Application of Monoalkyl Methanephosphonates to Extraction of Selected Metals

1996 ◽  
Vol 61 (8) ◽  
pp. 1177-1181 ◽  
Author(s):  
Alena Tokárová ◽  
Oldřich Navrátil ◽  
Petr Sládek
Keyword(s):  
Organic Solvents ◽  
Partition Coefficients ◽  
Extraction Constants

The distribution of scandium and hafnium between 0.1 or 1.0 mol l-1 HNO3 and solutions of monoalkyl methanephosphonates (HA; alkyl = methyl, propyl, butyl, isobutyl, pentyl, 2-methylbutyl, cyclohexyl, 1,2,2-trimethylpropyl) in chloroform and 1,1,2,2-tetrachloroethane has been studied. The organic solvents mentioned allow to obtain the optimum values of partition coefficients of the two metals. The corresponding extraction constants of the ScA3(HA)x and Hf(NO3)4(HA)4 complexes have been calculated.

scholarly journals Calculating the Partition Coefficients of Organic Solvents in Octanol/Water and Octanol/Air

2019 ◽  
Vol 59 (5) ◽  
pp. 2257-2263 ◽  
Author(s):  
Miroslava A. Nedyalkova ◽  
Sergio Madurga ◽  
Marek Tobiszewski ◽  
Vasil Simeonov
Keyword(s):  
Organic Solvents ◽  
Partition Coefficients

Age-Dependent Partition Coefficients for a Mixture of Volatile Organic Solvents in Sprague-Dawley Rats and Humans

2007 ◽  
Vol 70 (20) ◽  
pp. 1745-1751 ◽  
Author(s):  
Deirdre A. Mahle ◽  
Jeffery M. Gearhart ◽  
Claude C. Grigsby ◽  
David R. Mattie ◽  
Hugh A. Barton ◽  
...  
Keyword(s):  
Organic Solvents ◽  
Partition Coefficients ◽  
Sprague Dawley ◽  
Sprague Dawley Rats ◽  
Volatile Organic ◽  
Age Dependent

Partition Coefficients of Biologically Important Pyrimidines and Purines [1]

1986 ◽  
Vol 41 (12) ◽  
pp. 1580-1582 ◽  
Author(s):  
Cyril Párkányi ◽  
Dah-Chung Shieh
Keyword(s):  
Organic Solvents ◽  
Organic Phase ◽  
Partition Coefficients

AbstractPartition coefficients of sixteen biologically important pyrimidines and purines between an organic phase and water have been determined and the best organic solvents for their extraction have been suggested.

scholarly journals Purification of Extracellular Cholesterol Oxidase with High Activity in the Presence of Organic Solvents from Pseudomonas sp. Strain ST-200

1998 ◽  
Vol 64 (5) ◽  
pp. 1929-1932 ◽  
Author(s):  
Noriyuki Doukyu ◽  
Rikizo Aono
Keyword(s):  
Organic Solvents ◽  
Partition Coefficients ◽  
Culture Supernatant ◽  
Cholesterol Oxidase ◽  
Cholesterol Oxidation ◽  
Hydroxyl Groups ◽  
Pseudomonas Sp ◽  
Michaelis Constant ◽  
Optimal Activity ◽  
Extracellular Cholesterol Oxidase

ABSTRACT Extracellular cholesterol oxidase of Pseudomonas sp. strain ST-200 was purified from the culture supernatant. This oxidase contained bound flavin and was categorized as a 3β-hydroxysteroid oxidase, converting 3β-hydroxyl groups to keto groups. The molecular mass was 60 kDa. The enzyme was stable at pH 4 to 11 and active at pH 5.0 to 8.5, showing optimal activity at pH 7 at 60�C. The Michaelis constant of the ST-200 cholesterol oxidase was lower than those of commercially available oxidases. The cholesterol oxidation rate was enhanced 3- to 3.5-fold in the presence of organic solvents, with log P ow values (partition coefficients of the organic solvent betweenn-octanol and water), in the range of 2.1 to 4.2, compared with that in the absence of organic solvents.

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