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Start Over Author "Gooijer C" Publication Type Academic Journals
301 results on '"Gooijer C"'

5. Miniaturized cavity ring-down detection in a liquid flow cell

Author

Bahnev, B., van der Sneppen, L., Wiskerke, A.E., Ariese, F., Gooijer, C., and Ubachs, W.

Subjects
Liquid chromatography -- Research, Spectrum analysis -- Research, Chemistry, Analytic -- Research, Chemistry
Abstract

A novel method for applying cavity ring-down spectroscopy in the liquid phase, compatible with LC analyses, is presented. The core of the setup is a home-built cavity ring-down flow cell (cell volume 12 [micro]L) that is constructed using a silicon rubber spacer, which is clamped leak-tight between two high-reflectivity mirrors. The mirrors are in direct contact with the liquid flow, which provides for a small path length and short ring-down times. Inside the cavity there are no windows, reflection losses, or Brewster angles to be considered. Due to the small size of the presented cavity geometry, the setup can be implemented in conventional-size LC apparatuses. With a flow injection setup, a detection limit of 2.5 nM was obtained for Crystal Violet in ethanol, and the linear dynamic range of the system is at least 2 orders of magnitude. The method has the potential to become a powerful alternative for commercial LC UV/visible absorbance detectors.

Published
2005

8. Fluorescence of humic acids (HA) and pyrene-HA complexes at ultralow temperature

Author

Kumke, M.U., Frimmel, F.H., Ariese, F., and Gooijer, C.

Subjects
Humic acid -- Research, Environmental issues, Science and technology
Abstract

University researchers investigated the transformation of pyrene fluorescence spectra in the presence of humic acid at low temperatures using groundwater samples collected from Germany.

Published
2000

39. LBA92 - Switch maintenance gemcitabine after first-line chemotherapy in patients with malignant mesothelioma: A multicenter open label phase II trial (NVALT19)

Author

Burgers, S.A., de Gooijer, C., Cornelissen, R., Aerts, J.G., Biesma, B., Heemst, R.V., Youssef-El Soud, M., Groen, H.J.M., Staal-van den Brekel, A.J., Bootsma, G., Schijen, J H E M, Baas, P., Giovannetti, E., de Vries, J.F., Hogenboom, F.A., de Wit, D.C.M., Mahn- Schaefers, M.C.W., Lalezari, F., van de Noort, V., and Stigt, J.

Published
2019
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42. Abstracts of papers

Author

van Oort, W. J., Holthuis, J. J. M., de Vries, E. J., Noten, J. B. G. M., Labruyère, A. P., Brinkman, U. A. Th, Billiet, H. A. H., Laurent, C. J. C. M., de Galan, L., Hulshoff, A., Ensing, K., de Zeeuw, R. A., Leeuwenkamp, O. R., van der Mark, E. J., Jousma, H., van Bennekom, W. P., Bult, A., Onkenhout, W., van Bergen, E. J. C., van der Wart, J. H. F., Vermeulen, N. P. E., van der Klauw, P., Oosterhuis, B., Wetsteyn, J. C. F. M., van Boxtel, C. J., Klok, A., Kornblum, G. R., Vogelaar, E. F., Kok, W. Th, Frei, R. W., de Bree, H., van Amsterdam, P. H., van der Stel, D. J. K., Tulp, M. Th M., Vincent, W. R., de Zoeten, L. W., Ruyten, H. M., van Berkel, M. P., Bergsma, R. M., Bouma, P., Uges, D. R. A., Kolstee, H. J., Bloemhof, H., Vree, T. B., Tijhuis, M. W., Nouws, J. F. M., Hekster, Y. A., Barends, D. H., Blauw, J. S., Govers, C. J. L. R., van der Houwen, O. A. G. J., Indemans, A. W. M., Lingeman, H., Underberg, W. J. M., Renema, J., Holthuis, J. J. M., Vendrig, D. E. M., Lake, O. A., Underberg, W. J. M, Wilting, J., Beijnen, J. H., den Hartigh, J., Kootstra, P. R., de Ruiter, C., de Vries, J., Gooijer, C., Funke, C., van Doornum, E., van Dijck, L., van Leuken, M., van Hattem, R., van der Ven, C., Elferink, F., van der Vijgh, W. J. F., Pinedo, H. M., Jongen, M. J. M., Netelenbos, J. C., Lips, P., Debets, H. J. G., Weyland, J. W., and Doornbos, P. A.

Published
1983
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45. Erratum

Author

de Gooijer, C. D., van Lier, F. L. J., van den End, E. J., Vlak, J. M., and Tramper, J.

Published
1989
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47. Interfacing capillary electrophoresis and surface-enhanced resonance Raman spectroscopy for the determination of dye compounds.

Author

Román, D. Arráez, Efremov, E., Ariese, F., Carretero, A. Segura, and Gooijer, C.

Subjects
CAPILLARY electrophoresis, RAMAN spectroscopy, COLLOIDAL silver, RAMAN effect, THIN layer chromatography
Abstract

The at-line coupling of capillary electrophoresis (CE) and surface-enhanced resonance Raman spectroscopy (SERRS) was optimized for the separation and subsequent spectroscopic identification of charged analytes (dye compounds). Raman spectra were recorded following deposition of the electropherogram onto a moving substrate. To this end a new interface was developed using a stainless steel needle as a (grounded) cathode. The outlet end of the CE capillary was inserted into this metal needle; CE buffer touching the needle tip served as the electrical connection for the CE separation. A translation table was used to move the TLC plate at a constant speed during the deposition. The distance between the tip of the fused silica column and the TLC plate was kept as small as possible in order to establish a constant bridge-flow, while avoiding direct contact. The dyes Basic Red 9 (BR9), Acid Orange 7 (AO7) and Food Yellow 3 (FY3) were used as test compounds. After CE separation in a 20 mM borate buffer at pH 10, after deposition, concentrated silver colloid was added to each analyte spot, followed by irradiation with 514.5 nm light from an argon ion laser to record the SERRS signal using a Raman microscope. Different types of silver colloids were tested: Lee-Meisel type (citrate), borate, and gold-coated silver. BR9 (positively charged) gave much more intense SERRS spectra than the two negatively charged dyes. For BR9 and AO7 the citrate-coated Lee-Meisel colloid yielded the most intense SERRS spectra. The CE-SERRS system was used to separate and detect the negatively charged dyes. Silver colloid and nitric acid (to improve adsorption) were added post-deposition. Even though their chemical structures are very similar, AO7 and FY3 could be readily distinguished based on their SERRS spectra. The limits of detection (S/N=3) of the CE-SERRS system ranged from 6.7×10-5 M (2.6×10-12 mol injected) for FY3 down to 1.8×10-6 M (7.0×10-14 mol injected) for BR9. [ABSTRACT FROM AUTHOR]

Published
2005
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