Searched for: subject%3A%22Chromatography%252C%255C%2BLiquid%22
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Streekstra, E.J. (author), Russel, F.G.M. (author), van de Steeg, E. (author), de Wildt, S.N. (author)
Drug disposition in children is different compared to adults. Growth and developmental change the processes involved in drug disposition and efficacy, including membrane transporters and drug metabolizing enzymes, but for many of these proteins, the exact changes have not been fully elucidated to date. Quantitative proteomics offers a solution...
article 2021
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Balvers, M.G.J. (author), Verhoeckx, K.C.M. (author), Witkamp, R.F. (author), TNO Kwaliteit van Leven (author)
A sensitive and specific LC-MS/MS method for the quantification of the endocannabinoids and related structures anandamide, 2-arachidonoyl glycerol, 2-arachidonyl glycerol ether, O-arachidonoyl ethanolamide, dihomo-γ-linolenoyl ethanolamide, docosatetraenoyl ethanolamide, N-arachidonoyl dopamine, N-arachidonyl glycine, N-oleoyl dopamine, oleoyl...
article 2009
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Wang, J. (author), van der Heijden, R. (author), Spijksma, G. (author), Reijmers, T. (author), Wang, M. (author), Xu, G. (author), Hankemeier, T. (author), van der Greef, J. (author), TNO Kwaliteit van Leven (author)
A matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS) method was developed for the high throughput and robust qualitative profiling of alkaloids in Fuzi-the processed lateral roots of the Chinese herbal medicine Aconitum carmichaeli Debx (A. carmichaeli). After optimization, powdered roots - without any further sample...
article 2009
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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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Hu, C. (author), van Dommelen, J. (author), van der Heijden, R. (author), Spijksma, G. (author), Reijmers, T.H. (author), Wang, M. (author), Slee, E. (author), Lu, X. (author), Xu, G. (author), van der Greef, J. (author), Hankemeier, T. (author), TNO Kwaliteit van Leven (author)
A reversed-phase liquid chromatography-linear ion trap-Fourier transform ion cyclotron resonance-mass spectrometry method was developed for the profiling of lipids in human and mouse plasma. With the use of a fused-core C<sub>8</sub> column and a binary gradient, more than 160 lipids belonging to eight different classes were detected in a single...
article 2008
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Bergheanu, S.C. (author), Reijmers, T. (author), Zwinderman, A.H. (author), Bobeldijk, I. (author), Ramaker, R. (author), Liem, A.-H. (author), van der Greef, J. (author), Hankemeier, T. (author), Jukema, J.W. (author), TNO Kwaliteit van Leven (author)
Objective: Lipid profiling (lipidomics) may be useful in revealing detailed information with regard to the effects on lipid metabolism, the cardiovascular risk and to differentiate between therapies. The aims of the present study were to: (1) analyze in depth the lipid changes induced by rosuvastatin and atorvastatin at different dosages; (2)...
article 2008
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Bansal, S. (author), Gaspari, M. (author), Raj, H.G. (author), Kumar, A. (author), Cuda, G. (author), Verheij, E. (author), Tyagi, Y.K. (author), Ponnan, P. (author), Rastogi, R.C. (author), Parmar, V.S. (author), TNO Kwaliteit van Leven (author)
Our earlier investigations identified acetoxy drug: protein transacetylase (TAase), a unique enzyme in the endoplasmic reticulum (ER) catalyzing the transfer of acetyl groups from polyphenolic acetates (PA) to certain functional proteins. Recently we have established the identity of TAase with ER protein calreticulin (CR) and subsequently...
article 2008
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Steeneken, P.A.M. (author), Tas, A.C. (author), Woortman, A.J.J. (author), Sanders, P. (author), Mijland, P.J.H.C. (author), de Weijs, L.G.R. (author), TNO Kwaliteit van Leven (author)
The effect of the granule structure on the methylation of starch was investigated by comparing the substitution patterns of potato starch methylated in granular suspension and in solution to DS 0.3. Substitution patterns were analyzed by successive digestion with α-amylase and amyloglucosidase, fractionation of the resulting malto...
article 2008
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TNO Kwaliteit van Leven (author), Draisma, H.H.M. (author), Reijmers, T.H. (author), Bobeldijk-Pastorova, I. (author), Meulman, J.J. (author), van Estourgie-Burk, G.F. (author), Bartels, M. (author), Ramaker, R. (author), van der Greef, J. (author), Boomsma, D.I. (author), Hankemeier, T. (author)
Differences in genetic background and/or environmental exposure among individuals are expected to give rise to differences in measurable characteristics, or phenotypes. Consequently, genetic resemblance and similarities in environment should manifest as similarities in phenotypes. The metabolome reflects many of the system properties, and is...
article 2008
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Damsten, M.C. (author), Commandeur, J.N.M. (author), Fidder, A. (author), Hulst, A.G. (author), Touw, D. (author), Noort, D. (author), Vermeulen, N.P.E. (author), TNO Defensie en Veiligheid (author)
Covalent binding of reactive electrophilic intermediates to proteins is considered to play an important role in the processes leading to adverse drug reactions and idiosyncratic drug reactions. Consequently, both for the discovery and the development of new drugs, there is a great interest in sensitive methodologies that enable the detection of...
article 2007
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Koster, S. (author), Verpoorte, E. (author), TNO Kwaliteit van Leven (author)
This review presents a thorough overview covering the period 1997-2006 of microfluidic chips coupled to mass spectrometry through an electrospray interface. The different types of fabrication processes and materials used to fabricate these chips throughout this period are discussed. Three 'eras' of interfaces are clearly distinguished. The...
article 2007
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Mol, H.G.J. (author), Rooseboom, A. (author), van Dam, R. (author), Roding, M. (author), Arondeus, K. (author), Sunarto, S. (author), TNO Kwaliteit van Leven (author)
The ethyl acetate-based multi-residue method for determination of pesticide residues in produce has been modified for gas chromatographic (GC) analysis by implementation of dispersive solid-phase extraction (using primary-secondary amine and graphitized carbon black) and large-volume (20 μL) injection. The same extract, before clean-up and after...
article 2007
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Nielen, M.W.F. (author), van Engelen, M.C. (author), Zuiderent, R. (author), Ramaker, R. (author), TNO Kwaliteit van Leven (author)
An emerging trend is recognised in hormone and veterinary drug residue analysis from liquid chromatography tandem mass spectrometry (LC/MS/MS) based screening and confirmation towards accurate mass alternatives such as LC coupled with time-of-flight (TOF), Fourier transform ion cyclotron resonance (FTICR) or Fourier transform orbitrap (FT...
article 2007
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Werf, M.J.v.d. (author), Overkamp, K.M. (author), Muilwijk, B. (author), Coulier, L. (author), Hankemeier, T. (author), TNO Kwaliteit van Leven (author)
Achieving metabolome data with satisfactory coverage is a formidable challenge in metabolomics because metabolites are a chemically highly diverse group of compounds. Here we present a strategy for the development of an advanced analytical platform that allows the comprehensive analysis of microbial metabolomes. Our approach started with in...
article 2007
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Buscher, B.A.P. (author), Gerritsen, H. (author), van Schöll, I. (author), Cnubben, N.H.P. (author), Brüll, L.P. (author), TNO Kwaliteit van Leven (author)
An LC-MS/MS method has been developed for the quantitative determination of a protein drug (Tenecteplase; MW 58,777 Da) in rat plasma. The protein was digested with trypsin without prior clean-up of the plasma sample, without the use of a label nor internal standard. A limited validation was performed to assess the linearity, the sensitivity and...
article 2007
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Kamphorst, J.J. (author), van der Heijden, R. (author), de Groot, J. (author), Lafeber, F.P.J.G. (author), Reijmers, T.H. (author), van El, B. (author), Tjaden, U.R. (author), van der Greef, J. (author), Hankemeier, T. (author), TNO Kwaliteit van Leven (author)
Synovial fluid potentially contains markers for early diagnosis and disease progression in degenerative joint diseases such as osteoarthritis. Here, a method is described for profiling endogenous peptides in human synovial fluid, using ultrafiltration, solid-phase extraction, nanoscale liquid chromatography, and high-resolution mass spectrometry...
article 2007
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Cawello, W. (author), Wolff, H.M. (author), Meuling, W.J.A. (author), Horstmann, R. (author), Braun, M. (author), TNO Kwaliteit van Leven (author)
Background and objective: The dopamine agonist rotigotine has been formulated in a silicone-based transdermal system for once-daily administration. The objective of the present study was to characterise the mass balance of rotigotine in humans after administration of a single transdermal patch containing radiolabelled [14C]rotigotine and to...
article 2007
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Noort, D. (author), Fidder, A. (author), van der Schans, M.J. (author), Hulst, A.G. (author), TNO Defensie en Veiligheid (author)
We present a generic mass spectrometric method to verify exposure to organophosphates, based on the chemical conversion of the phosphylated peptides obtained after pepsin digestion of human butyrylcholinesterase (HuBuChE) to a common precursor peptide. After exposure of plasma to various organophosphates (nerve agents, pesticides), HuBuChE was...
article 2006
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Coulier, L. (author), Bas, R. (author), Jespersen, S. (author), Verheij, E. (author), van der Werf, M.J. (author), Hankemeier, T. (author), TNO Kwaliteit van Leven TNO Voeding (author)
We have developed an analytical method, consisting of ion-pair liquid chromatography coupled to electrospray ionization mass spectrometry (IP-LC-ESI-MS), for the simultaneous quantitative analysis of several key classes of polar metabolites, like nucleotides, coenzyme A esters, sugar nucleotides, and sugar bisphosphates. The use of the ion-pair...
article 2006
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Gaspari, M. (author), Verhoeckx, K.C.M. (author), Verheij, E.R. (author), van der Greef, J. (author), TNO Kwaliteit van Leven (author)
LC-MS-based proteomics requires methods with high peak capacity and a high degree of automation, integrated with data-handling tools able to cope with the massive data produced and able to quantitatively compare them. This paper describes an off-line two-dimensional (2D) LC-MS method and its integration with software tools for data preprocessing...
article 2006
Searched for: subject%3A%22Chromatography%252C%255C%2BLiquid%22
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