What Should You Check Before Using a Peptide Raw Material for Lyophilization?

[Dories]

Peptide quality is not determined by purity alone.

Before a peptide raw material enters the formulation and lyophilization process, several factors deserve attention:

1. Identity confirmation – Is the peptide identity verified by appropriate analytical methods?
2. Purity and related substances – What does the HPLC profile show?
3. Batch consistency – Are the analytical results consistent across different batches?
4. Residual solvents and moisture – Are these parameters controlled and documented?
5. Stability and storage – Are the recommended storage and transportation conditions clearly defined?
6. Documentation – Is batch-specific COA available, with supporting analytical data where applicable?

For peptide manufacturers and processing laboratories, reliable upstream quality control is an important part of building a consistent downstream process.

In your experience, which quality parameter is most often overlooked when evaluating peptide raw material suppliers?

I'd be interested in hearing different perspectives from the industry.

Disclosure: I work in peptide raw material manufacturing.