A supplier suspends shipping to Germany after 14 consecutive customs detentions
The route did not close because of a rule about peptides.
Stability
Page 9 of 20 of this archive, newest first.
Four millimetres is enough, and the data says so
The insulin injection-technique literature is large, well conducted and directly transferable on questions of depth and tissue. We say where it stops transferring.
A supplier suspends shipping to the Netherlands after 14 consecutive customs detentions
The route did not close because of a rule about peptides.
A supplier suspends shipping to the United Arab Emirates after 13 consecutive customs detentions
The route did not close because of a rule about peptides.
Same mass, different molecule: why identity by mass is not identity
Reversed-phase chromatography runs in an organic, acidic mobile phase that dissociates most non-covalent aggregates on the way to the detector.
What we asked twenty suppliers about stability data
A retest date says that material should be re-examined before use. An expiry date says it should not be used. The trade uses the second word for the first concept.
Mapping a rotation that you will actually follow
A rotation scheme that is too complicated will not be followed. We describe the simple ones that are.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
Date of analysis, date of manufacture, and the gap between them
The interval between manufacture and analysis is the most under-read figure on the page, and the one most likely to matter by the time a vial is opened.
What we asked twenty suppliers about stability data
A retest date says that material should be re-examined before use. An expiry date says it should not be used. The trade uses the second word for the first concept.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
Twenty-eight days is a number from somebody else’s product
Every degradation pathway accelerates by orders of magnitude on reconstitution, because the solvent that lyophilisation removed is the reagent most of them need.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
The intramuscular injection nobody intended
A 4 mm needle at ninety degrees without a skin pinch is adequate for essentially all adults. The persistence of 12.7 mm needles in this market is habit, not reasoning.
A supplier suspends shipping to Argentina after 14 consecutive customs detentions
The route did not close because of a rule about peptides.
A supplier suspends shipping to Canada after 19 consecutive customs detentions
The route did not close because of a rule about peptides.
A supplier suspends shipping to Turkey after 20 consecutive customs detentions
The route did not close because of a rule about peptides.
Oxidation, and the peroxide that came in with the surfactant
An isoaspartate rearrangement changes the molecule and not the mass. A method that confirms identity by molecular weight alone will report it as the parent compound.
A supplier suspends shipping to Saudi Arabia after 6 consecutive customs detentions
The route did not close because of a rule about peptides.