Results 61 to 70 of about 37,929 (259)

Sonocatalytic carbon dioxide reduction for syngas production over surface‐roughened CuxO catalyst

AIChE Journal, EarlyView.
Abstract The transition to a carbon‐circular economy requires efficient technologies for converting CO2 into value‐added chemical feedstocks. Sonocatalytic CO2 conversion has recently emerged as a compelling approach to drive this conversion. Here, we report a surface‐roughened CuxO catalyst for sonocatalytic CO2 reduction in aqueous media, achieving a
Dong Xia, Yi Qin, Hessan Khalid, Yagya N. Regmi, Laurie A. King, James Kwan   +5 more
wiley   +1 more source

The Essential Oil of (Beck) K. Malý

Natural Product Communications, 2009
Essential oil of Thymus aureopunctatus (Beck) K. Malý, obtained by hydrodistillation and headspace technique, was subjected to capillary GC-MS analysis, and its volatile composition was compared with essential oil profile of Thymus serpyllum L.
Sanja Ćavar, Milka Maksimović, Danijela Vidic   +2 more
doaj   +1 more source

Effects of Different Methods of Isolation on Volatile Composition of Artemisia annua L.

International Journal of Analytical Chemistry, 2018
In order to determine influence of extraction method on volatile oil composition of Artemisia annua L., steam distillation, hydrodistillation, organic solvent extraction, and headspace sampling have been applied.
Danijela Vidic, Amira Čopra-Janićijević, Mladen Miloš, Milka Maksimović   +3 more
doaj   +1 more source

Improved analysis of propylene oxide, propylene chlorohydrin and propylene bromohydrin

Julius-Kühn-Archiv, 2018
The benefits and deficiencies of several methods of analysis for PPO and PXH, including the aqueous extraction used in ASTA method 23.1 and the MTBE extraction method previously reported by the authors, will be discussed.
Hall, Wiley A., Walse, Spencer S., Jimenez, Leonel   +2 more
doaj   +1 more source

Headspace analysis of the volatile oils of Agastache

Journal of Agricultural and Food Chemistry, 1992
Equilibrium headspace analysis in combination with gas chromatography/mass spectroscopy was used to identify volatile compounds released by the inflorescences and leaves from individual plants of Agastache foeniculum, Agastache rugosa, and putative hybrids. Methylchavicol was the major constituent in most populations tested. The inflorescences produced
Wilson, Lester, Senechal, Neil, Widrlechner, Mark   +2 more
openaire   +3 more sources

Comparative Chemical Analysis of and and a Fast Assessment of Commercial Peppermint Teas

Natural Product Communications, 2016
The hydrodistilled essential oils and volatile compounds (by static headspaces technique) of Mentha piperita L. and M. spicata L. were characterized by GC-MS.
Mihaela Buleandra, Eliza Oprea, Dana Elena Popa, Iulia Gabriela David, Zenovia Moldovan, Iuliana Mihai, Irinel Adriana Badea   +6 more
doaj   +1 more source

Comparative Analysis of Headspace Volatiles of Chinese Rosa rugosa

Molecules, 2010
The floral headspace compounds of Chinese Rosa rugosa germplasms that were isolated by an automated headspace sampler with built-in trap, and followed by gas chromatography-mass spectrometry for identification and quantification.
Lan-Yong Zhao, Ping Liu, Jun Tao, Jia-Le Su, Chen Chen, Li-Xia Sheng, Li-Guo Feng   +6 more
doaj   +1 more source

Analysis of Extractives in Liquid and Headspace Samples of Silver Fir Using Gas Chromatography Coupled with a Mass Selective Detector

Drvna Industrija
The main objective of the study is to present a chromatographic method that allows rapid and accurate quality control of extractives in liquid and headspace samples of wood and bark of European silver fir (Abies alba Mill.).
Viljem Vek, Ida Poljanšek, Urša Osolnik, Primož Oven   +3 more
doaj   +1 more source

Monitoring of oxygen in the gas and liquide phases of bottles of wine at bottling and during storage

OENO One, 2006
The assaying of oxygen in the headspace of a bottle combined with that of dissolved oxygen in the wine makes it possible to obtain the total oxygen per bottle.
Jean-Claude Vidal, Michel Moutounet
doaj   +1 more source

Stabilization of PUFA‐Rich Mayonnaise Against Lipid Oxidation: A Review of the Last Three Decades of Research

Journal of the American Oil Chemists' Society, EarlyView.
ABSTRACT Mayonnaise, a widely consumed oil‐in‐water emulsion, is highly susceptible to lipid oxidation due to its high content of polyunsaturated fatty acids (PUFAs) and the presence of pro‐oxidant factors such as low pH and iron from egg yolk. Over the past three decades, extensive research has focused on understanding oxidation mechanisms, analytical
Sakhi Ghelichi, Betül Yesiltas, Charlotte Jacobsen   +2 more
wiley   +1 more source