THE OXIDATION OF SOME DIBASIC ACIDS

1930 ◽  
Vol 3 (4) ◽  
pp. 291-305 ◽  
Author(s):  
W. H. Hatcher ◽  
W. H. Mueller
Keyword(s):  
Hydrogen Peroxide ◽  
Side Reaction ◽  
Hydrogen Ion ◽  
Ion Concentration ◽  
Hydrogen Ion Concentration ◽  
Rate Of Reaction ◽  
Geometrical Isomerism

This paper gives the results obtained when hydrogen peroxide is employed to oxidize malonic, tartronic, succinic, malic, tartaric, maleic and fumaric acids. The rate of reaction for each has been determined and compared with previous findings for other compounds. The mode of oxidation suggests in each case a complex through which decomposition occurs; the rates of reaction indicate the comparability of saturated acids having the same number of carbon atoms, the constancy of mono-hydroxylization in its velocity influence, and the diverse effects of hydrogen ion concentration. The effects of geometrical isomerism and the ethylenic linkage are well-marked. The formation of peracids is to be regarded in the nature of a side-reaction in these oxidations.

scholarly journals THE DECOMPOSITION OF HYDROGEN PEROXIDE BY LIVER CATALASE

1928 ◽  
Vol 11 (4) ◽  
pp. 309-337 ◽  
Author(s):  
John Williams
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Decomposition ◽  
Hydrogen Ion ◽  
Ion Concentration ◽  
Concentrated Solutions ◽  
Hydrogen Ion Concentration ◽  
A Value ◽  
Optimum Ph ◽  
Adsorption Of Hydrogen ◽  
New Interpretation

1. The velocity of decomposition of hydrogen peroxide by catalase as a function of (a) concentration of catalase, (b) concentration of hydrogen peroxide, (c) hydrogen ion concentration, (d) temperature has been studied in an attempt to correlate these variables as far as possible. It is concluded that the reaction involves primarily adsorption of hydrogen peroxide at the catalase surface. 2. The decomposition of hydrogen peroxide by catalase is regarded as involving two reactions, namely, the catalytic decomposition of hydrogen peroxide, which is a maximum at the optimum pH 6.8 to 7.0, and the "induced inactivation" of catalase by the "nascent" oxygen produced by the hydrogen peroxide and still adhering to the catalase surface. This differs from the more generally accepted view, namely that the induced inactivation is due to the H2O2 itself. On the basis of the above view, a new interpretation is given to the equation of Yamasaki and the connection between the equations of Yamasaki and of Northrop is pointed out. It is shown that the velocity of induced inactivation is a minimum at the pH which is optimal for the decomposition of hydrogen peroxide. 3. The critical increment of the catalytic decomposition of hydrogen peroxide by catalase is of the order 3000 calories. The critical increment of induced inactivation is low in dilute hydrogen peroxide solutions but increases to a value of 30,000 calories in concentrated solutions of peroxide.

scholarly journals HYDROGEN ION CONCENTRATION OF CULTURES OF PNEUMOCOCCI OF THE DIFFERENT TYPES IN CARBOHYDRATE MEDIA

1919 ◽  
Vol 30 (4) ◽  
pp. 359-378 ◽  
Author(s):  
O. T. Avery ◽  
Glenn E. Cullen
Keyword(s):  
Hydrogen Ion ◽  
Ion Concentration ◽  
Hydrogen Ion Concentration ◽  
Rate Of Reaction ◽  
Different Types ◽  
Optimum Reaction ◽  
Reaction Change

1. The optimum hydrogen ion concentration for growth of pneumococcus is pH 7.8. 2. In broth cultures growth of pneumococcus continues until a final hydrogen ion concentration of about pH 5.0 is reached, if sufficient fermentable carbohydrate' (above 0.4 per cent) is present. Apparently this acidity is sufficient in itself to stop growth. 3. If less carbohydrate is present in the medium growth ceases at a lower hydrogen ion concentration, apparently because of exhaustion of carbohydrate. If no carbohydrate is present save that extracted from the meat of which the broth is made (plain broth medium), growth initiated at pH 7.8 (optimum reaction) ceases at about pH 7.0. 4. If bacteria-free filtrates of plain broth cultures in which growth has ceased are readjusted to pH 7.8 and reinoculated with pneumococcus, no growth occurs unless carbohydrate is added. However, if bacteria-free filtrates of dextrose broth cultures in which growth has ceased (pH 5) are readjusted to pH 7.8 and reinoculated with pneumococcus growth occurs. 5. Cultures of pneumococcus with all the carbohydrates which were fermentable under the conditions used, namely maltose, saccharose, lactose, galactose, raffinose, dextrose, and inulin, gave identical results in the rate of reaction change, and final hydrogen ion concentration (pH 5.0) attained. 6. The different immunological types of pneumococcus, for the limited number of strains studied, behaved alike in fermenting the carbohydrates mentioned above.

The influence of hydrogen-ion concentration on the decomposition of soil Organic matter by hydrogen peroxide (With two text-figures.)

1932 ◽  
Vol 22 (1) ◽  
pp. 92-100 ◽  
Author(s):  
J. S. Hosking
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Matter ◽  
Acid Soils ◽  
Clay Content ◽  
Hydrogen Ion ◽  
Ion Concentration ◽  
Soil Reaction ◽  
Definite Function ◽  
Alkaline Soils ◽  
Hydrogen Ion Concentration

The decomposition of the organic matter of the soil by means of hydrogen peroxide is shown to be a function of the hydrogen-ion concentration of the soil, alkaline soils permitting of a very low degree of oxidation, while with acid soils up to 90 per cent, of the organic matter is destroyed.The results obtained with a range of soils suggest that a portion of the organic matter is oxidised irrespective of the soil reaction, while the oxidation of the remainder is a definite function of the hydrogen-ion concentration, the relation being expressed by the equationThe proportion of the organic matter oxidised further appears to be a definite function of the clay content of the soil. Alkaline soils containing free manganese dioxide also show small losses.

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