The Experts below are selected from a list of 17532 Experts worldwide ranked by ideXlab platform
Mehmet Akyüz - One of the best experts on this subject based on the ideXlab platform.
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determination of Aromatic Amines in hair dye and henna samples by ion pair extraction and gas chromatography mass spectrometry
Journal of Pharmaceutical and Biomedical Analysis, 2008Co-Authors: Mehmet AkyüzAbstract:Abstract A gas chromatography–mass spectrometry (GC–MS) method has been proposed for the determination of carcinogenic and toxic Aromatic Amines in hair dye, henna and dyed hair samples. The method includes ion-pair extraction of Aromatic Amines from aqueous samples with bis-2-ethylhexylphosphate (BEHPA) released after solving the samples in acidic solution followed by sonication, derivatisation of compounds with isobutyl chloroformate (IBCF) and their GC–MS analysis in both electron impact (EI) and positive and negative ion chemical ionisation (PNICI) mode as their isobutyloxycarbonyl ( iso BOC) derivatives. The obtained recoveries of Aromatic Amines ranged from 92.2 to 98.4% and the precision of this method, as indicated by the relative standard deviations (RSDs) was within the range of 0.7–4.2%. The detection limits obtained from calculations by using GC–MS results based on signal-to-noise ratio (S/N)= 3 were within the range from 0.02 to 0.20 ng/g. In the present study, the commercially available 54 permanent hair dye, 35 modified or natural henna and 15 dyed hair samples were analysed for the Aromatic Amines by the proposed method and the method was shown to be suitable to determine the Aromatic amine ingredients and metabolites of these commercial products.
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simultaneous determination of aliphatic and Aromatic Amines in water and sediment samples by ion pair extraction and gas chromatography mass spectrometry
Journal of Chromatography A, 2006Co-Authors: Mehmet AkyüzAbstract:Abstract A gas chromatography–mass spectrometry (GC–MS) method has been proposed for the determination of aliphatic and Aromatic Amines in a variety of environmental samples including wastewater, river water, sea water and sediment samples. The method includes ion-pair extraction with bis-2-ethylhexylphosphate (BEHPA), derivatisation of compounds with isobutyl chloroformate (IBCF) and their GC–MS analysis. Aliphatic and Aromatic Amines were isolated from aqueous samples using BEHPA as ion-pair reagent and derivatised with IBCF for their chromatographic analysis. Solid–liquid extraction of aliphatic and Aromatic Amines in sediment samples were performed in Soxhlet apparatus with acidic MeOH and ion-pair extraction with BEHPA were carried out for the isolation of Amines followed by derivatisation with IBCF. Aliphatic and Aromatic Amines were then analysed with GC–MS in both electron impact (EI) and positive and negative ion chemical ionisation (PNICI) mode as their isobutyloxycarbonyl (isoBOC) derivatives. The obtained recoveries ranged from 81.0 to 98.0% and the precision of this method, as indicated by the relative standard deviations (RSDs) was within the range of 0.5 and 4.3%. The detection limits obtained from calculations by using GC–MS results based on S/N = 3 were within the range from 0.07 to 0.50 ng/l.
Jacqueline Collin - One of the best experts on this subject based on the ideXlab platform.
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enantioselective ring opening of meso epoxides by Aromatic Amines catalyzed by lanthanide iodo binaphtholates
Organic Letters, 2005Co-Authors: Fabien Carree, Richard Gil, Jacqueline CollinAbstract:Lanthanide iodo binaphtholates are efficient enantioselective catalysts for the ring opening of meso-epoxides by various Aromatic Amines. The study of the influence of temperature on the ring openi...
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samarium iodides catalyzed meso epoxides ring opening by Aromatic Amines
Tetrahedron Letters, 2004Co-Authors: Fabien Carree, Richard Gil, Jacqueline CollinAbstract:Samarium diiodide catalyzes the ring opening of meso-epoxides by several Aromatic Amines affording β-aminoalcohols at room temperature. The use of bis-binaphthoxy iodo samarium allows an enantioselective desymmetrization of cyclohexene oxide by o-anisidine.
Shu Kobayashi - One of the best experts on this subject based on the ideXlab platform.
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catalytic asymmetric ring opening of meso epoxides with Aromatic Amines in water
ChemInform, 2006Co-Authors: Stephane Azoulay, Kei Manabe, Shu KobayashiAbstract:[reaction: see text] An operationally simple and environmentally benign protocol for the catalytic asymmetric ring opening of meso-epoxides with Aromatic Amines has been developed. The reactions proceeded smoothly in the presence of 1 mol % of Sc(OSO3C12H25)3 and 1.2 mol % of a chiral bipyridine ligand in water to afford beta-amino alcohols in high yields with excellent enantioselectivities.
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catalytic asymmetric ring opening of meso epoxides with Aromatic Amines in water
Organic Letters, 2005Co-Authors: Stephane Azoulay, Kei Manabe, Shu KobayashiAbstract:An operationally simple and environmentally benign protocol for the catalytic asymmetric ring opening of meso-epoxides with Aromatic Amines has been developed. The reactions proceeded smoothly in the presence of 1 mol % of Sc(OSO3C12H25)3 and 1.2 mol % of a chiral bipyridine ligand in water to afford β-amino alcohols in high yields with excellent enantioselectivities.
Fabien Carree - One of the best experts on this subject based on the ideXlab platform.
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enantioselective ring opening of meso epoxides by Aromatic Amines catalyzed by lanthanide iodo binaphtholates
Organic Letters, 2005Co-Authors: Fabien Carree, Richard Gil, Jacqueline CollinAbstract:Lanthanide iodo binaphtholates are efficient enantioselective catalysts for the ring opening of meso-epoxides by various Aromatic Amines. The study of the influence of temperature on the ring openi...
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samarium iodides catalyzed meso epoxides ring opening by Aromatic Amines
Tetrahedron Letters, 2004Co-Authors: Fabien Carree, Richard Gil, Jacqueline CollinAbstract:Samarium diiodide catalyzes the ring opening of meso-epoxides by several Aromatic Amines affording β-aminoalcohols at room temperature. The use of bis-binaphthoxy iodo samarium allows an enantioselective desymmetrization of cyclohexene oxide by o-anisidine.
John C G Zhao - One of the best experts on this subject based on the ideXlab platform.
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enantioselective ring opening of meso epoxides by Aromatic Amines catalyzed by a homochiral metal organic framework
Chemical Communications, 2013Co-Authors: Sridhar Regati, Muralidhara Thimmaiah, Shengchang Xiang, Banglin Chen, John C G ZhaoAbstract:The enantioselective ring-opening of meso-epoxides by Aromatic Amines was achieved by using a new chiral metal–organic framework UTSA-32a. The corresponding α-hydroxyAmines were obtained with good yields and ee values (up to 89% ee).