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Hepatic UDP-glucose 13C isotopomers from [U-13C]glucose: a simple analysis by 13C NMR of urinary menthol glucuronide
... Varian Unity 11.75T system equipped with a 5-mm broad- band probe. Spectra were obtained with a 60° pulse angle, an acquisition time of 2.5 s, a spectral width of 25 KHz (200 ppm), and a pulse delay of 0.5 s. NMR ...
Chemical constituents from simira glaziovii (K. schum) steyerm. and 1H and 13C NMR assignments of ophiorine and its derivatives.
... (d, 2,8 Hz)/7,80 (d, 2,8Hz)] (item b); d) os deslocamentos químicos e a multiplicidade dos sinais dos carbonos metínicos e metilênicos da unidade -glicopiranosídica revelaram-se compat[r] ...
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Characterization of organic matter in sediment cores of the Todos os Santos Bay, Bahia, Brazil, by elemental analysis and 13C NMR
... area, this depth corresponds to about 50 years ago, when the industrial activity started in the region. For core T4, there is no indication of a change in the sedimentation regime. Cores T5 and T6 show a distinct pattern ...
Complete Assignments of ¹H and 13C-NMR Spectra of the 3,4-seco-Triterpene Canaric Acid isolated from Rudgea jasminoides
... As a part of our study on the constituents of plants from Rubiaceae 2-5 , we report the isolation of the canaric acid 1 from the leaves of a specimen of R. jasminoides. The canaric acid is a rare seco-ring-A-triterpene ...
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Increase resolution of solution 13C NMR spectra of humic acids by previous treatment with 0,03 mol L-1 KCl.
... Este trabalho descreve um procedimento simples para me- lhorar a resolução de espectro de RMN 13 C de AH extraídos de resíduos orgânicos de origem urbana.. MATERIAIS E MÉTODOS.[r] ...
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Suppression of phase anomalies and sidebands on 13c NMR spectra obtained with the steady-state free precession sequence.
... A diferença é que nesta sequência os passos são constantes e não mais aleatórios, permitindo uma distribuição uni- forme destes valores na faixa de tempo estabelecida e, consequente- me[r] ...
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Synthesis and total 1H- and 13C-NMR assignment of cephem derivatives for use in ADEPT approaches
... A new cephalosporin carrier and a new correlated prodrug were successfully synthesized. The carrier itself is now available for use with a wide range of drugs. The preparation of the primaquine prodrug shows that several ...
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Análise do perfil de ácidos graxos no contra-filé bovino pela RMN de 13C em alta resolução.
... FAN, T. W-M.; CLIFFORD, A. J.; HIGASHI, R. M. In vivo 13C NMR analysis of acyl chain composition and organization of perirenal tryacylglycerides in rats fed vegetable and fish oils. J. Lipid Res., Bethesda, ...
Preparação e Estudo por STD-NMR de Sais Quaternários de Amónio
... The mechanism of interaction established between five quaternary ammonium salts synthesized and two standard proteins (lysozyme and RNase) were evaluated by Saturation Transfer Difference (STD) – NMR. The obtained ...
Convection In Liquid-state Nmr: Expect The Unexpected
... liquid NMR samples depends critically on experimental parameters such as sample size and shape, uid characteristics (viscosity, thermal conduc- tivity, thermal expansivity) and nominal sample temperature, but can ...
FFC NMR relaxometer with magnetic flux density control
... The core aspects of a main power source for an FFC NMR relaxometer are described and discussed in this paper. The implemented solution was designed specifically to directly control the magnetic flux density in the ...
A Validated NMR Approach for MDMA Quantification in Ecstasy Tablets
... of NMR to identify virtually any active substance of an illegal drug and to quantify it without using the standard of the target analyte are the major advantages of this technique when compared to the commonly ...
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Accurate, fully-automated NMR spectral profiling for metabolomics.
... pounds from the human CSF metabolome [38]. BAYESIL ’s biofluid-specific databases include es- sentially all NMR-detectable metabolites (with concentrations > 5 μM) in serum and CSF in healthy humans—i.e., for ...
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Simulation of NMR signals through the Bloch equations.
... OF NMR SIGNALS THROUGH THE BLOCH ...Many NMR pulse sequences can be simulated with this formalism, allowing a quantitative description of the influence of many experimental ...
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An NMR structural study of nickel-substituted rubredoxin
... When NMR is applied to paramagnetic metallopro- teins, a number of problems can be encountered, includ- ing large hyperfine shifts and extensive line broadening which can result in loss of NMR signals close ...
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Simulation of complex splittings of 1H NMR spectra.
... H.; NMR Spectroscopy, An Introduction, John Wiley & Sons: New York, 1987; Friebolin, ...Dimensional NMR Spectroscopy, VCH: Weinheim, 1991; Gil, ...
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Biosynthetic origin of acetic acid using SNIF-NMR.
... isso, tornou-se necessária a implementação de uma técnica para superar essa dificuldade e a SNIF-NMR veio suprimir essa lacuna. No presente trabalho descrevemos o uso da técnica SNIF-NMR no estudo da origem ...
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Avaliação através do teste respiratório com 13c ácido octanóico e 13c ácido acético dos efeitos da colecistectomia laparoscópica sobre oesvaziamento gástrico de sólidos e semi sólidos em portadores de colecistolitíase associada a sintomas dispépticos.
... Nas tabelas 11 e 12 estão representadas as médias (com dp) e medianas das variáveis tlag e t1/2 dos tempos de esvaziamento gástrico de sólidos e semi-sólidos, no pós- opera[r] ...
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13C e a Dinâmica do carbono orgânico do solo em Pastagem cultivada no Pantanal Sul-mato-grossense.
... introdução da pastagem aumentou 55% para a camada de 0-40 cm, após 20 anos de cultivo, sendo que 29% do carbono do solo, na camada 0-20 cm, foi originário da vegetação nativa.. A incorp[r] ...
Análise quantitativa dos teores de lignina e celulose em materiais de biomassa por RMN de 13C no estado sólido.
... O método previamente discutido de quanti cação dos teores de lignina e celulose foi então aplicado às amostras de bagaço de cana submetidas ao tratamento ácido; os resultados estão apres[r] ...