Zobrazeno 1 - 10
of 145
pro vyhledávání: '"Nel H, Velthorst"'
Autor:
Gerard J. Stroomberg, Cornelis A.M. van Gestel, Nel H. Velthorst, Nico M. van Straalen, Bert van Hattum, Freek Ariese
Publikováno v:
Stroomberg, G, Ariese, F, van Gestel, C A, van Hattum, A G M, Velthorst, N H & Straalen, N M 2003, ' Pyrene biotransformation products as biomarkers of polycyclic aromatic hydrocarbon exposure in terrestrial Isopoda: concentration-response relationship, and field study in a contaminated forest ', Environmental Toxicology and Chemistry, vol. 22, no. 1, pp. 224-31 . https://doi.org/10.1897/1551-5028(2003)022<0224:PBPABO>2.0.CO;2
Environmental Toxicology and Chemistry, 22(1), 224-31. John Wiley and Sons Ltd
Environmental Toxicology and Chemistry, 22(1), 224-31. John Wiley and Sons Ltd
In this study, biotransformation products of pyrene were measured in the hepatopancreas of terrestrial isopods as biomarkers of polycyclic aromatic hydrocarbon (PAH) exposure. These products--pyrene-1-glucoside, pyrene-1-sulfate, an unknown pyrene co
Publikováno v:
de Beer, T, Velthorst, N H, Brinkman, U A T & Gooijer, C 2002, ' Laser-based non-fluorescence detection techniques for liquid separation systems ', Journal of Chromatography A, vol. 971, no. 1-2, pp. 1-35 . https://doi.org/10.1016/S0021-9673(02)01038-5
Journal of Chromatography A, 971(1-2), 1-35. Elsevier
Journal of Chromatography A, 971(1-2), 1-35. Elsevier
Over the last two decades, the possibility to use lasers for detection purposes in column liquid chromatography (LC) and capillary electrophoresis (CE) received much attention in the analytical chemistry literature. Most attention has been devoted to
Autor:
Cees Gooijer, Gerard Ph. Hoornweg, Tjipke de Beer, Udo A. Th. Brinkman, Freek Ariese, Nel H. Velthorst
Publikováno v:
de Beer, T, Hoornweg, G P, Ariese, F, Velthorst, N H, Brinkman, U A T & Gooijer, C 2000, ' On the potential of forward-scattering degenerate four-wave mixing detection in capillary electrophoresis ', Analytica Chimica Acta, vol. 416, no. 2, pp. 151-155 . https://doi.org/10.1016/S0003-2670(00)00907-7
Analytica Chimica Acta, 416(2), 151-155. Elsevier
Analytica Chimica Acta, 416(2), 151-155. Elsevier
The question is addressed, whether in capillary electrophoresis (CE) the laser-based forward degenerate four-wave mixing (F-D4WM) detection method can become a realistic alternative to conventional ultraviolet (UV) absorption detection. In order to a
Publikováno v:
Analytica Chimica Acta, 405, 1-7. Elsevier
Analytica Chimica Acta, 405(1-2), 1-7. Elsevier
Kok, S J, Evertsen, R, Velthorst, N H, Brinkman, U A T & Gooijer, C 2000, ' On the coupling of fluorescence line-narrowing spectroscopy and poly(ethylene)imine-cellulose thin-layer chromatography ', Analytica Chimica Acta, vol. 405, pp. 1-7 . https://doi.org/10.1016/S0003-2670(99)00698-4
Analytica Chimica Acta, 405(1-2), 1-7. Elsevier
Kok, S J, Evertsen, R, Velthorst, N H, Brinkman, U A T & Gooijer, C 2000, ' On the coupling of fluorescence line-narrowing spectroscopy and poly(ethylene)imine-cellulose thin-layer chromatography ', Analytica Chimica Acta, vol. 405, pp. 1-7 . https://doi.org/10.1016/S0003-2670(99)00698-4
The feasibility of a direct coupling of the low-temperature, high-resolution, fluorescence line-narrowing spectroscopy (FLNS) technique and the autoradiographic 32 P -post-labelling technique for DNA adducts is explored. FLNS has been used to identif
Autor:
Joop de Knecht, Freek Ariese, Gerard J. Stroomberg, Cornelis A.M. van Gestel, Nel H. Velthorst
Publikováno v:
Environmental Toxicology and Chemistry. 18:2217-2224
The object of this study was to investigate the formation of pyrene metabolites by the isopod Porcellio scaber as a possible tool in the environmental risk assessment of polycyclic aromatic hydrocarbon (PAH) exposure in terrestrial ecosystems. The fo
Publikováno v:
Veraart, J R, Groot, M C E, Gooijer, C, Lingeman, H, Velthorst, N H & Brinkman, U A T 1999, '
dialysis-SPE-CE of acidic drugs in biological samples. ', Analyst, vol. 124, pp. 115-118 . https://doi.org/10.1039/a807636g
Analyst, 124, 115-118
Analyst, 124, 115-118. Royal Society of Chemistry
dialysis-SPE-CE of acidic drugs in biological samples. ', Analyst, vol. 124, pp. 115-118 . https://doi.org/10.1039/a807636g
Analyst, 124, 115-118
Analyst, 124, 115-118. Royal Society of Chemistry
A fully automated method is presented for the determination of acidic drugs in urine and serum using on-line dialysis-solid-phase extraction (SPE)-capillary electrophoresis (CE) with UV detection. With non-steroidal anti-inflammatory drugs (NSAIDs) a
Autor:
Martin Sarobe, Igor Kozin, Leonardus W. Jenneskens, Nel H. Velthorst, Cees Gooijer, Edward J. Vlietstra
Publikováno v:
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 54:1443-1449
The high resolution Sphol'skii fluorescence spectrum of the non-alternant polycyclic aromatic hydrocarbon cyclopenta[c,d]pyrene (CPP, 1) in an n-hexane matrix at cryogenic temperature is reported. Two distinct narrow spectral lines at 378.0 and 379.6
Autor:
Tjipke de Beer, Arjan T. Termaten, Nel H. Velthorst, Cees Gooijer, Udo A. Th. Brinkman, Gerard Ph. Hoornweg
Publikováno v:
Journal of Chromatography A. 811:35-45
The feasibility of forward-scattering degenerate four-wave mixing (F-D4WM) for detection in micro-column (internal diameter 0.3 mm) liquid chromatography (micro-LC) is studied, using the separation of 1-amino-9,10-anthraquinone (I-AAQ) and 2-amino-9,
Autor:
Steven J. Kok, Gerard Ph. Hoornweg, Ton de Ridder, Cees Gooijer, Udo A. Th. Brinkman, Nel H. Velthorst
Publikováno v:
Journal of Chromatography A, 806, 355-360. Elsevier
Kok, S J, de Ridder, T, Brinkman, U A T, Velthorst, N H, Gooijer, C & Hoornweg, G P 1998, ' Generation of 275.4-nm UV output from a large-frame argon-ion laser for fluorescence detection in capillary electrophoresis. ', Journal of Chromatography A, vol. 806, pp. 355-360 . https://doi.org/10.1016/S0021-9673(98)00078-8
Kok, S J, de Ridder, T, Brinkman, U A T, Velthorst, N H, Gooijer, C & Hoornweg, G P 1998, ' Generation of 275.4-nm UV output from a large-frame argon-ion laser for fluorescence detection in capillary electrophoresis. ', Journal of Chromatography A, vol. 806, pp. 355-360 . https://doi.org/10.1016/S0021-9673(98)00078-8
A standard, relatively old, large-frame argon-ion laser, which is available in many laboratories, was modified to produce output in the deep-UV (275–306 nm) region by installing a set of inexpensive, commercially available laser mirrors. The deep-U
Publikováno v:
Journal of Pharmaceutical and Biomedical Analysis, 17, 1161-1166. Elsevier
Veraart, J R, Gooijer, C, Lingeman, H, Velthorst, N H & Brinkman, U A T 1998, ' Determination of phenprocoumon in plasma and urine using at-line solid-phase extraction-capillary electrophoresis. ', Journal of Pharmaceutical and Biomedical Analysis, vol. 17, pp. 1161-1166 . https://doi.org/10.1016/S0731-7085(98)00082-X
Veraart, J R, Gooijer, C, Lingeman, H, Velthorst, N H & Brinkman, U A T 1998, ' Determination of phenprocoumon in plasma and urine using at-line solid-phase extraction-capillary electrophoresis. ', Journal of Pharmaceutical and Biomedical Analysis, vol. 17, pp. 1161-1166 . https://doi.org/10.1016/S0731-7085(98)00082-X
The use of capillary electrophoresis (CE) for the analysis of biological samples is rather problematic because of the large number of interferences present in the matrix. One of the possibilities to solve such problems is to couple solid-phase extrac