which peptides are actually light sensitive and how much does it matter?

routine_orderSenior Analyst

Amber vials and "keep away from light" are everywhere but the specifics never are.

What I understand: photodegradation is driven mainly by certain residues (tryptophan, tyrosine, phenylalanine, cysteine) absorbing UV and near-UV. So it depends on the sequence, it's not a general property of peptides.

What I can't determine: how much ordinary indoor light over ordinary handling times actually matters, vs an abundance of caution inherited from formulation guidelines written for very different exposure.

My assumption is the guidance is cheap to follow so nobody bothers quantifying it. If anyone has actual photostability data I'd like to see it.

3 replies4 upvotesStorage, Reconstitution & Supplies

3 replies

  • BarrierFunctionSenior Analyst

    Your read is right, it's residue dependent. The guidance is conservative because photostability testing is a regulatory requirement and the resulting statement is cheap to carry forward. For brief handling in indoor light I'd expect the effect to be small, but "I'd expect" is doing the work, I can't point you at data for these specific compounds.

    4 upvotes

    • routine_orderSenior Analyst

      Appreciate the honest uncertainty, that's about where I'd landed.

      2 upvotes

  • quick_qSenior Analyst

    so amber vials are mostly caution?

    2 upvotes

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