Kinetics of a heterogeneous enzymic hydrolysis of a prochiral diester

1992 ◽  
Vol 57 (16) ◽  
pp. 4544-4546 ◽  
Author(s):  
George B. Smith ◽  
Mahadevan Bhupathy ◽  
George C. Dezeny ◽  
Alan W. Douglas ◽  
Russel J. Lander
Keyword(s):  
Enzymic Hydrolysis ◽  
Kinetics Of ◽  
Hydrolysis Of

Kinetics of enzymic hydrolysis of cassava flour starch - optimization and modelling

2007 ◽  
Vol 27 (4) ◽  
pp. 465-472 ◽  
Author(s):  
KRZYSZTOF N. WALISZWESKI ◽  
MIGUEL GARCIA ALVARADO ◽  
JAVIER DE LA CRUZ MEDINA
Keyword(s):  
Enzymic Hydrolysis ◽  
Cassava Flour ◽  
Kinetics Of ◽  
Hydrolysis Of

Dependence of in vitro Enzymic Hydrolysis of Alkyl(2-benzoyloxyethyl)dimethylammonium Bromides on the Alkyl Length

1998 ◽  
Vol 63 (2) ◽  
pp. 245-251 ◽  
Author(s):  
Eva Olaszová ◽  
Ingrid Paulíková ◽  
Otto Helia ◽  
Emil Švajdlenka ◽  
Ferdinand Devínský ◽  
...  
Keyword(s):  
Benzoic Acid ◽  
Alkyl Chain ◽  
Ammonium Nitrogen ◽  
Acid Formation ◽  
Ester Bond ◽  
Enzymic Hydrolysis ◽  
Kinetics Of ◽  
Hydrolysis Of ◽  
Alkyl Length

Microsomal esterases were used in the study of the in vitro enzymic hydrolysis of the ester bond in alkyl(2-benzoyloxyethyl)dimethylammonium bromides. These compounds are potential "soft" disinfectants, easily biodegradable to nontoxic biologically inactive hydrolytic products, namely substituted choline and benzoic acid. Formation of the latter product was used to monitor the kinetics of the reaction. It has been found that the rate of enzymic hydrolysis is substantially influenced by different length of the alkyl chain on the ammonium nitrogen. At the same time, interspecies (rat-mouse) and interorgan (liver-kidney) variability has been observed.

scholarly journals SIMILARITY OF THE KINETICS OF INVERTASE ACTION IN VIVO AND IN VITRO

1932 ◽  
Vol 15 (5) ◽  
pp. 491-495 ◽  
Author(s):  
J. M. Nelson ◽  
Elizabeth T. Palmer ◽  
B. G. Wilkes
Keyword(s):  
Yeast Cells ◽  
Enzymic Hydrolysis ◽  
Kinetics Of ◽  
Hydrolysis Of ◽  
Live Yeast

1. A method is given whereby the course of hydrolysis of sucrose by live yeast cells may be followed with precision equal to that found when invertase solutions prepared from autolyzed yeast are used to cause inversion. 2. The practical value of the equation of Nelson and Hitchcock as a means of following the course of enzymic hydrolysis of sucrose is hereby extended. 3. The inversion of sucrose by live yeast cells and by extracted invertase has been quantitatively compared. 4. The course of hydrolysis of sucrose by the invertase of Fleischmann's yeast has been found to be identical in vivo and in vitro.

Kinetics of enzymic hydrolysis of malto-oligosaccharides: A comparison with acid hydrolysis

1987 ◽  
Vol 166 (1) ◽  
pp. 71-83 ◽  
Author(s):  
Pier Luigi Beltrame ◽  
Paolo Carniti ◽  
Bonaventura Focher ◽  
Annamaria Marzetti ◽  
Cataldo Santoro ◽  
...  
Keyword(s):  
Acid Hydrolysis ◽  
Enzymic Hydrolysis ◽  
Kinetics Of ◽  
Hydrolysis Of

Influence of medium on alkaline hydrolysis of succinic acid monomethyl and monopropyl esters

1980 ◽  
Vol 45 (11) ◽  
pp. 2873-2882
Author(s):  
Vladislav Holba ◽  
Ján Benko
Keyword(s):  
Succinic Acid ◽  
Kinetic Parameters ◽  
Alkaline Hydrolysis ◽  
Specific Interactions ◽  
Nonaqueous Media ◽  
The Media ◽  
Kinetics Of ◽  
Hydrolysis Of

The kinetics of alkaline hydrolysis of succinic acid monomethyl and monopropyl esters were studied in mixed aqueous-nonaqueous media at various temperatures and ionic strengths. The results of measurements are discussed in terms of electrostatic and specific interactions between the reactants and other components of the reaction mixture. The kinetic parameters in the media under study are related to the influence of the cosolvent on the solvation sphere of the reactants.

Belousov–Zhabotinskii type oscillation reaction with glycerol and kinetics of reactions between the system components

1987 ◽  
Vol 52 (10) ◽  
pp. 2375-2382 ◽  
Author(s):  
Ľubica Adamčíková ◽  
Peter Ševčík
Keyword(s):  
Oscillation System ◽  
Chemical Oscillations ◽  
Oscillation Reaction ◽  
Reaction Solution ◽  
System Components ◽  
Probable Source ◽  
Belousov Zhabotinskii Reaction ◽  
Kinetics Of ◽  
Hydrolysis Of ◽  
Type Oscillation

Glycerol causes chemical oscillations in Belousov-Zhabotinskii reaction in a closed system as well as in a reaction solution bubbled with nitrogen. Since the oxidation of glycerol with bromate ions does not proceed autocatalytically and bromine in the oxidation state 0 or +1 in the absence of light does not react with glycerol, hydrolysis of bromine is the probable source of bromide ions in the studied oscillation system.

Kinetics of hydrolysis of peroxodisulphate ions in acidic medium to peroxomonosulphuric acid

1981 ◽  
Vol 46 (5) ◽  
pp. 1229-1236 ◽  
Author(s):  
Jan Balej ◽  
Milada Thumová
Keyword(s):  
Ionic Strength ◽  
Rate Constants ◽  
Acidic Medium ◽  
Measured Data ◽  
Molar Ratios ◽  
Starting Solution ◽  
Kinetics Of Hydrolysis ◽  
Rate Of Hydrolysis ◽  
Kinetics Of ◽  
Hydrolysis Of

The rate of hydrolysis of S2O82- ions in acidic medium to peroxomonosulphuric acid was measured at 20 and 30 °C. The composition of the starting solution corresponded to the anolyte flowing out from an electrolyser for production of this acid or its ammonium salt at various degrees of conversion and starting molar ratios of sulphuric acid to ammonium sulphate. The measured data served to calculate the rate constants at both temperatures on the basis of the earlier proposed mechanism of the hydrolysis, and their dependence on the ionic strength was studied.

Cyclization and acid-catalyzed hydrolysis of O-benzoylbenzamidoximes

1986 ◽  
Vol 51 (12) ◽  
pp. 2786-2797
Author(s):  
František Grambal ◽  
Jan Lasovský
Keyword(s):  
Reaction Rate ◽  
Kinetic Isotope ◽  
Acid Base Equilibrium ◽  
Mineral Acids ◽  
Kinetics Of Formation ◽  
Acid Catalyzed ◽  
Ph Scale ◽  
Kinetics Of ◽  
Hydrolysis Of ◽  
Derivatives Of

Kinetics of formation of 1,2,4-oxadiazoles from 24 substitution derivatives of O-benzoylbenzamidoxime have been studied in sulphuric acid and aqueous ethanol media. It has been found that this medium requires introduction of the Hammett H0 function instead of the pH scale beginning as low as from 0.1% solutions of mineral acids. Effects of the acid concentration, ionic strength, and temperature on the reaction rate and on the kinetic isotope effect have been followed. From these dependences and from polar effects of substituents it was concluded that along with the cyclization to 1,2,4-oxadiazoles there proceeds hydrolysis to benzamidoxime and benzoic acid. The reaction is thermodynamically controlled by the acid-base equilibrium of the O-benzylated benzamidoximes.

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