Freeze-drying: primary and secondary drying, collapse temperature, the role of bulking agents and cryoprotectants such as mannitol and trehalose, and how to read a cake for evidence of a bad cycle.
The method section is present, which is unusual enough that I want to make use of it. I would like to know the limits of what can be inferred from this. What I am…
I have accumulated enough vials from enough sources that the cakes now look wildly different from each other, and I have no framework for interpreting that. Examples…
I have a logging thermometer, a box of insulin syringes and no illusions about my worktop being sterile. An unexpected observation, and I would like a differential…
Two things I want to understand properly rather than by rule of thumb. First: I keep reading that endotoxin survives autoclaving. Autoclaving is 121 degrees under…
Every supplier sheet I have says "store lyophilised powder at −20 °C for long-term, 2–8 °C for short-term, room temperature acceptable for shipping". Nobody explains…
I keep a written log of every draw with date, volume and syringe type. I want to understand what this actually establishes, as opposed to what it is being used to…
This is a recurring problem with one particular shipping lane rather than a one-off. I want to know whether this is a real physical effect or an artefact of how it is…
I have two vials of nominally the same compound from different suppliers. One cake is a dense white puck that sits proud in the vial; the other is a thin, almost…
I keep a written log of every draw with date, volume and syringe type. I would like to understand the steps well enough to explain them to someone else. I have access…
I have photographs before and after reconstitution if the visual detail matters. The figures are clear enough; the question is what they mean and what they do not. I…
Transit was eleven days with two scanning gaps, so the thermal history is partly inferred. I would like the mechanism, because I want to be able to reason about the…
I keep a written log of every draw with date, volume and syringe type. I would like to understand the steps well enough to explain them to someone else. I have access…
I have both a purity figure and a content figure, which is why the discrepancy is visible. I am trying to choose between two options that are usually discussed as…
For context, I am working with a 10 mg presentation and a 2 mL fill. I noticed this today and I have not touched anything since, in case the state is diagnostic. I…
This is the third vial from the same lot, so I can compare against two known-good ones. I suspect the usual explanation for this is wrong, or at least incomplete. I…
The lot number on the vial matches the certificate, which at least rules out the easy problem. I want to know whether this is a real physical effect or an artefact of…
I keep a written log of every draw with date, volume and syringe type. I have the document in front of me and I can read the numbers. What I cannot do is interpret…
HPLC purity, identity confirmation and quantified content on the vial you actually hold. Reports arrive with the chromatogram attached, not just a number.
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