The effect of D-(+)-glucosamine, N-acetyl-D-glucosamine and tetraethylene glycol on the stability of oxytocin in aqueous solution

M. Ghasemisarabbadieh, S. J. Sigurdsson, F. V.Nu Dong, S. Gizurarson, B. R. Sveinbjörnsson

Research output: Contribution to journalArticlepeer-review

Abstract

The aim of the present study was to identify the effect of D-(+)-glucosamine, N-acetyl-D-glucosamine, tetraethyleneglycol, and the mixture of these additives on the stability of oxytocin in phosphate and acetate buffer solutions, at pH 4.5. Our findings demonstrate that tetraethyleneglycol has a destabilizing effect on oxytocin in both phosphate buffer and acetate buffer. D-(+)-Glucosamine hydrochloride had small to negligible effect at low concentrations, yielding a slight improvement lower concentrations of the additive in the presence of the buffers used, but at higher concentrations it increased the rate of degradation. N-Acetyl-D-glucosamine showed a possibly slight improvement to the stability of oxytocin. It is hypothesized that the different effect of N-acetyl-D-glucosamine compared to D-(+)-glucosamine is a consequence of the free amine group in D-(+)-glucosamine promoting a faster degradation, while the amino group is acetylated in N-acetyl-D-glucosamine and therefore no longer reactive in the same way. While it remains unclear why tetraethyleneglycol has a destabilizing effect on oxytocin, the D-(+)-glucosamine results aid in deepening our understanding of the degradation mechanism of oxytocin.
Original languageEnglish
Pages (from-to)480-483
Number of pages4
JournalDie Pharmazie
Volume76
Issue number10
DOIs
Publication statusPublished - 1 Oct 2021

Bibliographical note

Funding Information:
Funding: This research was funded by the Icelandic Technology Development Fund, grant number 164072-0613.

Publisher Copyright:
© 2021 Govi-Verlag Pharmazeutischer Verlag GmbH. All rights reserved.

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