Results 1 to 10 of about 179,183 (161)

Scientific Opinion on re-evaluation of one flavouring substance 3-acetyl-2,5-dimethylthiophene [FL-no 15.024] from FGE.19 subgroup 5.2 [PDF]

EFSA Journal, 2013
The 26th Plenary meeting of the AFC Panel on 27-29 November 2007 discussed the flavouring group evaluation 19 (FGE.19) which included alpha, beta-unsaturated aldehydes or ketones considered to be a structural alert for genotoxicity.
EFSA Panel on Food Contact Materials, Enzymes, Flavourings and Processing Aids (CEF)
doaj   +1 more source

Scientific Opinion on Flavouring Group Evaluation 217, Revision 1 (FGE.217Rev1). Consideration of genotoxic potential for ?,?-unsaturated ketones and precursors from chemical subgroup 4.1 of FGE.19: Lactones [PDF]

EFSA Journal, 2013
The Panel on Food Contact Materials, Enzymes, Flavourings and Processing Aids of the European Food Safety Authority was requested to evaluate the genotoxic potential of 12 flavouring substances from subgroup 4.1 of FGE.19 in the Flavouring Group ...
EFSA Panel on Food Contact Materials, Enzymes, Flavourings and Processing Aids (CEF)
doaj   +1 more source

Scientific Opinion on Flavouring Group Evaluation 216, Revision 1 (FGE.216Rev1). Consideration of genotoxic potential for ?,?-unsaturated 2-Phenyl -2-Alkenals from Subgroup 3.3 of FGE.19 [PDF]

EFSA Journal, 2013
The Panel on Food Contact Materials, Enzymes, Flavourings and Processing Aids of the European Food Safety Authority was requested to evaluate the genotoxic potential of five flavouring substances from subgroup 3.3 of FGE.19.
EFSA Panel on Food Contact Materials, Enzymes, Flavourings and Processing Aids (CEF)
doaj   +1 more source

High-field NMR spectroscopy and FTICR mass spectrometry: powerful discovery tools for the molecular level characterization of marine dissolved organic matter [PDF]

Biogeosciences, 2013
High-performance, non-target, high-resolution organic structural spectroscopy was applied to solid phase extracted marine dissolved organic matter (SPE-DOM) isolated from four different depths in the open South Atlantic Ocean off the Angola coast (3° E ...
N. Hertkorn, M. Harir, B. P. Koch, B. Michalke, P. Schmitt-Kopplin   +4 more
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Oxidative Asymmetric Formal Aza-Diels–Alder Reactions of Tetrahydro-β-carboline with Enones in the Synthesis of Indoloquinolizidine-2-ones

Molecules, 2018
Ru-catalyzed tandem amine oxidative dehydrogenation/formal aza-Diels–Alder reaction for enantio- and diastereoselective synthesis of indoloquinolizidine-2-ones from tetrahydro-β-carbolines and α,β-unsaturated ketones is described ...
Xiang Wu, Shi-Bao Zhao, Lang-Lang Zheng, You-Gui Li   +3 more
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Highly enantioselective michael addition of cyclic 1,3-dicarbonyl compounds to alpha,beta-unsaturated ketones.

Organic Letters, 2007
[reaction: see text] The highly enantioselective Michael addition of 1,3-cyclic dicarbonyl compounds to alpha,beta-unsaturated ketones was reported to be catalyzed by an organic primary amine derived from quinine.
Jianhua Xie, L. Yue, Wei Chen, Wei Du, Jin Zhu, Jin-gen Deng, Yingchun Chen   +6 more
semanticscholar   +1 more source

Inserção de catalisador híbrido na síntese de beta-tiocetonas

Orbital: The Electronic Journal of Chemistry, 2012
The Michael reaction (or Michael addition) involves the addition of a nucleophile, called Michael donor, to an electrophile (α,β-unsaturated), called Michael acceptor. Literature reports several types of nucleophiles applied in this reaction.
Mariana Pompilio Darbem, Andrelson Wellington Rinaldi, Nelson Luis C. Domingues   +2 more
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SYNTHESIS AND IN VITRO ANTIFUNGAL ACTIVITIES OF .ALPHA., .BETA.-UNSATURATED KETONES AS ANALOGUES OF KAKUOL

, 2017
– As a part of our ongoing program for the development of analogues of kakuol d rugs, 27 α, β -unsaturated ketones compounds with a terminal C=C bond, were synthesized and characterized by spectroscopic analysis.
Guoqing Sui, Jianjun Sun, Yang Li, Z. Wen, Z. Kun, Bing Zhang, Li Yulin, Guangci Liu, Wenming Zhou   +8 more
semanticscholar   +1 more source

Scientific Opinion on Flavouring Group Evaluation 217 Revision 2 (FGE.217Rev2), consideration of genotoxic potential for α,β‐unsaturated ketones and precursors from chemical subgroup 4.1 of FGE.19: lactones

EFSA Journal, 2019
The Panel on Food Additives and Flavourings of the European Food Safety Authority was requested to evaluate the genotoxic potential of 12 flavouring substances from subgroup 4.1 of FGE.19 in the Flavouring Group Evaluation 217 (FGE.217).
EFSA Panel on Food Additives and Flavourings (FAF), Maged Younes, Gabriele Aquilina, Laurence Castle, Karl‐Heinz Engel, Paul Fowler, Maria Jose Frutos Fernandez, Peter Fürst, Ursula Gundert‐Remy, Rainer Gürtler, Trine Husøy, Peter Moldeus, Agneta Oskarsson, Romina Shah, Ine Waalkens‐Berendsen, Detlef Wölfle, Romualdo Benigni, Claudia Bolognesi, Kevin Chipman, Eugenia Cordelli, Gisela Degen, Daniel Marzin, Camilla Svendsen, Maria Carfì, Giorgia Vianello, Wim Mennes   +25 more
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Distribution of lipid biomarkers and carbon isotope fractionation in contrasting trophic environments of the South East Pacific [PDF]

Biogeosciences, 2008
The distribution of lipid biomarkers and their stable carbon isotope composition was investigated on suspended particles from different contrasting trophic environments at six sites in the South East Pacific. High algal biomass with diatom-related lipids
I. Tolosa, J.-C. Miquel, B. Gasser, P. Raimbault, C. Goyet, H. Claustre   +5 more
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