Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
Roshan Devakumar
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Archive — page 10
227 piecesThree services, one lot, and a spread of two and a half points
Duplicate submissions under different names test within-laboratory repeatability, which is a different quantity from between-laboratory reproducibility.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
Endotoxin is not a microorganism, and killing the bacteria does not remove it
Three compendial method families are in routine use and a fourth, based on a recombinant enzyme rather than crab lysate, is now compendial in its own right.
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.
What twenty companies say about storage, and what they have measured
A stability programme needs a protocol, defined conditions, a stability-indicating method and time. Time is the ingredient no commercial testing service can sell.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
Endotoxin is not a microorganism, and killing the bacteria does not remove it
The limit for a parenteral product is calculable from the dose and the body weight in two lines. Almost nobody in this trade performs the calculation.
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.
PeptideMeter result on a Chengdu exenatide lot lands 3.6 points below the supplier’s figure
The supplier has not disputed the finding. It has not explained the gap either.
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.
Freezing a reconstituted vial: the ice-water interface problem
At low concentrations a measurable fraction of peptide can adsorb to glass and plastic surfaces, and the loss is largest exactly where it is least expected.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
PeptideMeter result on a Zhuhai cagrilintide lot lands 1.5 points below the supplier’s figure
The report states the gradient, the wavelength and the integration threshold, which is more than most.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
What the sequence tells you about how a peptide will fail
The sequence predicts the failure mode. A methionine predicts oxidation; an asparagine followed by a glycine predicts deamidation; a cysteine predicts disulphide scrambling.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
Asparagine, glycine, and the two residues that decide a shelf life
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.