Short answer: solvent choice for a research peptide is dictated by the sequence, not by habit.
Net charge and hydrophobicity predict which solvent will dissolve a given peptide cleanly, and the wrong first solvent can aggregate material irreversibly before a single measurement is taken.
Sequence charge at neutral pH is the primary predictor of aqueous solubility.
Peptide bonds absorb in the far ultraviolet, which is why solvent choice also affects downstream quantification.
Once a peptide has aggregated, filtration removes the aggregate but does not recover the material.
Solvent used, volume and date belong in the laboratory record, not in memory.
Disclosure
This article is provided for research and informational purposes only. The materials discussed are laboratory reagents intended for in vitro and preclinical research use. Nothing here describes or endorses use in humans, and no claim is made regarding any outcome, benefit, or application beyond laboratory research.
[feast_advanced_jump_to] Why does the same peptide dissolve for one laboratory and not another?
Because the two laboratories almost certainly used different solvents, different orders of addition, or different starti...