scholarly journals Kinetics of Hydrolysis of p-Nitrophenyl Phosphate by Fowl Plasma Alkaline Phosphatase

1969 ◽  
Vol 48 (4) ◽  
pp. 1311-1316 ◽  
Author(s):  
I. Motzok ◽  
Janice Ley ◽  
Muriel I. Davies
Keyword(s):  
Alkaline Phosphatase ◽  
Kinetics Of Hydrolysis ◽  
Nitrophenyl Phosphate ◽  
Plasma Alkaline Phosphatase ◽  
Kinetics Of ◽  
Hydrolysis Of

Influence of pH on the Kinetics of Reactions Catalyzed by Alkaline Phosphatase

1973 ◽  
Vol 51 (7) ◽  
pp. 1096-1103 ◽  
Author(s):  
Irwin Hinberg ◽  
Keith J. Laidler
Keyword(s):  
Alkaline Phosphatase ◽  
Intestinal Alkaline Phosphatase ◽  
Nitrophenyl Phosphate ◽  
Wide Range ◽  
Coordinated Water ◽  
Ph Range ◽  
Barbital Buffer ◽  
Influence Of Ph ◽  
Kinetics Of ◽  
Hydrolysis Of

An experimental study has been made of the kinetics of the hydrolysis of p-nitrophenyl phosphate catalyzed by chicken-intestinal alkaline phosphatase. The work was done in barbital buffer (carbonate above pH 9.6), and covered the pH range from 7.0 to 10.0. A sufficiently wide range of substrate concentration was used to allow reliable values of [Formula: see text] and [Formula: see text] to be determined. The results lead to pK values of 8.1 and 8.6 for the free enzyme, and it is concluded that the Michaelis complex and the phosphoryl intermediate ionize only on the acid side, the former also having a pK of 8.1. It is suggested that the group of pK 8.1 is probably an α-amino group and that the group of pK 8.6 probably corresponds to the ionization of a Zn(II)-coordinated water molecule.

Tuning the Lewis acidity of metal–organic frameworks for enhanced catalysis

2021 ◽  
Author(s):  
Venkata Swaroopa Datta Devulapalli ◽  
Mélissandre Richard ◽  
Tian-Yi Luo ◽  
Mattheus L. De Souza ◽  
Nathaniel L. Rosi ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Nerve Agent ◽  
Metal Salts ◽  
Lewis Acidity ◽  
Kinetics Of Hydrolysis ◽  
Nitrophenyl Phosphate ◽  
Transition Metal Salts ◽  
Metal Organic ◽  
Kinetics Of ◽  
Hydrolysis Of

The kinetics of hydrolysis of dimethyl nitrophenyl phosphate (DMNP), a simulant of the nerve agent Soman, was studied and revealed transition metal salts as catalysts.

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.

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