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2 edition of gas chromatographic - Mass fragmentographic measurement of thyronine in human urine. found in the catalog.

gas chromatographic - Mass fragmentographic measurement of thyronine in human urine.

Paul Graham Willetts

gas chromatographic - Mass fragmentographic measurement of thyronine in human urine.

by Paul Graham Willetts

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Published by University of Birmingham in Birmingham .
Written in English


Edition Notes

Thesis (Ph.D.) - University of Birmingham, Dept of Medicine.

ID Numbers
Open LibraryOL13795771M

Comparison of two validated gas-chromatographic methods Ni63; a Hewlett Packard integrator, model and a 6 feet glass column (2 mm id), packed with 10% esqualane in Chromossorb WAW ( mesh) were used for method A. A Varian gas-chromatograph, model Star CX, equipped with a Tremetrics electrolytic conductivity. 7. High-performance Liquid Chromatography (HPLC) While there are many analytical instruments found in the typical chemical laboratory, perhaps the most common and most flexible is the HPLC. Based on the principle of chromatographic separation, HPLCs are used to determine the composition of complex.

A sensitive method for the determination of 3α,5β-tetrahydroaldosterone (THALD) in human urine is described. The method uses high-performance liquid chromatography with chemiluminescence detection. Urinary THALD, released by enzyme hydrolysis, is isolated and concentrated using a Sephadex GM column and Bond-ElutCited by: Gas chromatography-mass spectrometry (GS-MS) in combination with multivariate statistical analysis was applied to explore the metabolic variability in urine of chronically hydrogen sulfide- (H 2 S-) poisoned rats relative to control ones. The changes in endogenous metabolites were studied by partial least squares-discriminate analysis (PLS-DA) and independent-samples Cited by: 6.

  Thyroid hormones (THs) play critical roles in the regulation of growth and development, including brain development, in both humans and animals. Until recently, TH levels were assayed with measurements in serum, using immunoassay (IA)-based methods. IA methods are sensitive but are compromised by the lack of adequate specificity. Furthermore, Cited by: made with the urine of rats fed with cystine and the dismutation product of cystamine disulfoxide by H$, showed that compound 3 and the thiosulfonate derivative produced in the dismutation reaction exhibited identical chromatographic behavior. Pure crystalline thiotaurine was prepared as follows. A solu-.


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Gas chromatographic - Mass fragmentographic measurement of thyronine in human urine by Paul Graham Willetts Download PDF EPUB FB2

Journal of Chromatography, () Biomedical Applications Elsevier Science Publishers B.V., Amsterdam - Printed in The Netherlands CHROMBIO. IMPROVED GAS CHROMATOGRAPHIC-MASS FRAGMENTOGRAPHIC ASSAY FOR TETRAHYDROALDOSTERONE AND ALDOSTERONE IN URINE* B.J.

KOOPMAN*, IJ.G. Cited by: Download full text in PDF Download. ShareCited by: The direct combination of a time-of-flight mass spectrometer, which scans a mass range from m/e = 1 to m/e = at the rate of times per second, with a.

The procedure involves adsorption of the low-molecular-weight urinary metabolites on a porous polymer of 2,6-diphenyl-p-phenylene oxide (Tenax GC), gas-chromatographic separation, mass spectrometric identification, and mass fragmentographic representation of Cited by: Gas chromatography-mass spectrometry measurement of 6beta-OH-cortisol/cortisol ratio in human urine: a specific marker of enzymatic induction.

Luceri F(1), Fattori S, Luceri C, Zorn M, Mannaioni P, Messeri by: Define gas chromatography. gas chromatography synonyms, gas chromatography pronunciation, gas chromatography translation, English dictionary definition of gas chromatography.

gas and water measurement and control provider, has acquired the gas chromatography assets from SLS Micro Technology (SLS), a private company based in Hamburg, Germany.

/ Urinary testosterone measurement by gas chromatography after solid-phase extraction and high-performance liquid chromatography. In: Journal of Chromatography B: Biomedical Sciences and Applications. ; Vol.No. Cited by: 7. Gas Chromatographic-Mass Fragmentographic Quantitation of 3a-Hydroxy-k-pregnanone (Allopregnanolone) and Its Precursors in Blood and Brain of Adrenalectomized and.

Gas Chromatography-Mass Spectrometry (or GC/MS) is a two-step methodology used to identify different substances within a test sample. GC/MS is widely used due to its ability to perform a specific test, and is an extremely effective in identifying the presence of a specific substance within a given sample.

Quantitative Analysis of Hydrocortisone in Human Urine Using a High-Performance Liquid Chromatographic-Tandem Mass Spectrometric-Atmospheric-Pressure Chemical Ionization Method A.-E.F.

Nassar Bioanalytical R&D Department, Forest Laboratories, by:   In the present study, these metabolites for the fluorine-containing pyrethroids could be measured with the LOQs of – μg/L in human urine samples, in which matrix compounds were different from those in the urine of rats, by preparing finally to times their concentrations in the urine samples and by optimizing the temperature Cited by: 3.

Peat J., Garg U. () Determination of Tetrahydrozoline in Urine and Blood Using Gas Chromatography-Mass Spectrometry (GC-MS).

In: Garg U., Hammett-Stabler C. (eds) Clinical Applications of Mass Spectrometry. Methods in Molecular Biology (Methods and Protocols), vol Humana Press.

First Online 30 October Cited by: 7. Gas chromatography/mass spectrometry (GC/MS) is a fundamental tool used to identify impurities throughout the active pharmaceutical ingredients development process. The coupling of Orbitrap mass spectrometry with GC marks an exciting advance in capability for GC/MS, offering a significant step change in resolving power, mass accuracy.

Applications of high-resolution gas chromatography and high-resolution mass spectrometry (GC-MS) for identification and quantitation of trace amounts of pyrethroid metabolites in human urine samples are demonstrated. The method covers the pyrethroid metabolitescis- andtrans(2,2-dichlorovinyl)-2,2-dimethyl-cyclopropane carboxylic acid (cis- Cited by: Gas Chromatography and Mass Spectrometry: A Practical Guide - Kindle edition by Kitson, Fulton G., Larsen, Barbara S., McEwen, Charles N.

Download it once and read it on your Kindle device, PC, phones or tablets. Use features like bookmarks, note taking and highlighting while reading Gas Chromatography and Mass Spectrometry: A Practical Guide.4/4(2). What do you use to measure trace amounts of chemicals in the air.

A very powerful and sensitive instrument used to study trace amounts of chemicals in the air is a gas chromatograph (crow-MAT-oh-graf) connected to a mass spectrometer (spek-TRO-meh-ter), or GCMS. The GCMS can detect chemicals in amounts as small as a picogram.

That is gram. hormones and related compounds in filtered and unfiltered water by solid-phase extraction, derivatization, and gas. chromatography with tandem mass spectrometry: U.S.

Geological Survey Techniques and Methods, book 5, chap. B9, p. Electronic versions of the preparatory and analytical standard operating procedures for the methods are availableCited by: Gas chromatography (GC) can be divided into two categories: (1) gas-solid and (2) gas-liquid chromatography.

Gas-liquid GC, developed inis the primary GC technique used for environmental applications. Gas-solid GC is not widely used in the environmental field. A method for the analysis of thyroxine in human serum, utilising ‘exact matching’ isotope dilution mass spectrometry (IDMS) in combination with liquid chromatography/tandem mass spectrometry (LC/MS/MS), has been developed with a limit of quantification of ng g −1 of thyroxine in human serum.

The extraction and clean‐up of thyroxine. Isotope ratio mass spectrometers (IRMS) are highly extended from 13C and 15N analyses to allow measurement of 18O/16O (Fig. 2c, ) and D/H (Fig. 2d, ) of O- n Hyphenation of gas chromatographic techniques with isotope ratio mass spectrometry: Present status and future.

Gas Chromatography Mass Spectrometry. Gas spectrometry-mass spectrometry is a combination of both the process of GC and MS. Its purpose is to separate the chemical elements of a certain compound and identify the molecular level component.

In the process, the mixture will be heated in order to separate the elements.Gas Chromatography in the Analysis of Steroid Hormones Paperback – Decem by Herbert H.

Wotiz (Author), Stanley J. Clark (Author) See all 5 formats and editions Hide other formats and editions. Price New from Used from Hardcover Author: Herbert H.

Wotiz, Stanley J. Clark.Determination of six thyroid hormones in the brain and thyroid gland using isotope-dilution liquid chromatography/tandem mass spectrometry. [Tatsuya Kunisue, Jeffrey W Fisher, Kurunthachalam Kannan] PMID