- Ultrasound-assisted surfactant/ionic liquid aqueous two-phase system extraction prior to high performance liquid chromatography for the determination of tetracyclines in milk and honey samples
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In this work, an ultrasonic-assisted surfactant/ionic liquid aqueous two-phase system (ATPS) extraction method was developed to extract six tetracycline antibiotics from food samples before their chromatographic determination using high performance liquid chromatography. The ATPS was formed with 1-allyl-3-methyl-imidazolium bromide, Triton X-100, and dipotassium hydrogen phosphate. The parameters including type and amount of surfactant, ionic liquid and salt, pH of sample solution, and sonication time were optimized. Under the optimized conditions, linear calibration curves of the six tetracyclines were obtained in the range of 10–500 μg L?1 with > r2 = 0.990 (n = 9). The proposed green analytical extraction method was applied to the analysis of tetracycline antibiotics in milk and honey samples with recovery of 50%–110% and 68%–117%, respectively.
- Antep, Hayriye Mine,Mumcu, Ta?k?n,Bostanci, Kamil,Seyhan Bozkurt, Serap,Merdivan, Melek
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p. 955 - 966
(2018/01/12)
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- Unraveling the synthesis of homoleptic [Ag(N, N -diaryl-NHC)2]Y (Y = BF4, PF6) complexes by ball-milling
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A user-friendly and general mechanochemical method was developed to access rarely described NHC (N-heterocyclic carbene) silver(i) complexes featuring N,N-diarylimidazol(idin)ene ligands and non-coordinating tetrafluoroborate or hexafluorophosphate counter anions. Comparison with syntheses in solution clearly demonstrated the superiority of the ball-milling conditions.
- Beillard, Audrey,Bantreil, Xavier,Métro, Thomas-Xavier,Martinez, Jean,Lamaty, Frédéric
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supporting information
p. 17859 - 17866
(2016/11/18)
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- A general and direct synthesis of imidazolium ionic liquids using orthoesters
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A general method to synthesize halide and halide-free ionic liquids was developed. Direct alkylation of imidazole and pyridine derivatives was performed in the presence of an acid using an orthoester as the alkyl donor yielding ionic liquid products. Residual Cl and water contents of the ionic liquids were determined by ion chromatography and a Karl-Fisher test. the Partner Organisations 2014.
- Kim, Do Joong,Oh, Kyung Hwan,Park, Jin Kyoon
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supporting information
p. 4098 - 4101
(2014/11/07)
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- Ionic liquid-assisted gelation of an organic solvent
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Tetrafluoroborate-containing ionic liquids allow for a room temperature gelation of dimethylsulfoxide, which contains an organogelator at below the minimum gelation concentration. The gel formation has no effect on the mobility of ions, as the conductivity values of ionic liquid-DMSO gels are virtually identical to those of ionic liquid-DMSO solutions.
- Smith, Nicholas W.,Knowles, Joshua,Albright, John G.,Dzyuba, Sergei V.
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scheme or table
p. 83 - 87
(2011/11/12)
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- An efficient protocol for the preparation of pyridinium and imidazolium salts based on the Mitsunobu reaction
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We report herein that, in the absence of any nucleophilic counterions, tertiary nitrogen nucleophiles such as pyridines and imidazoles can be alkylated with alcohols, by simply using their ammonium form as the acidic component of the Mitsunobu reaction. This led to efficient preparation of ionic liquids under mild conditions, avoiding the usual anion exchange step.
- Petit, Sylvain,Azzouz, Rabah,Fruit, Corinne,Bischoff, Laurent,Marsais, Francis
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p. 3663 - 3665
(2008/09/20)
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- Influence of different branched alkyl side chains on the properties of imidazolium-based ionic liquids
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Several new branched ionic liquids were synthesized under microwave irradiation applying two different synthetic approaches. Different already known ionic liquids, both linear and branched, were added to this set of new ionic liquids to investigate the influence of the branching on the thermophysical properties to elucidate first structure-property relationships. Thermogravimetric analysis was utilized to investigate the decomposition behavior and differential scanning calorimetry was used to study the influence of the branching on the thermal behavior, e.g. the melting point, the glass transition temperature, the freezing point and the cold crystallization temperature. Moreover, the water uptake of selected ionic liquids was analyzed. The Royal Society of Chemistry 2008.
- Erdmenger, Tina,Vitz, Juergen,Wiesbrock, Frank,Schubert, Ulrich S.
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supporting information; experimental part
p. 5267 - 5273
(2010/03/24)
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