ChemInform Abstract: KINETICS OF HYDROLYSIS OF PHOSPHORIC ACID ESTERS

1977 ◽  
Vol 8 (51) ◽  
Author(s):  
V. E. BEL'SKII
Keyword(s):  
Phosphoric Acid ◽  
Kinetics Of Hydrolysis ◽  
Kinetics Of ◽  
Hydrolysis Of ◽  
Acid Esters

Kinetics of hydrolysis of polymethacrylic acid esters

1975 ◽  
Vol 17 (5) ◽  
pp. 1276-1289 ◽  
Author(s):  
A.D. Litmanovich ◽  
N.A. Plate ◽  
V.A. Agasandyan ◽  
O.V. Noa ◽  
E. Yun ◽  
...  
Keyword(s):  
Polymethacrylic Acid ◽  
Kinetics Of Hydrolysis ◽  
Kinetics Of ◽  
Hydrolysis Of ◽  
Acid Esters

Further studies of the specificity of carboxypeptidase A towards hippuric acid esters

1978 ◽  
Vol 56 (16) ◽  
pp. 2188-2193
Author(s):  
John W. Bunting ◽  
Samuel S.-T. Chu
Keyword(s):  
Ionic Strength ◽  
Hippuric Acid ◽  
Substrate Inhibition ◽  
Carboxypeptidase A ◽  
Hydrophobic Pocket ◽  
Substrate Activation ◽  
Kinetics Of Hydrolysis ◽  
Kinetics Of ◽  
Hydrolysis Of ◽  
Acid Esters

The kinetics of hydrolysis of a series of 10 new hippurate esters (C6H5CONHCH2CO2CRR1CO2H (I)) by bovine pancreatic carboxypeptidase A have been investigated at pH 7.5, 25 °C, and ionic strength 0.5. Pronounced substrate inhibition was displayed by I: R = H, R1 = C6H5(CH2)2, 3-indolylmethyl, 4-HOC6H4CH2, and 4-FC6H4 whereas pronounced substrate activation was observed for I: R = H, R1 = 4-CH3C6H4, 4-C2H5C6H4, 4-C6H5C6H4, 1-naphthyl, 2-naphthyl, and R = R1 = C2H5. In all cases substrate activation and substrate inhibition were shown to be consistent with ES2 complex formation similar to that previously observed for other hippurate esters. Kinetic parameters were evaluated for each ester and it is noted that ail 13 hippurate esters now known to display substrate inhibition have kcat/Km > 106 M−1 min−1, whereas kcat/km < 106 M−1 min−1 for all 9 hippurate esters known to display substrate activation. The enzymic specificity for the R1 unit of I suggests binding of R1 in a 'bent' hydrophobic pocket having a restricted entrance.

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.

Kinetics of Hydrolysis of Some Bifunctional Schiff Bases

1990 ◽  
Vol 37 (5) ◽  
pp. 479-487 ◽  
Author(s):  
M.R. Mahmoud ◽  
A.M. El-Nady ◽  
F.A. Adam ◽  
M.A. El-Taher
Keyword(s):  
Schiff Bases ◽  
Kinetics Of Hydrolysis ◽  
Kinetics Of ◽  
Hydrolysis Of
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