Results 71 to 80 of about 179,472 (317)

Comparação de técnicas de determinação de ésteres em cachaça Comparison of esters determination techniques in cachaça

Química Nova, 2009
An analytical comparison of three different techniques for quantitative profile of esters in cachaça is reported. The Ministério da Agricultura Pecuária e Abastecimento (MAPA) recommends the use of GC/FID or volumetry. Despite being laborious and lacking
Eduardo S. P. Nascimento, Daniel R. Cardoso, Douglas W. Franco   +2 more
doaj   +1 more source

Optimization and validation for identification of volatile organic com-pounds released from Trogoderma variabile Ballion using headspace solid-phase microextraction and GC-FID/MS

Journal of Kerbala for Agricultural Sciences, 2023
Volatile organic compounds (VOC) emitted by Trogoderma variabile at different life stages (larvae, female and male) can help us to understand the chemical signals that are released by the beetle which can serve as biomarkers for diagnostic purpose. There are several factors that effect on the optimization of VOC extraction including, temperature, jar ...
Thamer Alshuwaili, Mushtak Talib Mohammedali, Adnan A. Lahuf, Pushpendra Koli, Manjree Agarwal   +4 more
openaire   +1 more source

Low‐Temperature Reverse Water–Gas Shift Enabled by Magnetically Induced Catalysis

Angewandte Chemie, EarlyView.
Magnetically induced catalysis using standard Cu–Al spinel‐derived catalyst functionalized with carbon‐coated iron nanoparticles enables high CO yield (up to 62%) at mild catalyst and reactor temperatures (estimated at 300°C and determined as 25–123°C, respectively).
Junhui Hu, Lise Marie Lacroix, Jacob Johny, Sourav Ghosh, Elisabeth Hannah Wolf, Jeongmin Ji, Sheng‐Hsiang Lin, Manisha Durai, Alin Benice Schöne, Walid Hetaba, Holger Ruland, Walter Leitner, Alexis Bordet   +12 more
wiley   +2 more sources

A comparison of new measurements of total monoterpene flux with improved measurements of speciated monoterpene flux [PDF]

Atmospheric Chemistry and Physics, 2005
Many monoterpenes have been identified in forest emissions using gas chromatography (GC). Until now, it has been impossible to determine whether all monoterpenes are appropriately measured using GC techniques.
A. Lee, G. W. Schade, R. Holzinger, A. H. Goldstein   +3 more
doaj  

Determination of Essential Oil Bioactive Components and Rosmarinic Acid of Salvia officinalis Cultivated under Different Intra-row Spacing

Notulae Scientia Biologicae, 2013
Salvia officinalis, known also as sage, is a medicinal plant belonging to the Lamiaceae family that spreads all over the word in several countries. The demand for the raw material and extracts of this plant is increasing due to its numerous applications ...
Mohammad ABU DARWISH, Ezz Al-Dein AL-RAMAMNEH, Ivan SALAMON, Ziad ABU-DIEYEH, Mohamed AL NAWAISEH, Tahani ALBDOUR   +5 more
doaj   +3 more sources

CO2 Reduction on Copper‐Nitrogen‐Doped Carbon Catalysts Tuned by Pulsed Potential Electrolysis: Effect of Pulse Potential

Advanced Functional Materials, EarlyView.
This study demonstrates that pulsed potential electrolysis significantly improves CO2 reduction performance on copper‐nitrogen doped carbon electrodes. The formation of cationic copper sites and metallic clusters as a function of applied intermittent potential leads to notable selectivity changes compared to potentiostatic reduction.
Dorottya Hursán, Janis Timoshenko, Andrea Martini, Hyo Sang Jeon, Eduardo Ortega, Martina Rüscher, Arno Bergmann, Aram Yoon, Uta Hejral, Antonia Herzog, Clara Rettenmaier, Felix T. Haase, Philipp Grosse, Beatriz Roldan Cuenya   +13 more
wiley   +1 more source

Dual Chemical Looping/Catalytic Process for Alkylation of Benzene With Ethane and Propane Yielding Ethylbenzene and Cumene Over Copper‐Containing Mordenite

Angewandte Chemie, EarlyView.
We report a dual chemical looping/catalytic process coupling alkane dehydrogenation with aromatic alkylation over Cu‐mordenite, yielding up to 25% alkylated aromatics with >95% selectivity per cycle. In situ NMR, FTIR spectroscopy, and DFT show alkylation proceeds via a π‐bound Cu(I)–olefin intermediate and Brønsted acid sites.
Florent J. Dubray, Yu‐Hsun Wang, Mikalai A. Artsiusheuski, Jiawei Guo, Rene Verel, Ambarish Kulkarni, Jeroen A. van Bokhoven, Vitaly L. Sushkevich   +7 more
wiley   +2 more sources

Dataset on lipid profile of bovine oocytes exposed to Lα-phosphatidylcholine during in vitro maturation investigated by MALDI mass spectrometry and gas chromatography-flame ionization detection

Data in Brief, 2017
Data presented in this article are related with the research article entitled “Effect of soybean phosphatidylcholine on lipid profile of bovine oocytes matured in vitro” [1].
Alessandra A. Vireque, Christina R. Ferreira, Rafael R. Hatanaka, Alessandra Tata, Katia Roberta A. Belaz, Vanessa G. Santos, Marcos N. Eberlin, Marcos Felipe Silva de Sá, Rui A. Ferriani, Ana Carolina J.S. Rosa e Silva   +9 more
doaj   +1 more source

Study on the content and profile of MOSH and MOAH in unprocessed meat by LC/GC × GC-FID/MS

Food Chemistry
Mineral oil hydrocarbons (MOH) contamination was evaluated in 30 samples of various unprocessed meats. Preliminary tests showed that a saponification method with a 2 M KOH solution was the most adequate for sample treatment for meat. Most of the meat samples showed saturated MOH (MOSH) in a carbon chain length range that could have accumulated by the ...
Paula Albendea, Giorgia Purcaro
openalex   +5 more sources

Analytical methods relevant to the European Commission's 2012 proposal on Priority Substances under the Water Framework Directive [PDF]

, 2012
This report collects information on chemical analytical methods for the analysis of the new proposed priority substances (PS) of the European Water Framework Directive (WFD) and some existing PS for which the Environmental Quality Standards (EQS) have ...
LOOS Robert
core   +1 more source