Development of a Selective ESI-MS Derivatization Reagent: Synthesis and Optimization for the Analysis of Aldehydes in Biological Mixtures
作者:Mark Eggink、Maikel Wijtmans、Reggy Ekkebus、Henk Lingeman、Iwan J. P. de Esch、Jeroen Kool、Wilfried M. A. Niessen、Hubertus Irth
DOI:10.1021/ac801429w
日期:2008.12.1
for the quantification of aldehydes in biological matrixes with positive ESI-MS/ MS without additional extraction procedures. 4-APC possesses an aniline moiety for a fast selective reaction with aliphaticaldehydes as well as a quaternary ammonium group for improved MS sensitivity. The derivatization reaction is a convenient one-pot reaction at a mild pH (5.7) and temperature (10 degrees C). As a result
IN-VITRO DIAGNOSIS OF HISTAMINE INTOLERANCE SYNDROME
申请人:Immundiagnostik AG
公开号:EP4103946A1
公开(公告)日:2022-12-21
[EN] IN-VITRO DIAGNOSIS OF HISTAMINE INTOLERANCE SYNDROME<br/>[FR] DIAGNOSTIC IN VITRO DU SYNDROME D'INTOLÉRANCE À L'HISTAMINE
申请人:IMMUNDIAGNOSTIK AG
公开号:WO2021160696A1
公开(公告)日:2021-08-19
A method of diagnosis of histamine intolerance in a person suspected of suffering from histamine intolerance syndrome. Isotope-labeled histamine metabolites, namely imidazole acetic acid and methylimidazole acetic acid are identified and measured in serum, plasma, urine and other bodily fluids following derivatization with a hydrazinoquinoline derivatization agent using the LC-MS/MS technique. The method and analytical technique is very sensitive and allows a safe use of an isotope-labeled oral histamine load as well as time-dependent measurements of the total activity of secreted and membrane-associated DAO enzymes for the sake of a differential diagnosis of histamine intolerance syndrome compared to food allergy, food hypersensitivity or food intolerance.
Derivatization of Methylglyoxal for LC-ESI-MS Analysis—Stability and Relative Sensitivity of Different Derivatives
employed reagents and 14 similar reagents, three of which were designed and synthesized by us. All reagents were probed for analytical responsiveness of the derivatives and stability of the reaction mixtures. The results showed that derivatives of 4-methoxyphenylenediamine and 3-methoxyphenylhydrazine—reported here for the first time for derivatization of RCCs—provided a particularly high responsiveness