Zobrazeno 1 - 10
of 436
pro vyhledávání: '"R.A. de Zeeuw"'
Publikováno v:
Journal of Lipid Research, Vol 11, Iss 4, Pp 376-377 (1970)
By vapor-programmed thin-layer chromatography on silica gel, it was possible to separate cholestanol from cholesterol and stigmastanol from β-sitosterol. The method was applied for the analysis of β-sitosterol-3-14C.
Externí odkaz:
https://doaj.org/article/09d79214f28848ba997c75988624fdaa
Autor:
R.A. de Zeeuw, H.A.G. Niederländer, A. P. Bruins, G.J. de Jong, Corry M. Hofland, M.W.J van Hout
Publikováno v:
Journal of Chromatography B. 794:185-192
Solid-phase extraction (SPE) was directly coupled to mass spectrometry (MS) to assess the feasibility of the system for the rapid determination of prednisolone in serum. A C18 stationary phase allowed washing of the cartridge with 25% methanol. Eluti
Publikováno v:
Chromatographia, 57(3-4), 221-225
Solid-phase extraction (SPE) was combined with thermal desorption (TD) and gas chromatographic (GC) analysis to determine drugs in urine. The extraction was performed inside a fritted GC liner using about 5 mg TENAX that was inserted into the liner o
Publikováno v:
Rapid Communications in Mass Spectrometry. 17:245-250
Ion suppression effects were observed during the determination of clenbuterol in urine with solid-phase extraction/multiple-stage ion-trap mass spectrometry (SPE/MS(3)), despite the use of atmospheric pressure chemical ionisation. During SPE, a polym
Publikováno v:
Journal of Chromatography B-Analytical Technologies in the Biomedical and Life Sciences, 766(1), 37-45. ELSEVIER SCIENCE BV
Solid-phase extraction-pipette tips (SPE-PTs) were used for micro solid-phase extraction of lidocaine and diazepam from plasma. Off-line extraction was followed by on-line desorption. On-line desorption was carried out by direct coupling of the SPE-P
Publikováno v:
Journal of Analytical Toxicology, 26(1), 48-51. Oxford University Press
Broad-spectrum drug screening is frequently applied inforensic and clinical toxicology, drugs and driving and doping,for example. It requires that all toxicologically relevant sub-stances be isolated, detected, and identified, regardless theirstructu
Publikováno v:
Journal of Analytical Toxicology, 24(2), 97-101. Oxford University Press
Broad-spectrum drug screening requires that all relevant substances be isolated, detected, and identified, regardless of their structure and/or polarity. To this end, systematic solid-phase extraction (SPE) approaches for drug isolation from biologic
Publikováno v:
Journal of Chromatography B, 739(1), 125-137
The ultimate goal in qualitative analysis in the biosciences is tb demonstrate with acceptable probability that for an unknown constituent in a sample only one substance comes into consideration and that all other substances can be rejected. In the b
Publikováno v:
Journal of Pharmaceutical and Biomedical Analysis, 753-761. ELSEVIER SCIENCE BV
STARTPAGE=753;ENDPAGE=761;ISSN=1873-264X;TITLE=Journal of Pharmaceutical and Biomedical Analysis
STARTPAGE=753;ENDPAGE=761;ISSN=1873-264X;TITLE=Journal of Pharmaceutical and Biomedical Analysis
In this article, an improved benzodiazepine radioreceptor assay is described, which allows substantial reduction in assay time, The filtration in this method was performed by using the MultiScreen(R) Assay System. The latter consists of a 96-well pla
Publikováno v:
Journal of Chromatography B, 729(1-2), 199-210
The use of a programmed temperature vaporiser (PTV) with a packed liner was evaluated for the injection of large volumes (up to 100 mu l) of plasma extracts in a gas chromatograph. Solvent purity, which is essential when large volumes are injected in