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storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the published stability studies do and do not cover.

646 questions · sorted by votes · page 1 of 27

41 votes2 answers57k views
What happens to mazdutide after sixteen weeks at minus 20 °C in solution?

Details up front: mazdutide · sixteen weeks · minus 20 °C. I suspect the usual explanation for this is wrong, or at least incomplete. I am aware this may have a…

peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
shelf-life
shelf-life

How long a preparation remains within specification: labelled expiry for a sealed lyophilised vial, beyond-use dating after reconstitution, and…

301 questions
asked by cap_the_luer 15k · 2.1 years ago
41 votes 5 answers46k views
What is the thermal exposure on a Changsha to Ireland lane in summer?

Numbers first: Changsha · Ireland. This is presented as though it settles something, and I am not convinced it does. I have two documents that appear to disagree,…

cold-chain
cold-chain

Keeping material within a temperature window from manufacture to use: phase-change packs versus dry ice, thermal mass, transit-lane temperature…

524 questions
international-shipping
international-shipping

Cross-border movement of research material: transit lanes and their thermal profiles, tracked versus untracked, declaration accuracy, and what…

427 questions
storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
asked by seven_day_half 16k · 23 months ago
41 votes 5 answers40k views
Is there any published stability data for mazdutide at room temperature?

What I have: mazdutide · room temperature. I am asking for verification rather than opinion, ideally with something I can read myself. It is possible the evidence…

peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
clinical-trials
clinical-trials

Reading the primary literature properly: estimands, intention-to-treat versus per-protocol, confidence intervals, absolute versus relative…

913 questions
asked by rania_haddad 17k · 21 months ago
41 votes 5 answers37k views
How long does liraglutide stay within specification at 25 °C once reconstituted?

The specifics, since they change the answer: liraglutide · 25 °C. I want a method I can write down and repeat, not a rule of thumb. I would rather over-engineer this…

peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
shelf-life
shelf-life

How long a preparation remains within specification: labelled expiry for a sealed lyophilised vial, beyond-use dating after reconstitution, and…

301 questions
asked by bridget_nyathi 16k · 23 months ago
41 votes5 answers36k views
Does deamidation dominate for survodutide held at 4 °C?

The particulars: deamidation · survodutide · 4 °C. I would like the mechanism, because I want to be able to reason about the cases nobody has written about. I have…

peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
hplc
hplc

Reverse-phase high-performance liquid chromatography, the workhorse purity method. Column chemistry, mobile-phase choice, gradient slope,…

466 questions
asked by anders_vestby 17k · 20 months ago
41 votes5 answers33k views
Does a GLP-1 receptor agonist adsorb measurably to the vial wall at 4 mg/mL?

Details up front: a GLP-1 receptor agonist · 4 mg/mL. I can do the algebra. I am not confident about the conversion factors. If there is a standard way to lay this…

peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
content-assay
content-assay

Quantified content: how many milligrams of peptide are actually in the vial, measured against a calibrated reference standard. A separate test…

438 questions
storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
asked by sinead_gaffney 14k · 2.0 years ago
41 votes 5 answers30k views
How do I plan for an oral semaglutide supply interruption without stockpiling badly?

I have continuous temperature data for the period in question, which is unusual and I would like to use it. I am at the decision point and I would rather think it…

storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
discontinuation
discontinuation

Stopping treatment: tapering versus abrupt cessation, what the trial withdrawal arms measured, clinically driven stops, and the practical planning…

21 questions
cost-analysis
cost-analysis

Cost arithmetic done honestly: cost per milligram after dead-space loss, list versus net price, comparing a multi-dose vial to a fixed-dose pen,…

261 questions
asked by Dr_Ingrid_Baumgartner 39k · 2.2 years ago
41 votes 5 answers27k views
Does fibrillation dominate for survodutide held at minus 20 °C?

The specifics, since they change the answer: fibrillation · survodutide · minus 20 °C. I understand the observation; what I do not understand is the mechanism behind…

peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
hplc
hplc

Reverse-phase high-performance liquid chromatography, the workhorse purity method. Column chemistry, mobile-phase choice, gradient slope,…

466 questions
asked by ellis_thorne 17k · 20 months ago
41 votes 5 answers24k views
What is the thermal exposure on a Zhuhai to Poland lane in summer?

What I have: Zhuhai · Poland. This is presented as though it settles something, and I am not convinced it does. I have two documents that appear to disagree, which is…

cold-chain
cold-chain

Keeping material within a temperature window from manufacture to use: phase-change packs versus dry ice, thermal mass, transit-lane temperature…

524 questions
international-shipping
international-shipping

Cross-border movement of research material: transit lanes and their thermal profiles, tracked versus untracked, declaration accuracy, and what…

427 questions
storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
asked by haze_check 17k · 2.2 years ago
41 votes0 answers18k views
Is there any published stability data for liraglutide at minus 20 °C?

The particulars: liraglutide · minus 20 °C. I would like to know whether this claim survives contact with evidence. If the answer is "nobody has tested that", I would…

peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
clinical-trials
clinical-trials

Reading the primary literature properly: estimands, intention-to-treat versus per-protocol, confidence intervals, absolute versus relative…

913 questions
asked by seamus_brady 17k · 21 months ago
40 votes 4 answers68k views
Does survodutide adsorb measurably to the vial wall at 20 mg/mL?

The case in front of me: survodutide · 20 mg/mL. I want the working, not the result — I need to be able to redo it with different numbers. I care about the precision…

peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
content-assay
content-assay

Quantified content: how many milligrams of peptide are actually in the vial, measured against a calibrated reference standard. A separate test…

438 questions
storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
asked by mg_per_ml 12k · 2.3 years ago
40 votes5 answers60k views
Why does aggregation accelerate at minus 20 °C rather than proceeding linearly?

Setup, so nobody has to ask: aggregation · minus 20 °C. I keep seeing this stated as a fact with no explanation attached, and unexplained facts make me suspicious. My…

peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
hplc
hplc

Reverse-phase high-performance liquid chromatography, the workhorse purity method. Column chemistry, mobile-phase choice, gradient slope,…

466 questions
asked by sunniva_dahl 11k · 23 months ago
40 votes 3 answers57k views
Is there any published stability data for ecnoglutide at 2–8 °C?

The case in front of me: ecnoglutide · 2–8 °C. The claim is plausible, which is exactly why I want to check it. I am able to read a paper if someone points me at one.…

peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
clinical-trials
clinical-trials

Reading the primary literature properly: estimands, intention-to-treat versus per-protocol, confidence intervals, absolute versus relative…

913 questions
asked by p_mkhize 41k · 2.0 years ago
40 votes 4 answers50k views
Is 37 °C an acceptable storage condition for lyophilised tirzepatide?

Concretely: 37 °C · tirzepatide. The claim is plausible, which is exactly why I want to check it. I am able to read a paper if someone points me at one. Is there data…

storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
shelf-life
shelf-life

How long a preparation remains within specification: labelled expiry for a sealed lyophilised vial, beyond-use dating after reconstitution, and…

301 questions
asked by oona_kekkonen 16k · 22 months ago
40 votes 5 answers41k views
How long does dulaglutide stay within specification at 4 °C once reconstituted?

What I am working with: dulaglutide · 4 °C. This is a procedural question rather than a theoretical one, and I would like the procedure rather than the theory. What I…

peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
shelf-life
shelf-life

How long a preparation remains within specification: labelled expiry for a sealed lyophilised vial, beyond-use dating after reconstitution, and…

301 questions
asked by label_claim 11k · 2.3 years ago
40 votes5 answers34k views
What is the thermal exposure on a Suzhou to Germany lane in summer?

Conditions: Suzhou · Germany. The figures are clear enough; the question is what they mean and what they do not. I can supply the numbers if the specifics change the…

cold-chain
cold-chain

Keeping material within a temperature window from manufacture to use: phase-change packs versus dry ice, thermal mass, transit-lane temperature…

524 questions
international-shipping
international-shipping

Cross-border movement of research material: transit lanes and their thermal profiles, tracked versus untracked, declaration accuracy, and what…

427 questions
storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
asked by noor_alhassan 15k · 2.2 years ago
40 votes0 answers32k views
Why does aggregation accelerate at minus 80 °C rather than proceeding linearly?

Setup, so nobody has to ask: aggregation · minus 80 °C. I keep seeing this stated as a fact with no explanation attached, and unexplained facts make me suspicious. My…

peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
hplc
hplc

Reverse-phase high-performance liquid chromatography, the workhorse purity method. Column chemistry, mobile-phase choice, gradient slope,…

466 questions
asked by eoin_mcgarry 16k · 23 months ago
40 votes5 answers31k views
Does aggregation dominate for a GLP-1 receptor agonist held at 4 °C?

Setup, so nobody has to ask: aggregation · a GLP-1 receptor agonist · 4 °C. I keep seeing this stated as a fact with no explanation attached, and unexplained facts…

peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
hplc
hplc

Reverse-phase high-performance liquid chromatography, the workhorse purity method. Column chemistry, mobile-phase choice, gradient slope,…

466 questions
asked by ruaidhri_o_shea 51k · 23 months ago
39 votes 5 answers74k views
Is an insulated cool box good enough for storing reconstituted ecnoglutide?

The specifics, since they change the answer: an insulated cool box · ecnoglutide. I would like to define my thresholds before I have a result, for obvious reasons. I…

storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
cold-chain
cold-chain

Keeping material within a temperature window from manufacture to use: phase-change packs versus dry ice, thermal mass, transit-lane temperature…

524 questions
harm-reduction
harm-reduction

Reducing avoidable risk where a decision has already been made: independent verification before use, sterility practice, dose arithmetic checked…

445 questions
asked by rae_oyelowo 21k · 2.3 years ago
39 votes 5 answers71k views
Does fibrillation dominate for semaglutide held at 2–8 °C?

For reference: fibrillation · semaglutide · 2–8 °C. I understand the observation; what I do not understand is the mechanism behind it. I have read the two review…

peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
hplc
hplc

Reverse-phase high-performance liquid chromatography, the workhorse purity method. Column chemistry, mobile-phase choice, gradient slope,…

466 questions
asked by klara_novotna 16k · 2.2 years ago
39 votes 5 answers68k views
Is a laboratory refrigerator good enough for storing reconstituted retatrutide?

What I have: a laboratory refrigerator · retatrutide. I would rather over-plan the first cycle and simplify later. I am prepared to do the work if someone can tell me…

storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
cold-chain
cold-chain

Keeping material within a temperature window from manufacture to use: phase-change packs versus dry ice, thermal mass, transit-lane temperature…

524 questions
harm-reduction
harm-reduction

Reducing avoidable risk where a decision has already been made: independent verification before use, sterility practice, dose arithmetic checked…

445 questions
asked by tabular_nums 47k · 2.3 years ago
39 votes 5 answers50k views
Is a wine cooler good enough for storing reconstituted survodutide?

The specifics, since they change the answer: a wine cooler · survodutide. I would like to define my thresholds before I have a result, for obvious reasons. I want a…

storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
cold-chain
cold-chain

Keeping material within a temperature window from manufacture to use: phase-change packs versus dry ice, thermal mass, transit-lane temperature…

524 questions
harm-reduction
harm-reduction

Reducing avoidable risk where a decision has already been made: independent verification before use, sterility practice, dose arithmetic checked…

445 questions
asked by mira_sundqvist 19k · 2.1 years ago
39 votes 4 answers50k views
How many freeze-thaw cycles will a GLP-1 receptor agonist at 2.5 mg/mL tolerate?

Numbers first: a GLP-1 receptor agonist · 2.5 mg/mL. I can find plenty of assertions about this and almost no reasoning, which is usually a sign that nobody has…

freeze-thaw
freeze-thaw

What repeated freezing does to a peptide in solution: ice-crystal shear at the growing front, freeze-concentration of solutes, pH shifts as buffer…

55 questions
peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
asked by klara_novotna 16k · 2.4 years ago
39 votes 5 answers47k views
Does hydrolysis dominate for orforglipron held at room temperature?

Details up front: hydrolysis · orforglipron · room temperature. I can predict the outcome but I cannot explain it, which means I will get the next case wrong. I would…

peptide-stability
peptide-stability

The chemistry of peptide degradation: deamidation, oxidation, hydrolysis, aggregation and fibrillation, and how temperature, pH, ionic strength,…

832 questions
storage
storage

Storage conditions and their evidence base: minus twenty degrees for powder, refrigerated for solution, protection from light, and what the…

646 questions
hplc
hplc

Reverse-phase high-performance liquid chromatography, the workhorse purity method. Column chemistry, mobile-phase choice, gradient slope,…

466 questions
asked by fiadh_cronin 14k · 2.0 years ago
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