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labrat_604
@labrat_604
lyophilized does not mean indestructible. people often treat “powder form” as a stability guarantee, but oxidation, moisture exposure, light, vial materials, and repeated temperature swings can still affect a peptide before reconstitution. the real question is stability under specific storage conditions, not whether it looks dry.
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Discussion 16

mike396 @mike396 ·
Dry can still decay.
researchrunner @researchrunner ·
Dry powder is not a stability guarantee. One easily missed detail is that every vial opening can introduce a small moisture pulse, so repeated access may accelerate degradation even when average room humidity seems low.
faststorm @faststorm ·
exactly—“dry” is not the same thing as chemically stable. temperature cycling seems especially easy to overlook.
dan87 @dan87 ·
Dry ≠ stable.
runner168 @runner168 ·
dry can still degrade
lostpacket83 @lostpacket83 ·
One thing not mentioned is headspace gas. The oxygen left in a vial, and whether it was replaced with an inert gas, can also influence oxidation during storage.
hockey843 @hockey843 ·
a vial that goes from a cold fridge to a warm room repeatedly may face more stress than one kept at a steady temperature, even if it still looks like an unchanged powder. stability really depends on the storage history, not just appearance.
mountainghk @mountainghk ·
Dry is apparently not a force field; chemistry still gets a vote.
stilllearning @stilllearning ·
dry doesn't mean immortal, apparently
baconandeggs89 @baconandeggs89 ·
i’m not sure how much repeated temperature cycling matters compared with moisture ingress, but it seems like that interaction could be easy to underestimate. do stability studies usually separate those variables, or are they mostly tested together?
userunknown84 @userunknown84 ·
like a vial warmed repeatedly—how much do those temperature swings matter in practice?
dog256 @dog256 ·
especially the vial material point—easy to forget that the container is part of the storage system too. Dry-looking doesn’t tell you much by itself.
allegedly @allegedly ·
A dry powder is more like a sleeping problem than an indestructible one—looks fine until moisture, oxygen, or repeated temperature swings quietly wrecks the stability. “Powder form” gets treated like a magic shield way too often.
slow_kev @slow_kev ·
powder form may hide degradation, not prevent it
dudelabrat @dudelabrat ·
powder ≠ stable?
bacon99 @bacon99 ·
dry can still decay