Abstract
Purpose
To examine the effect of different amine compounds on the chemical degradation of insulin aspart at pharmaceutical formulation conditions.
Methods
Insulin aspart preparations containing amine compounds or phosphate (reference) were prepared and the chemical degradation was assessed following storage at 37°C using chromatographic techniques. Ethylenediamine was examined at multiple concentrations and the resulting insulin–ethylenediamine derivates were structurally characterized using matrix assisted laser desorption ionization time-of-flight mass spectroscopy. The effects on ethylenediamine when omitting glycerol or phenolic compounds from the formulations were investigated.
Results
Ethylenediamine was superior in terms of reducing formation of high molecular weight protein and insulin aspart related impurities compared to the other amine compounds and phosphate. Monotransamidation of insulin aspart in the presence of ethylenediamine was observed at all of the six possible Asn/Gln residues with AsnA21 having the highest propensity to react with ethylenediamine. Data from formulations studies suggests a dual mechanism of ethylenediamine and a mandatory presence of phenolic compounds to obtain the effect.
Conclusions
The formation of high molecular weight protein and insulin aspart related impurities was reduced by ethylenediamine in a concentration dependant manner.
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Abbreviations
- AMPD:
-
2-amino-2-methyl-1,3-propanediol
- BIS-TRIS:
-
2,2-Bis(hydroxymethyl)-2,2′,2″-nitrilotriethanol
- DaMo :
-
monoisotropic mass in Dalton
- DesPhe:
-
desPheB1-N-oxalyl-ValB2
- DTT:
-
1,4-dithiothreitol
- GPC:
-
gel permeation chromatography
- HMWP:
-
high molecular weight protein
- IARI:
-
insulin aspart related impurities
- IEC:
-
ion exchange chromatography
- MALDI-TOF:
-
matrix assisted laser desorption ionization time of flight
- OR:
-
other related impurities
- RP-HPLC:
-
reverse phase high-performance liquid chromatography
- TCEP:
-
tris(2-carboxyethyl)phosphine
- T.E.A.:
-
tetraethylammonium
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Acknowledgements
The authors wish to thank Dorte Aarup Valore and Trine Tølløse for preparing the insulin formulations and conducting the stability studies, Tina Lykke Larsen for performing the HPLC analyses, and Dorte Christensen for technical assistance during the characterization studies.
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Poulsen, C., Jacobsen, D. & Palm, L. Effect of Ethylenediamine on Chemical Degradation of Insulin Aspart in Pharmaceutical Solutions. Pharm Res 25, 2534–2544 (2008). https://doi.org/10.1007/s11095-008-9670-8
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DOI: https://doi.org/10.1007/s11095-008-9670-8