Results 231 to 240 of about 1,079,697 (312)

Quantitative 1H NMR spectroscopy

TrAC Trends in Analytical Chemistry, 2012
Abstract This review illustrates the need to use nuclear magnetic resonance (NMR) spectroscopy for the quantitative analysis of small molecules in their crude forms and in mixtures. We provide the basic concepts of quantitative NMR (qNMR), a brief description of important acquisition and processing parameters responsible for obtaining high-quality ...
Santosh Kumar Bharti, Raja Roy
openaire   +2 more sources

Application of 1H NMR in the study of fatty acids composition of vegetable oils.

Journal of Pharmaceutical and Biomedical Analysis, 2022
The fatty acid composition is a parameter that determines the quality and origin of vegetable oils. The standard method used in the analysis of fatty acid composition is gas chromatography (GC). In the last 20 years, however, the 1H NMR method has become
Paweł Siudem, A. Zielińska, K. Paradowska   +2 more
semanticscholar   +1 more source

Refining Universal Procedures for Ammonium Quantification via Rapid 1H NMR Analysis for Dinitrogen Reduction Studies

, 2020
As research on sustainable ammonia synthesis via electrochemical and photochemical N2 reduction progresses to include a wider variety of aqueous and aprotic electrolytes, 1H NMR spectroscopy is inc...
Rebecca Y. Hodgetts, A. Kiryutin, P. Nichols, H. Du, Jacinta M. Bakker, D. Macfarlane, A. Simonov   +6 more
semanticscholar   +1 more source

Characterization of heroin samples by 1H NMR and 2D DOSY 1H NMR

Forensic Science International, 2014
Twenty-four samples of heroin from different illicit drug seizures were analyzed using proton Nuclear Magnetic Resonance ((1)H NMR) and two-dimensional diffusion-ordered spectroscopy (2D DOSY) (1)H NMR. A careful assignment and quantification of (1)H signals enabled a comprehensive characterization of the substances present in the samples investigated:
Stéphane, Balayssac, Emmanuel, Retailleau, Geneviève, Bertrand, Marie-Pierre, Escot, Robert, Martino, Myriam, Malet-Martino, Véronique, Gilard   +6 more
openaire   +2 more sources

1H‐NMR Microscopy of Tablets *

Journal of Pharmaceutical Sciences, 1995
A 1H-nuclear magnetic resonance (NMR) microscopy method was utilized for the first time to determine the porosity distribution of physically intact tablets. The main advantage of this newly developed method was that porosity cross sections through whole tablets or specific locations could be obtained without mechanically destroying the tested tablet ...
G, Nebgen, D, Gross, V, Lehmann, F, Müller   +3 more
openaire   +2 more sources

1H NMR-based metabolic characterization of Chinese Wuding chicken meat.

Food Chemistry, 2019
The aim of this study was to evaluate the chemical composition of precursor flavor substance of Wuding chicken with the age of 110, 140, 170, 200 and 230 days. The metabolic composition of chicken meat was studied using 1H nuclear magnetic resonance (NMR)
Zhichao Xiao, C. Ge, G. Zhou, Wangang Zhang, G. Liao   +4 more
semanticscholar   +1 more source

1H NMR combined with PLS for the rapid determination of squalene and sterols in vegetable oils.

Food Chemistry, 2019
Proton nuclear magnetic resonance (1H NMR) combined with partial least squares (PLS) was developed for the rapid determination of squalene and sterols (brassicasterol, campesterol, stigmasterol and β-sitosterol) in 119 vegetable oils from 7 different ...
Tingting Shi, Mengting Zhu, Xingyu Zhou, Xi Huo, You Long, Xian-Yu Zeng, Yi Chen   +6 more
semanticscholar   +1 more source

1H-NMR-Spektroskopie

Spektroskopische Daten zur Strukturaufklärung organischer Verbindungen, 2001
Ernö Pretsch, Philippe Bühlmann, Christian Affolter, Martin Badertscher   +3 more
openaire   +2 more sources

1H NMR-based fingerprinting of eleven Mexican Capsicum annuum cultivars.

Food Research International, 2019
Approximately 90% of the chili peppers consumed in the world are harvested in Mexico. The present article describes the untargeted 1H NMR-based metabolomic profiling of 11 cultivars of Capsicum annuum species which are routinely consumed worldwide.
Elideth Florentino-Ramos, N. Villa‐Ruano, Diego Hidalgo-Martínez, Moisés Ramírez-Meraz, R. Méndez-Aguilar, R. Velásquez-Valle, L. G. Zepeda-Vallejo, Nury Pérez-Hernández, Elvia Becerra-Martínez   +8 more
semanticscholar   +1 more source

1H NMR-based metabolomics and lipidomics of microalgae

Trends in Plant Science, 2021
[No abstract available]
Manisha Nanda, Vinod Kumar, Neha Arora, Mikhail S. Vlaskin, Manoj K. Tripathi   +4 more
openaire   +3 more sources