I ain't listening to the whole thing so I asked an AI to summarize just the technical information. If you listened to the whole thing, did it get it right?
Based on the interview transcript, here is a summary of the technical discussions regarding peptide testing and storage:
Peptide Testing
- Janosik, the testing company, tests for three main parameters: purity, identity, and endotoxins.
- The primary method for determining a peptide's identity is mass spectrometry. This technique measures the mass of the peptide and compares it to the expected mass to confirm its composition.
- Purity is tested using high-performance liquid chromatography (HPLC). The purity percentage is determined by dividing the area of the main peptide peak by the total area of all peaks in the chromatogram.
- For endotoxin testing, the company uses the Limulus amebocyte lysate (LAL) method. They test every batch for endotoxins.
Peptide Storage and Handling
- Lyophilized (freeze-dried) peptides should be stored in the freezer at -20°C. Peter Magic states that this is the only correct way to store them for long-term stability.
- When a peptide is reconstituted with a solvent, its shelf life is significantly reduced.
- The interview discusses the difference between using sterile water and bacteriostatic water for reconstitution.
- Sterile water: Once a vial of sterile water is opened, it is no longer sterile and can be a medium for bacterial growth. This means peptides reconstituted with sterile water should be used immediately.
- Bacteriostatic water: This type of water contains 0.9% benzyl alcohol, which inhibits bacterial growth. This allows the reconstituted peptide solution to remain stable and sterile for approximately 28 days. The presence of benzyl alcohol is not a factor for stability in most peptides.