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Coulier, L. (author), Bas, R. (author), Hekman, M. (author), van der Werff, B.J.C. (author), Burgering, M. (author), Thissen, U. (author)An ion-pair LC-ESI-MS method was developed capable of analyzing various reported umami or umami-enhancing compounds, including glutamic acid and 5'-ribonucleotides. The method was validated using tomato and potato samples and showed overall good analytical performance with respect to selectivity, detection limit, linearity, and repeatability....article 2011
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van Ginneken, V.J.T. (author), Verheij, E. (author), Hekman, M. (author), van der Greef, J. (author), Feskens, E.J.M. (author), Poelmann, R.E. (author)We investigated with LC-MS techniques, measuring approximately 109 lipid compounds, in mouse brain and liver tissue after 48 hours of starvation and a High-Fat Diet if brain and liver lipid composition changed. We measured Cholesterolesters (ChE), Lysophosphatidyl-cholines (LPC), Phosphatidylcholine (PC), Sphingomyelin (SPM) and Triacylglycerols...bookPart 2011
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- Bobeldijk-Pastorova, I. (author), Muilwijk, B. (author), Kramer, J. (author), Hekman, M. (author), Tummers, P. (author), Boon, P. (author), Lith, A. (author), van Veen, J.J.F. (author) conference paper 2011
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Bobeldijk, I. (author), Hekman, M. (author), van der Vries de- Weij, J. (author), Coulier, L. (author), Ramaker, R. (author), Kleemann, R. (author), Kooistra, T. (author), Rubingh, C. (author), Freidig, A. (author), Verheij, E. (author), TNO Kwaliteit van Leven (author)We report a sensitive, generic method for quantitative profiling of bile acids and other endogenous metabolites in small quantities of various biological fluids and tissues. The method is based on a straightforward sample preparation, separation by reversed-phase high performance liquid-chromatography mass spectrometry (HPLC-MS) and electrospray...article 2008
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Bobeldijk, I. (author), Karlsson, D. (author), Pronk, A. (author), Gonsalves, J. (author), Hekman, M. (author), van de Lagemaat, D. (author), Preller, L. (author), Heederik, D. (author), Skarping, G. (author), TNO Kwaliteit van Leven (author)An adapted method for the quantitative determination of isocyanates in air was implemented and validated in-house. The method was based on air sampling using an impinger flask containing di-n-butylamine (DBA) in toluene and a glass fibre filter in series. The DBA derivatives were determined using liquid chromatography and tandem mass...article 2008