Analytical methods, lot releases and handling. We write about how material is characterized, not about what it does.
Written for people who read certificates. No compound guides, no application notes, no protocols.
A summary sheet with a single purity figure is not a certificate. The minimum useful analytical package, and how to tell a real report from a template.
Residual moisture affects both stated mass and long-term stability. How the measurement is made and what a normal range looks like.
Freeze-dried powder is stable at ambient temperature for days. The cold pack in your carton is a margin against transit delays, not a requirement.
Eleven lots released this month. One failed on residual solvent and was returned to the supplier. The full panel for each is now published.
A lot can be 98% pure by HPLC and still contain substantially less peptide by mass. Water, counterion and residual solvent all sit in the gap.