Výsledky vyhledávání - "B.G. Wolthers"

Investigation of applicability of a mid-infrared spectroscopic method using an attenuated total reflection accessory and a new near-infrared transmission method for determination of faecal fat

Autor: Marcel Volmer, B.G. Wolthers, Anneke W. Kingma, Peter C F Borsboom, Ido P. Kema

Publikováno v: Annals of Clinical Biochemistry, 38, 256-263. SAGE Publications Inc.

In many laboratories, the titrimetric method of Van de Kamer is used for the analysis of faecal fat content of patients suspected of steatorrhoea. We investigated the applicability of a mid-infrared (MIR) spectroscopic method, using an attenuated tot

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::39e3993d0ebc0a82f2fdb6d6e5f413cd
https://doi.org/10.1258/0004563011900489

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Determination of urinary 18β-glycyrrhetinic acid by gas chromatography and its clinical application in man

Autor: Michael Kerstens, Robin P. F. Dullaart, B.G. Wolthers, J.C van der Molen, Cpf Guillaume

Publikováno v: Journal of Chromatography B: Biomedical Sciences and Applications. 731:323-334

A sensitive and quantitative gas chromatographic assay for the determination of 18 beta-glycyrrhetinic acid (18 beta-GA), the main metabolite of glycyrrhizin after oral licorice consumption in human urine, has been developed and validated. For the ex

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1d2be917598399682e1941c88956b5e5
https://doi.org/10.1016/s0378-4347(99)00239-x

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Clinical applications of gas chromatography and gas chromatography–mass spectrometry of steroids

Autor: B.G. Wolthers, G.P.B. Kraan

Publikováno v: Journal of Chromatography A. 843:247-274

This review article underlines the importance of gas chromatography-mass spectrometry (GC-MS) for determination of steroids in man. The use of steroids labelled with stable isotopes as internal standard and subsequent analysis by GC-MS yields up to n

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9dc4fc2836beb58f87888a5e5c4d3a5b
https://doi.org/10.1016/s0021-9673(99)00153-3

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The Daily Cortisol Production Reinvestigated in Healthy Men. The Serum and Urinary Cortisol Production Rates Are Not Significantly Different1

Autor: G.P.B. Kraan, Robin P. F. Dullaart, R. de Bruin, John J. Pratt, N.M. Drayer, B.G. Wolthers

Publikováno v: The Journal of Clinical Endocrinology & Metabolism. 83:1247-1252

We have measured the urinary cortisol production rate (uCPR) simultaneously with the serum cortisol production rate (sCPR) in four healthy men within a period of 3 days. uCPR, determined by isotope dilution of 11-oxoetiocholanolone was compared with

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b8ced86b02fd4eab86a1bbe195220704
https://doi.org/10.1210/jcem.83.4.4694

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Evaluation of urinary metanephrine and normetanephrine enzyme immunoassay (ELISA) kits by comparison with isotope dilution mass spectrometry

Autor: Marcel Volmer, Bernhard Manz, Reinhard Wesemann, Ido P. Kema, B.G. Wolthers, Jürgen Westermann

Publikováno v: Clinical Chemistry, 43(1), 114-120. AMER ASSOC CLINICAL CHEMISTRY

Determination of urinary 3-O-methylated catecholamines (metanephrines) is generally considered a principal test for the clinical chemical diagnosis of pheochromocytoma and is currently performed predominantly with chromatographic techniques such as g

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::49a91420a8bbe98c8d3f1cd3cc717cea
https://doi.org/10.1093/clinchem/43.1.114

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Urinary steroid profile of a newborn suffering from pseudohypoaldosteronism

Autor: C.W. Rouwe, J.C. van der Molen, F. Lenting, E.R. Boersma, G.T. Nagel, G.P.B. Kraan, B.G. Wolthers

Publikováno v: Clinica chimica acta, 236(1), 33-43. ELSEVIER SCIENCE BV

A case is described of a newborn, admitted to hospital because of severe salt loss at the age of 1 month. Subsequent analysis of urinary steroid excretion, by gas chromatography and gas chromatography-mass spectrometry, revealed that the patient suff

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9052a00cacd0cfefe70e6715701fc3fc
https://doi.org/10.1016/0009-8981(95)06034-7

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Synthesis and identification of twelve A-ring reduced 6α- and 6β-hydroxylated compounds derived from 11-deoxycortisol, corticosterone and 11-dehydrocorticosterone

Autor: J.C. van der Molen, R.W.J. Zijlstra, G.T. Nagel, J. Hartstra, N.M. Drayer, W.H. Kruizinga, G.P.B. Kraan, B.G. Wolthers

Publikováno v: The Journal of Steroid Biochemistry and Molecular Biology. 49:233-244

The synthesis and identification of 12 A-ring reduced 6 alpha-(and 6 beta-)hydroxylated compounds derived from 11-deoxycortisol (S), corticosterone (B) and 11-dehydrocorticosterone (A) are reported here. These steroids were prepared in two steps from

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bea629632c4640cc6e2341c839e6c5fe
https://doi.org/10.1016/0960-0760(94)90015-9

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Use of determinations of 7-lathosterol (5 alpha-cholest-7-en-3 beta-ol) and other cholesterol precursors in serum in the study and treatment of disturbances of sterol metabolism, particularly cerebrotendinous xanthomatosis

Autor: P.N. Wijnandts, J.C. van der Molen, H T Walrecht, B.G. Wolthers, J J Van Doormaal, G.T. Nagel

Publikováno v: Journal of Lipid Research, Vol 32, Iss 4, Pp 603-612 (1991)

The sterol composition of sera from patients with cerebrotendinous xanthomatosis (CTX) was investigated by gas chromatographic analysis of saponified extracts, using a polar (CP Wax 52CB) and an apolar (CP Sil 5CB) capillary column. Apart from alread

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::40a87c7d0e2f52f486a2a9560a4e76d2
http://www.sciencedirect.com/science/article/pii/S0022227520420474

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Evaluation of specific high-performance liquid-chromatographic determinations of urinary metanephrine and normetanephrine by comparison with isotope dilution mass spectrometry

Autor: J. J Willemsen, H A. Ross, B.G. Wolthers, Ido P. Kema, C.G.J. Sweep

Publikováno v: Annals of clinical biochemistry. 38(Pt 6)

A method for the determination of metanephrine (MN; also known as metadrenaline), normetanephrine (NMN; also known as normetadrenaline) and 3- methoxytyramine (3-MT) in human urine using high-performance liquid chromatography followed by electrochemi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::adbf47cbad8f15b5212e00f35ce4a389
https://pubmed.ncbi.nlm.nih.gov/11471877

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