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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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Kerkdijk, H. (author), Mol, H.G.J. (author), van der Nagel, B. (author), TNO Kwaliteit van Leven (author)A new concept for cleanup, based on volume overloading of the cleanup column, has been developed for on-line coupling of gel permeation chromatography (GPC), solid-phase extraction (SPE), or both, to gas chromatography (GC). The principle is outlined and the applicability demonstrated by the determination of pesticide residues in food matrixes...article 2007
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- Butler Ellis, M.C. (author), Herbst, A. (author), Kudsk, P. (author), Lane, A.G. (author), Miller, P.C.H. (author), Milligan, A.L. (author), Mol, H.G.J. (author), Nicholls, J.W. (author), North, M. (author), Nuyttens, D. (author), Parkin, C.S. (author), Powell, E.S. (author), Robinson, T.H. (author), de Ruiter, H. (author), Webb, D.A. (author), van de Zande, J.C. (author), TNO Voeding TNO Industrie Centraal Instituut voor Voedingsonderzoek TNO (author) article 2004
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- Mol, H.G.J. (author), van Dam, R.C.J. (author), TNO Voeding (author) article 2003
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- Mol, H.G.J. (author), TNO Voeding (author) article 2003
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Mol, H.G.J. (author), van Dam, R.C.J. (author), Steijger, O.M. (author), TNO Voeding (author)A method based on liquid chromatography (LC)-mass spectrometry (MS)/MS was developed for sensitive determination of a number of less gas chromatography (GC)-amenable organophosphorus pesticides (OPs; acephate, methamidophos, monocrotophos, omethoate, oxydemeton-methyl and vamidothion) in cabbage and grapes. For extraction, several solvents were...article 2003
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- Mol, H.G.J. (author), Pranoto-Soetardhi, L.A. (author), van Dijk, T.G. (author), de Ruiter, H. (author), TNO Voeding (author) conference paper 2001
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Ingelse, B.A. (author), van Dam, R.C.J. (author), Vreeken, R.J. (author), Mol, H.G.J. (author), Steijger, O.M. (author), TNO Voeding Centraal Instituut voor Voedingsonderzoek TNO (author)It was demonstrated that four out of six of the very polar organophosphorus pesticides (OPs), i.e. acephate, methamidophos, monocrotophos, omethoate, oxydemeton-methyl and vamidothion, could not be extracted from water using commonly available SPE cartridges. In addition, GC analysis on all six compounds was found to be troublesome due to their...article 2001
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Mol, H.G.J. (author), van Dam, R.C.J. (author), Vreeken, R.J. (author), Steijger, O.M. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)A straightforward and reliable method was developed for the determination of chlormequat in pears by liquid chromatography/mass spectrometry (LC/MS). Water and methanol were compared as extraction solvents. Because no significant differences in extraction efficiency or repeatability were found, water was chosen as the extraction solvent. The...article 2000
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Centraal Instituut voor Voedingsonderzoek TNO TNO Voeding (author), Mol, H.G.J. (author), Sunarto, S. (author), Steijger, O.M. (author)The combined gas chromatographic determination of a number of hydroxyl-group containing endocrine disruptors, including 4-octylphenol, 4-nonylphenol, 2,4-dichlorophenol, pentachlorophenol, 4-tert.-butylbenzoic acid, bisphenol-A, 17?-estradiol and 17?-ethynylestradiol, was investigated. Derivatization, required for sensitive determination of...article 2000
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- Mol, H.G.J. (author), van Dam, R.C.J. (author), Vreeken, R.J. (author), Steijger, O.M. (author) article 1999
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Mol, H.G.J. (author), van Dam, R.C.J. (author), Vreeken, R.J. (author), Steijger, O.M. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)A straightforward and efficient method was developed for the determination of intact daminozide in apples and apple leaves. After extraction with methanol and a clean-up step using a graphitized carbon cartridge, the extract was analysed by ion-trap liquid chromatography-tandem mass spectrometry (LC-MS-MS) using atmospheric pressure chemical...article 1999
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- Mol, H.G.J. (author), Hankemeier, T. (author), Brinkman, U.A.T. (author), Centraal Instituut voor Voedingsonderzoek TNO (author) article 1999
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Mol, H.G.J. (author), Hankemeier, T. (author), Brinkman, U.A.T. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)This study describes the coupling of an atomic-emission detector and mass-spectrometric detector to a single gas chromatograph. Splitting of the column effluent enables simultaneous detection by atomic-emission detection (AED) and mass spectrometry (MS) and yields a powerful system for the target and non-target analysis of gas chromatography (GC...article 1999