Compositional studies of an asphalt and its molecular distillation fractions by nuclear magnetic resonance and infrared spectrometry

1968 ◽  
Vol 40 (7) ◽  
pp. 1100-1103 ◽  
Author(s):  
R. V. Helm ◽  
J. C. Petersen
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Molecular Distillation ◽  
Infrared Spectrometry ◽  
Nuclear Magnetic

scholarly journals Study of the Structure of 1, 3-Diketone-isoniazid Hydrazone Metal Complexes with Nuclear Magnetic Resonance and Infrared Spectrometry

1970 ◽  
Vol 90 (8) ◽  
pp. 955-966 ◽  
Author(s):  
TAKEICHI SAKAGUCHI ◽  
TOSHIO ARIGA ◽  
TOMOKO YOSHIDA ◽  
YOKO NISHINO ◽  
YOSHINAGA SHIRAI
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Metal Complexes ◽  
Infrared Spectrometry ◽  
Nuclear Magnetic

Investigation of the Chemical Structure of Coal by Nuclear Magnetic Resonance and Infrared Spectrometry

1977 ◽  
Vol 31 (2) ◽  
pp. 116-121 ◽  
Author(s):  
H. L. Retcofsky
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
High Resolution ◽  
Aromatic Ring ◽  
Structural Parameters ◽  
Spectral Studies ◽  
Infrared Spectrometry ◽  
Magnetic Resonance Data ◽  
Average Size ◽  
Nuclear Magnetic

The distributions of hydrogen and carbon among various organic structures in solvent extracts of selected coals have been determined by high-resolution proton and carbon-13 magnetic resonance spectrometry. Structural parameters including the aromaticity, the degree of aromatic ring substitution, and the average size of the condensed aromatic ring system have been deduced for each extract using the nuclear magnetic resonance data in conjunction with the elemental analysis of the material. Complementary infrared spectral studies of the extracts and their parent coals have been used to estimate the aromaticities of whole coals. The potential of two other magnetic resonance techniques, proton-enhanced nuclear induction spectroscopy and proton-decoupled high-resolution carbon-13 magnetic resonance, in coal research is discussed. The results of the present investigation are in accord with commonly held views of coal metamorphism; they do not, however, support recent reports challenging the classical view that coals arc highly aromatic materials.

scholarly journals Nuclear Magnetic Resonance and Headspace Solid-Phase Microextraction Gas Chromatography as Complementary Methods for the Analysis of Beer Samples

2016 ◽  
Author(s):  
Sarah R. Johnson ◽  
Samantha E. Soprano ◽  
Laura M. Wickham ◽  
Neil Fitzgerald ◽  
John C. Edwards
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Gas Chromatography ◽  
Magnetic Resonance ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Gas Chromatography Mass Spectrometry ◽  
Infrared Spectrometry ◽  
Headspace Solid Phase Microextraction ◽  
Organic Components ◽  
Nuclear Magnetic

Chemical analysis of the organic components in beers has applications to quality control, authenticity and improvements to the flavor characteristics and brewing process. This study aims to show the complementary nature of two instrumental techniques which in combination can identify and quantify the majority of organic components in a beer sample. Nuclear Magnetic Resonance (NMR) was used to provide concentrations of twenty five different organic compounds including alcohols, organic acids, carbohydrates, and amino acids. Calorie content was also estimated for the samples. NMR data for ethanol concentrations were validated by comparison to a Fourier Transform Infrared Spectrometry (FTIR) method. Headspace Solid-Phase Microextraction (SPME) Gas Chromatography Mass Spectrometry (GCMS) was used to identify a range of volatile compounds such as alcohols, esters and hop derived aroma compounds. A simple and inexpensive conversion of a Gas Chromatography Flame Ionization Detector (GC FID) instrument to allow the use of Solid-Phase Microextraction was found to be useful for the quantification of volatile esters.

scholarly journals Comprehensive Characterization of Linalool-HP-β-Cyclodextrin Inclusion Complexes

Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 5069 ◽  
Author(s):  
María Isabel Rodríguez-López ◽  
María Teresa Mercader-Ros ◽  
Carmen Lucas-Abellán ◽  
José Antonio Pellicer ◽  
Alfonso Pérez-Garrido ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Inclusion Complexes ◽  
Reaction Medium ◽  
Solid Inclusion ◽  
Infrared Spectrometry ◽  
Scanning Calorimetry ◽  
1H Nuclear Magnetic Resonance ◽  
Solid Complexes ◽  
Nuclear Magnetic

The objective of the present study is to obtain linalool- cyclodextrin (CDs) solid complexes for possible applications in the food industry. For this purpose, a detailed study of linalool complexation was carried out at different pH values, to optimize the type of CDs and reaction medium that support the highest quantity of encapsulated linalool. Once demonstrated the ability of hydroxypropyl-β-cyclodextrin (HP-β-CDs), to form inclusion complexes with linalool (KC = 921 ± 21 L mol−1) and given their greater complexation efficacy (6.788) at neutral pH, HP-β-CDs were selected to produce solid inclusion complexes by using two different energy sources, ultrasounds and microwave irradiation, subsequently spraying the solutions obtained in the Spray Dryer. To provide scientific solidity to the experimental results, the complexes obtained were characterized by using different instrumental techniques in order to confirm the inclusion of linalool in the HP-β-CDs hydrophobic cavity. The linalool solid complexes obtained were characterized by using 1H nuclear magnetic resonance (1H-NMR) and 2D nuclear magnetic resonance (ROSEY), differential scanning calorimetry, thermogravimetry and Fourier transform infrared spectrometry. Moreover, the structure of the complex obtained were also characterized by molecular modeling.

An emerging technology: Nuclear magnetic resonance microscopy

1988 ◽  
Vol 46 ◽  
pp. 1000-1001
Author(s):  
M.J. Hennessy ◽  
E. Kwok
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Relaxation Times ◽  
Basic Research ◽  
Local Environment ◽  
Magnetic Resonance Images ◽  
Nmr Microscopy ◽  
Mri Scans ◽  
Temperature Relaxation ◽  
Nuclear Magnetic

Much progress in nuclear magnetic resonance microscope has been made in the last few years as a result of improved instrumentation and techniques being made available through basic research in magnetic resonance imaging (MRI) technologies for medicine. Nuclear magnetic resonance (NMR) was first observed in the hydrogen nucleus in water by Bloch, Purcell and Pound over 40 years ago. Today, in medicine, virtually all commercial MRI scans are made of water bound in tissue. This is also true for NMR microscopy, which has focussed mainly on biological applications. The reason water is the favored molecule for NMR is because water is,the most abundant molecule in biology. It is also the most NMR sensitive having the largest nuclear magnetic moment and having reasonable room temperature relaxation times (from 10 ms to 3 sec). The contrast seen in magnetic resonance images is due mostly to distribution of water relaxation times in sample which are extremely sensitive to the local environment.

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