Results 301 to 310 of about 68,403 (337)

Isotope dilution analysis for speciation

Analytical and Bioanalytical Chemistry, 2003
The advantages of isotope dilution analysis for speciation in the metal species are described. The species-unspecific mode of different species provides accurate and precise determination of the element, because the quantification parameter is an isotope ratio, in spite of an absoluted intensity.
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Isotope Dilution Analysis

1971
This chapter describes the use of radioactive isotope dilution analysis in combination with various analytical separation techniques for the identification and quantitative determination of a labeled substance and its metabolite(s) in laboratory animals and man.
Anthony M. Guarino, Vincent T. Oliverio
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The assay of orotate by an isotope dilution procedure

Analytical Biochemistry, 1977
Abstract Orotate has been estimated by an isotope dilution procedure in which the sample of unlabeled orotate is competed with a known amount of [ 14 C]orotate for enzymatic reaction with a limiting amount of 5-phosphoribosyl-1-pyrophosphate. The dilution of the specific activity of the 14 C radioactivity in the orotidine-5′-monophosphate and UMP ...
Lloyd R. Finch, Richard I. Christopherson   +1 more
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The accuracy of isotope dilution methods

The International Journal of Applied Radiation and Isotopes, 1961
BS>The accuracy of quantitative analyses by various isotope dilution methods is discussed. The most favorable amounts of dilution are derived under the assumption that the relative error, delta S/S, in measuring a specific activity, S, is independent of S. (auth)
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A kinetic isotope dilution assay for glycerol

Analytical Biochemistry, 1984
Using glycerol kinase and [3H]glycerol, a kinetic isotope dilution assay for glycerol has been developed. Reactant and product are separated by stepwise elution from QAE-Sephadex. This assay is sensitive to as little as 100 pmol of glycerol, avoids numerous drawbacks of the traditional fluorescent assay, and readily detects glycerol production by fewer
Laurence L. Brunton, John Bell, Iain L. O. Buxton   +2 more
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Isotope dilution mass spectrometry

International Journal of Mass Spectrometry and Ion Processes, 1992
Abstract In the past isotope dilution mass spectrometry (IDMS) has usually been applied using the formation of positive thermal ions of metals. Especially in calibrating other analytical methods and for the certification of standard reference materials this type of IDMS became a routine method.
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Theoretical spectroscopy of isotopically dilute water and hydrophobicity

The Journal of Chemical Physics, 2020
Hydrophobic solutes significantly alter the water hydrogen bond network. The local alteration of solvation structures gets reflected in the vibrational spectroscopic signal. Although it is possible to detect this microscopic feature by modern infrared spectroscopy, bulk phase spectra often come with a formidable challenge of establishing the connection
Kambham Devendra Reddy, Rajib Biswas
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Determination of Oxygen in Titanium by Isotopic Dilution

Canadian Metallurgical Quarterly, 1966
AbstractTwo specimens of titanium which had been analyzed independently by vacuum fusion and inert-gas fusion were analyzed for oxygen by an isotope-dilution technique which employed a platinum bath and allowed the dilution to be followed with time. With graphite crucibles which had been degassed at 1850°C for 2 1/2 hours or longer, the exchange was ...
C.A. Collings, W.D. Jamieson, S.G. Whiteway, C. R. Masson   +3 more
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Isotope scrambling and error magnification in multiple-spiking isotope dilution

Analytical and Bioanalytical Chemistry, 2009
The purpose of performing multiple spiking isotope dilution is to quantify interconverting substances. This feature has been utilized in analytical chemistry now for more than a decade. In this manuscript we show that the interconversion of analytes is inevitably accompanied by the gradual loss of information that can be extracted from the isotope ...
Meija, Juris, Ouerdane, Laurent, Mester, Zoltán   +2 more
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Principles of Isotope Dilution Assays

Analytical Chemistry, 1957
Radioisotope dilution assay methods have attracted much attention since the first analytical symposium on this subject ten years ago. Isotope dilution assays of a wide variety of substances, including many biologically important substances such as vitamins, antibiotics, and insecticides, have been developed. An isotope dilution assay for vitamin B12 is
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