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Published on: June 25, 2018
NMR line-fitting quantification of polysaccharide N-acylurea-based modification in glycoconjugates of Salmonella
Raine Garrido1, Jean Pierre Soubal1, Leonid Torres1
1Finlay Institute of Vaccines, Ave 27, No. 19805, La Lisa 17100, Havana, Cuba.
Abstract:
The polysaccharides modification via carbodiimide reaction is one of the most applied methods for obtaining conjugated vaccines against Salmonella enterica. However, N-acylurea carbodiimide adduct generated in the process is a critical impurity in carbohydrate-based vaccines. A quantitative NMR method was developed for assessing the N-acylurea carbodiimide adduct impurity. The procedure was based on line-fitting facilities for processing the NMR signals on complex spectra. The method showed good linearity, accuracy and precision under inter-operator variation (relative standard deviation <5%). Copyright © 2017 John Wiley & Sons, Ltd.

