Complementary use of gas chromatography–mass spectrometry, gas chromatography–atomic emission detection and nuclear magnetic resonance for identification of pharmaceutically related impurities of unknown structures

2004 ◽  
Vol 1027 (1-2) ◽  
pp. 93-102 ◽  
Author(s):  
Krzysztof Łaniewski ◽  
Malin Vågerö ◽  
Egil Forsberg ◽  
Tobias Forngren ◽  
Gunnar Hagman
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Gas Chromatography ◽  
Magnetic Resonance ◽  
Atomic Emission ◽  
Gas Chromatography Mass Spectrometry ◽  
Related Impurities ◽  
Chromatography Mass Spectrometry ◽  
Atomic Emission Detection ◽  
Emission Detection

Comparison of hydrogenolysis with thioacidolysis for lignin structural analysis

Holzforschung ◽  
2014 ◽  
Vol 68 (2) ◽  
pp. 151-155 ◽  
Author(s):  
Daniel J. van de Pas ◽  
Bernadette Nanayakkara ◽  
Ian D. Suckling ◽  
Kirk M. Torr
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Gas Chromatography ◽  
Nmr Spectroscopy ◽  
Structural Analysis ◽  
Magnetic Resonance ◽  
Gas Chromatography Mass Spectrometry ◽  
Aryl Ether ◽  
Chromatography Mass Spectrometry

Abstract Mild hydrogenolysis has been compared with thioacidolysis as a method for degrading lignins in situ and in isolated form before analysis by gas chromatography/mass spectrometry and quantitative 31P nuclear magnetic resonance (NMR) spectroscopy. Both degradation methods gave similar levels of β-aryl ether-linked phenylpropane units that were released as monomers. Degradation by hydrogenolysis generally gave lower levels of total phenylpropane units when analyzed by 31P NMR, especially in the case of lignins with high levels of condensed units. Overall, these results indicate that mild hydrogenolysis could offer an alternative to thioacidolysis for probing lignin structure.

scholarly journals Chemical Composition of Needle, Cone, and Branch Oils From Vietnamese Pinus cernua

2019 ◽  
Vol 14 (5) ◽  
pp. 1934578X1985099 ◽  
Author(s):  
Tran Hui Thai ◽  
Nguyen Thi Hien ◽  
Le Ngoc Diep ◽  
Mathieu Paoli ◽  
Joseph Casanova ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Gas Chromatography ◽  
Chemical Composition ◽  
Magnetic Resonance ◽  
Retention Index ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
Main Component ◽  
Pine Species

Conifers are well represented in Vietnam where a new pine species has been recently discovered in Son La province: Pinus cernua, synonym P. armandii ssp. xuannhaensis. The compositions of needle, cone, and branch oils have been investigated by gas chromatography (retention index), gas chromatography-mass spectrometry, and 13C nuclear magnetic resonance. Myrcene (47.0%) was the main component of needle oil, followed by β-pinene (28.4%) and α-pinene (12.5%). Branch oil also contained myrcene (32.8%), α-pinene (17.9%), β-pinene (9.8%), and a high content of limonene (20.0%). Finally, cone oil displayed α-pinene (44.1%) beside myrcene (11.5%), β-pinene (8.1%), and limonene (5.8%).

scholarly journals Two Woody Scented Oils from the Amazonian Forest

2021 ◽  
Author(s):  
Eduardo Mattoso ◽  
Charlene dos Anjos ◽  
Lauro Barata ◽  
Anita Marsaioli
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Gas Chromatography ◽  
Magnetic Resonance ◽  
Essential Oils ◽  
Gas Chromatography Mass Spectrometry ◽  
Crude Oils ◽  
Amazonian Forest ◽  
Chromatography Mass Spectrometry ◽  
13C Nuclear Magnetic Resonance

The essential oils from Aniba parviflora and the balsam from Protium rubrum, which are two woody scented Amazonian species, were analyzed by gas chromatography-mass spectrometry (GC-MS), 1H and 13C nuclear magnetic resonance (NMR). GC-MS analysis revealed the presence of unknown constituents. These compounds were then isolated, analyzed and characterized by NMR. Both substances presented distinct woody notes that contributed to the bulk woody character of the crude oils.

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