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Practice · Storage & stability · continued

Power cut for eleven hours: how I assessed it afterwards posts 31–60

This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1.

CB
c.bakkerTL222 Aug 2025#31
JN
j.nascimentoTL223 Aug 2025#32
am.wikstrom, post #21: Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear. Go to post

The arithmetic in post #30 is right; the assumption feeding it is the part to check.

Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear.

7 likes in reply to #21 11mo
SL
s.leclercTL4 Moderator24 Aug 2025#33

Post #32 put the caveat in the right place and I want to underline it.

A methods point on power cut for eleven hours rather than a substantive one: if the comparison is not like for like, the difference you are measuring is the difference in method.

0 likes 11mo
MB
m.brobergTL225 Aug 2025#34

Agreed on power cut for eleven hours, with one qualification that I think matters. The reasoning holds for the case as described. Change the starting assumption and it does not, and the starting assumption is the part nobody states.

0 likes 11mo
AF
a.friskTL226 Aug 2025#35
b.petrov, post #16: Adding the measurement that post #13 says would settle it. Temperature excursions in transit are common and are not all equal. A few hours warm is a different event from three days warm, and neither is visible in the vial on arrival. It is worth checking rather than assuming, which costs nothing. Go to post

Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and proceed.

I am not the right person to answer the follow-up to this.

12 likes in reply to #16 11mo
TN
t.ndiayeTL227 Aug 2025 · edited#36
GDashwood, post #20: Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and proceed. Go to post

Two people in this thread mean different things by power cut for eleven hours and are disagreeing about the definition while believing they are disagreeing about the facts. Worth pausing to define it.

4 likes in reply to #20 11mo
NM
n.moreauTL228 Aug 2025#37

Post #35 and I disagree about the size of the effect, not about the direction.

Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear.

0 likes 11mo
PM
p.mbekiTL229 Aug 2025#38

Taking post #35 at face value and following it one step further.

The reason power cut for eleven hours keeps being re-asked is that the answer is conditional and people quote it without the condition. It is not that the answer is unknown.

26 likes 11mo
TH
TL4_HalvorsenTL4Leader · Journal club30 Aug 2025#39
a.thorne, post #5: Power cut for eleven hours is well covered in the tag pages, and the older discussions are better than the recent ones because they were argued out properly. Worth twenty minutes before adding to this one. Go to post

I read post #35 twice before replying, because I had assumed the opposite.

Taking power cut for eleven hours seriously for a moment rather than deflecting: the honest position is that the community has observations and no controlled comparison, and those two things support very different sentences.

8 likes in reply to #5 11mo
RE
r.ekstromTL231 Aug 2025#40
OP
o.pasqualeTL1Member31 Aug 2025#41

Adding the measurement that post #39 says would settle it.

Temperature excursions: if a vial sat at room temperature for a time, the question is whether the excursion was long enough to cause damage. Hours at room temperature is usually low risk. Days to weeks raises the risk. If you are unsure, contacting the supplier is more informative than guessing.

12 likes 11mo
ID
i.dumitruTL21 Sep 2025#42

Post #38 describes the usual case. This is about the unusual one.

Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear.

26 likes 11mo
EL
endpoint_lineTL3Regular2 Sep 2025#43
k.ogunleye, post #4: Coming back to post #2, because the follow-up matters more than the original answer. Marking my uncertainty on power cut for eleven hours explicitly. I am confident about the direction, much less confident about the size, and not confident at all that it generalises past the case in the first post. Go to post

Thank you for taking the time. That was more work than a reply usually is.

0 likes in reply to #4 11mo
KK
k.karlsenTL23 Sep 2025#44
n.stanescu, post #14: Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear. Go to post

The claim about power cut for eleven hours upthread is stronger than its source supports. I have read the source. The source says "associated with" and the post says "causes".

2 likes in reply to #14 11mo
HN
h.nicolaidesTL34 Sep 2025#45
PO
p.onwukaTL25 Sep 2025#46

Answering the question post #42 raises rather than the one it answers.

Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and proceed.

Take it as a starting point and not as a specification.

19 likes 11mo
LA
l.aaltonenTL3Regular6 Sep 2025#47

Something worth flagging about power cut for eleven hours: the strongest-sounding claims in this thread are the ones with no source attached, which is the usual pattern and not a coincidence.

0 likes 11mo
DN
d.ndiayeTL27 Sep 2025 · edited#48
p.lindqvist, post #10: Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear. Go to post

Reframing power cut for eleven hours slightly, because I think the disagreement is about the question rather than the answer. If the question is "does it happen", yes. If it is "how often", nobody here knows.

0 likes in reply to #10 11mo
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WickramasingheTL2Member7 Sep 2025#49
am.wikstrom, post #21: Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear. Go to post

Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear.

On balance I think that is right, and I would not bet much on it.

0 likes in reply to #21 11mo
WM
w.moreauTL28 Sep 2025#50

Filing a mild objection to the consensus on power cut for eleven hours. Mild because I might be wrong; an objection because nobody has addressed the case that does not fit.

4 likes 11mo
BA
b.adeyemiTL29 Sep 2025#51

This is the first time the answer has come with its own limits attached. Appreciated.

7 likes 11mo
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IMainwaringTL3Regular10 Sep 2025#52
d.ndiaye, post #48: Reframing power cut for eleven hours slightly, because I think the disagreement is about the question rather than the answer. If the question is "does it happen", yes. If it is "how often", nobody here knows. Go to post

This follows post #49 rather than contradicting it.

The version of power cut for eleven hours that circulates here is a simplification of a simplification. It is not wrong, but it has lost the conditions under which it holds, and those conditions are where the interesting cases live.

1 like in reply to #48 11mo
IB
i.beaulieuTL211 Sep 2025#53

Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and proceed.

I would rather be precise about what I do not know than vague about what I do.

0 likes 11mo
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NLoughranTL3Regular12 Sep 2025#54

Practical answer on power cut for eleven hours, since the theoretical one is upthread: do the simplest check first, write down the result, and only then decide whether the complicated explanation is needed. It usually is not.

24 likes 10mo
JC
j.cabreraTL212 Sep 2025#55

The failure mode on power cut for eleven hours is boring rather than dramatic. It is almost always the step everyone assumes was done correctly because it is too simple to get wrong.

4 likes 10mo
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FFaulknerTL3Regular13 Sep 2025 · edited#56
p.onwuka, post #46: Answering the question post #42 raises rather than the one it answers. Visible particulate is a strong signal in the other direction: it is a reason to stop and ask rather than to filter and proceed. Take it as a starting point and not as a specification. Go to post

Taking post #53 at face value and following it one step further.

Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear.

0 likes in reply to #46 10mo
VO
v.okonkwoTL214 Sep 2025#57

Temperature excursions in transit are common and are not all equal. A few hours warm is a different event from three days warm, and neither is visible in the vial on arrival.

Genuinely open to being wrong about this one.

0 likes 10mo
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OFalkenbergTL1Member15 Sep 2025#58

Power cut for eleven hours is a question about a distribution, not about a value, and treating it as a value is what produces the confident wrong answers.

17 likes 10mo
FC
f.chowdhuryTL216 Sep 2025#59
j.cabrera, post #55: The failure mode on power cut for eleven hours is boring rather than dramatic. It is almost always the step everyone assumes was done correctly because it is too simple to get wrong. Go to post

I have no financial interest in anything named in this thread and I want to say so before I comment on power cut for eleven hours, because it is the sort of subject where it matters.

0 likes in reply to #55 10mo
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OstrowskiTL2Member17 Sep 2025#60

Fair, and the limits you put on it are the part I will remember.

23 likes 10mo