. The review should happen before recurring volume is promised, because the first lot establishes the analytical scope, traceability expectations, and deviation-response cadence for every later order.

What should be in a first-lot QA checklist for peptide API?

A first-lot QA checklist should confirm the lot identity, COA completeness, HPLC purity and method, mass-spec identity, counter-ion and water content, residual solvents, endotoxin and microbial limits where required, stability availability, storage and shipment conditions, retain-sample policy, deviation response, and whether audit-support documents can be provided for regulated buyers.

First-lot review items

• Lot number, manufacture date, retest date, storage condition, and signed release decision
• HPLC chromatogram with method conditions and integration table
• Mass-spec identity report and, for long peptides, sequence-level evidence when needed
• Counter-ion, water content, residual solvents, and appearance
• LAL endotoxin and USP microbial limits where the route or pathway requires them
• Stability summary or study availability for inventory planning
• Retain-sample policy, OOS/deviation response path, and supplier QA contact

Decision rule

Accept the first lot only if the supplier can connect the documents to the exact shipped batch and answer method questions in writing. If a document is representative rather than lot-specific, record that explicitly and decide whether the workflow can tolerate that evidence level before scaling.