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storage

Page 5 of 27 · 646 questions tagged storage.

646 questions · sorted by votes · page 5 of 27

32 votes5 answers46k views
Is a wine cooler good enough for storing reconstituted retatrutide?

Details up front: a wine cooler · retatrutide. This is a planning question. I know what my options are; I do not know how to weigh them. What I want is the minimum…

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 bounty_hunter_q 18k · 16 months ago
32 votes 5 answers44k views
How many freeze-thaw cycles will cagrilintide at 2.5 mg/mL tolerate?

Numbers first: cagrilintide · 2.5 mg/mL. I would like to understand the steps well enough to explain them to someone else. I have access to a refrigerator with a…

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 area_percent 13k · 2.2 years ago
32 votes 5 answers39k views
Does tirzepatide adsorb measurably to the vial wall at 4 mg/mL?

For reference: tirzepatide · 4 mg/mL. I would rather understand the derivation than memorise the outcome. Two people I asked gave two answers that differ by a factor…

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 ilaria_bertone 43k · 15 months ago
32 votes 2 answers30k views
Does dimerisation dominate for a GLP-1 receptor agonist held at 37 °C?

What I am working with: dimerisation · a GLP-1 receptor agonist · 37 °C. The empirical answer seems settled. The explanation does not. If the honest answer is that…

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 zeynep_arslan 20k · 13 months ago
32 votes0 answers30k views
What happens to cagrilintide after sixteen weeks at minus 80 °C in solution?

Details up front: cagrilintide · sixteen weeks · minus 80 °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 rukhsana_iqbal 14k · 21 months ago
32 votes 3 answers22k views
Why does fibrillation accelerate at 30 °C rather than proceeding linearly?

For reference: fibrillation · 30 °C. I understand the observation; what I do not understand is the mechanism behind it. I have read the two review articles that come…

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 jana_horakova 15k · 17 months ago
32 votes 2 answers18k views
What happens to tirzepatide after ten weeks at 4 °C in solution?

The specifics, since they change the answer: tirzepatide · ten weeks · 4 °C. I would like the mechanism, because I want to be able to reason about the cases nobody…

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 valentina_rossi 16k · 19 months ago
32 votes 4 answers17k views
What happens to dulaglutide after two weeks at 30 °C in solution?

What I am working with: dulaglutide · two weeks · 30 °C. The empirical answer seems settled. The explanation does not. If the honest answer is that nobody knows, 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 noor_alhassan 15k · 12 months ago
32 votes 5 answers16k views
Why does hydrolysis accelerate at 40 °C rather than proceeding linearly?

What I have: hydrolysis · 40 °C. I can predict the outcome but I cannot explain it, which means I will get the next case wrong. I would like to know how confident the…

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 lukas_sedlacek 17k · 14 months ago
32 votes0 answers16k views
Does a phase-change pack hold a tirzepatide shipment for ten days in transit?

For reference: tirzepatide · ten days. I would like the arithmetic checked rather than the conclusion asserted. I have deliberately not used an online calculator…

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 Dr_Fatima_Belkacem 52k · 20 months ago
31 votes 5 answers46k views
Why does oxidation accelerate at 37 °C rather than proceeding linearly?

Concretely: oxidation · 37 °C. This is one of those things that everyone repeats and nobody derives. This matters practically, not just academically, because it…

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 nils_karlberg 13k · 2.1 years ago
31 votes0 answers42k views
Why does aspartimide formation accelerate at 30 °C rather than proceeding linearly?

Concretely: aspartimide formation · 30 °C. I want to know whether this is a real physical effect or an artefact of how it is measured. What prompted the question is…

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 thabo_maseko 20k · 2.0 years ago
31 votes 5 answers36k views
Is minus 20 °C an acceptable storage condition for lyophilised cagrilintide?

Stated plainly: minus 20 °C · cagrilintide. This has the shape of a fact but I cannot find its origin. What I found instead were three secondary sources all citing…

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 ayo_fadipe 19k · 13 months ago
31 votes 5 answers32k views
Does a phase-change pack hold a mazdutide shipment for twenty-one days in transit?

What I have: mazdutide · twenty-one days. I can do the algebra. I am not confident about the conversion factors. If there is a standard way to lay this out, I would…

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 hana_petrikova 19k · 16 months ago
31 votes 5 answers32k views
What happens to survodutide after four weeks at minus 80 °C in solution?

Conditions: survodutide · four weeks · minus 80 °C. I want to know whether this is a real physical effect or an artefact of how it is measured. What prompted the…

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 tadhg_o_riordan 14k · 10 months ago
31 votes 5 answers30k views
Do I need to let a refrigerated vial come to room temperature before drawing?

I have the same lot stored correctly as a comparator, if a side-by-side test would help. I have done this once and I suspect I got away with it rather than got 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
reconstitution
reconstitution

Taking a lyophilised vial to a solution of known concentration: choice of diluent, volume selection, how to add liquid without shearing the cake,…

330 questions
injection-technique
injection-technique

Technique questions: angle, pinch versus flat, aspiration, injection speed, air bubbles, and the handling steps that determine whether you deliver…

90 questions
asked by claudia_ferrante 46k · 12 months ago
31 votes 2 answers28k views
Does retatrutide adsorb measurably to the vial wall at 20 mg/mL?

What I am working with: retatrutide · 20 mg/mL. I have worked this out and I would like someone to find the error, because I suspect there is one. My working so far,…

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 tare_and_weigh 18k · 16 months ago
31 votes 5 answers23k views
Is minus 80 °C an acceptable storage condition for lyophilised survodutide?

The specifics, since they change the answer: minus 80 °C · survodutide. I would like to know whether this claim survives contact with evidence. If the answer is…

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 rhian_prydderch 44k · 10 months ago
31 votes5 answers23k views
What happens to ecnoglutide after four weeks at minus 80 °C in solution?

Conditions: ecnoglutide · four weeks · minus 80 °C. I want to know whether this is a real physical effect or an artefact of how it is measured. What prompted the…

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 plate_count_9k 95k · 2.4 years ago
31 votes 5 answers21k views
Is 4 °C an acceptable storage condition for lyophilised mazdutide?

Setup, so nobody has to ask: 4 °C · mazdutide. This has the shape of a fact but I cannot find its origin. What I found instead were three secondary sources all citing…

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 area_percent 13k · 17 months ago
31 votes3 answers9k views
What is the actual thermal profile of a Guangzhou to Europe lane in August?

I have continuous temperature data for the period in question, which is unusual and I would like to use it. I can parse the result. I am less sure what it licenses me…

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 harriet_lonsdale 14k · 9 months ago
31 votes0 answers8.6k views
How many freeze-thaw cycles will ecnoglutide at 2 mg/mL tolerate?

The case in front of me: ecnoglutide · 2 mg/mL. I am trying to do this correctly the first time rather than learn it by getting it wrong. I have already made one…

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 kofi_mensah 12k · 10 months ago
30 votes 5 answers54k views
Does cagrilintide adsorb measurably to the vial wall at 1 mg/mL?

Numbers first: cagrilintide · 1 mg/mL. I can do the algebra. I am not confident about the conversion factors. If there is a standard way to lay this out, 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
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 bounty_hunter_q 18k · 2.0 years ago
30 votes5 answers34k views
How do I plan for a mazdutide 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. This is a planning question. I know what my options are; 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
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 tandem_gradient 85k · 21 months ago