Determination of the dimerization constant of pinacyanol dye in mixed aqueous–organic solvent media with different hydrophobic character

2012 ◽  
Vol 173 ◽  
pp. 119-123 ◽  
Author(s):  
Homendra Naorem ◽  
Seram Dushila Devi
Keyword(s):  
Organic Solvent ◽  
Dimerization Constant ◽  
Hydrophobic Character ◽  
Organic Solvent Media

RDC Enhanced NMR Spectroscopy in Organic Solvent Media: The Importance for the Experimental Determination of Periodic Hydrogen Bonded Secondary Structures

2009 ◽  
Vol 131 (43) ◽  
pp. 15590-15591 ◽  
Author(s):  
Marelli Udaya Kiran ◽  
Ambadi Sudhakar ◽  
Jochen Klages ◽  
Grit Kummerlöwe ◽  
Burkhard Luy ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Organic Solvent ◽  
Experimental Determination ◽  
Secondary Structures ◽  
Organic Solvent Media ◽  
Hydrogen Bonded

The Acidity Constants of Some Pyrimidine Bases in Various Water Organic Solvent Media

2004 ◽  
Vol 94 (11) ◽  
pp. 847-856 ◽  
Author(s):  
Iman T. Ahmed ◽  
Ekram S. Soliman ◽  
Ahmed A. A. Boraei
Keyword(s):  
Organic Solvent ◽  
Acidity Constants ◽  
Organic Solvent Media ◽  
Pyrimidine Bases

scholarly journals Synthesis of alkyl esters by cutinase in miniemulsion and organic solvent media

2009 ◽  
Vol 4 (5) ◽  
pp. 674-683 ◽  
Author(s):  
Dragana P. C. de Barros ◽  
Luís P. Fonseca ◽  
Joaquim M. S. Cabral ◽  
Clemens K. Weiss ◽  
Katharina Landfester
Keyword(s):  
Organic Solvent ◽  
Alkyl Esters ◽  
Organic Solvent Media

scholarly journals With Solvent Extraction Method, and via new Organic Reagent 2-(Benzo thiazolyl azo)-4,5- Diphenyl Imidazole for Spectrophotometric Determination of Copper (II) in different Samples

2014 ◽  
Vol 11 (1) ◽  
pp. 147-157
Author(s):  
Baghdad Science Journal
Keyword(s):  
Organic Solvent ◽  
Spectrophotometric Determination ◽  
Extraction Method ◽  
Complex Structure ◽  
Organic Reagent ◽  
Complexing Agent ◽  
Solvent Extraction Method ◽  
Determination Of Copper ◽  
Synergism Effect

The new organic reagent 2-[Benzo thiazolyl azo]-4,5-diphenyl imidazole was prepared and used as complexing agent for separation and spectrophotometric determination of Cu2+ ion in some samples include plants, soil, water and human blood serum. Initially determined all factors effect on extraction method and the results show optimum pH was (pHex=9), optimum concentration was 40?g/5mLCu2+ and optimum shaking time was (15min.), as well stoichiometry study appears the complex structure was 1:1 Cu2+: BTADPI. Interferences effect of cations were studied. Synergism effect shows MIBK gave increasing in distribution ratio (D). Organic solvent effect appears there is no any linear relation between dielectric constant for organic solvent used and distribution ration (D). Thermodynamically found the reaction was Endothermic reaction, with ?Hex= 0.0131 KJ.mole-1,?Gex=-54.20 KJ.mole-1 ,?Sex= 167.84 J.mole-1.Beer’s law was obeyed over the concentration 1-30?g/5mL, and ?=922.90 Lmol-1.cm-1,with detection limit 1.7×10-5and Sandell’s sensitivity 6.8× 10-7 gcm-2.

Determination of Fungicides in Fruit Juice by Ultrasound-Assisted Dispersive Liquid–Liquid Microextraction Based on Solidification of Floating Organic Solvent Droplets Followed by High Performance Liquid Chromatography

2014 ◽  
Vol 97 (1) ◽  
pp. 183-187 ◽  
Author(s):  
Run-Zhen Fan ◽  
Congyun Liu ◽  
Wenqing Jiang ◽  
Xiaonan Wang ◽  
Fengmao Liu
Keyword(s):  
Organic Solvent ◽  
High Performance ◽  
Fruit Juice ◽  
Enrichment Factors ◽  
Wide Range ◽  
Separation And Preconcentration ◽  
Ultrasound Assisted ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

Abstract Ultrasound-assisted dispersive liquid–liquid microextraction (UA-DLLME) based on solidification of the floating organic solvent droplets (SFO) combined with HPLC was used for determination of five fungicides in fruit juice samples. 1-Dodecanol, which has a low density and low toxicity, was used as the extraction solvent in UA-DLLME. The solidification of floating organic dropletsfacilitates the transfer of analytes from the aqueous phase to the organic phase. This method was easy, quick, inexpensive, precise, and linear over a wide range. Under the optimized conditions, the enrichment factors for a 5 mL fruit juice sample were 25 to 56, and the LODs for the five fungicides ranged from 5 to 50 μg/L. The average recoveries ranged from 71.8 to 118.2% with RSDsof 0.9 to 13.9%. Application of the DLLME-SFO technique allows successful separation and preconcentration of the fungicides at a low concentration level in fruit juice samples.

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