#stability
6 pieces tagged stability.
- HandlingWhy some peptides dissolve badly: charge, hydrophobicity and gellingNet charge, isoelectric point, hydrophobic residue content and beta-sheet self-assembly decide whether a peptide dissolves clear, turns cloudy or gels. The chemistry, with worked examples from published sequences.
- HandlingWhere the 28 days number comes from (it is not peptide data)The 28-day figure often attached to peptides is a pharmacy standard for preserved multi-entry containers, tied to a 28-day microbiology test. It measures preservative performance, not what happens to a peptide in solution.
- How it is madeWhat lyophilized means, and why peptides ship as powderFreezing, sublimation and desorption in plain terms: why a lyophilized cake looks the way it does, what residual moisture and a collapsed cake mean analytically, and why the label mass is nominal.
- How it is madeWhy a factory-made peptide spray differs from a vialWhat a formulated aqueous peptide product contains (buffer, tonicity agent, preservative), how preservative efficacy is tested under USP <51>, why formulated products carry an in-use period, and what a dissolving strip is made of.
- HandlingDo lyophilized peptides survive heat in transit?Why a dry solid is more stable than a solution, what ICH-style testing at 25 °C and 40 °C has shown for lyophilized peptides, what changes first, and why a warm parcel is a different question for a powder than for a liquid.
- HandlingFreeze-thaw, aliquots and the residues that oxidizeWhich amino acids oxidize, deamidate or hydrolyse, what freezing and thawing do to a solution physically, what manufacturers' guides say about repeated freezing, and where those residues sit in the sequences we stock.
Nothing here is medical advice. Everything on this site is supplied for laboratory research use only.