Title:HILIC UPLC/ QTof MS Method Development for the Quantification of
AGEs Inhibitors - Trouble Shooting Protocol
Volume: 27
Issue: 4
Author(s): Stefaniya Velichkova, Kenn Foubert*, Mart Theunis and Luc Pieters
Affiliation:
- Natural Products & Food Research and Analysis (NatuRA), Department of Pharmaceutical Sciences, University of
Antwerp, Antwerp, Belgium
Keywords:
Advanced glycation endproducts (AGEs), carboxymethyl-lysine (CML), method development, HILIC, UPLC/QTof MS, AGEs inhibitors.
Abstract:
Objective: The paper reports an attempt to develop and validate a HILIC UPLC/ QTof
MS method for quantifying N-ε-carboxymethyl-L-lysine (CML) in vitro, testing N-ε-
carboxy[D2]methyl-L-lysine (d2-CML), and N-ε-carboxy[4,4,5,5-D4]methyl-L-lysine (d4-CML) as
internal standards.
Methods: During the method development, several challenging questions occurred that hindered
the successful completion of the method. The study emphasizes the impact of issues, generally
overlooked in the development of similar analytical protocols. For instance, the use of glassware
and plasticware was critical for the accurate quantification of CML. Moreover, the origin of atypical
variation in the response of the deuterated internal standards, though widely used in other experimental
procedures, was investigated.
Result: A narrative description of the systematic approach used to address the various drawbacks
during the analytical method development and validation is presented.
Conclusion: Reporting those findings can be considered beneficial while bringing an insightful notion
about critical factors and potential interferences. Therefore, some conclusion and ideas can be
drawn from these trouble-shooting questions, which might help other researchers to develop more
reliable bioanalytical methods, or to raise their awareness of stumbling blocks along the way.