Manganese-catalyzed water oxidation formation

It is difficult to estimate what the rate of the metal ion catalyzed oxidative deamination reaction of amino acids would be in natural waters. Hamilton and Revesz (30) found that the rate of oxidation of alanine in the presence of pyridoxal and manganese ions was inhibited by EDTA. Since metal ions in natural waters can be complexed by a variety of organic and inorganic compounds, their effectiveness in catalyzing the oxidative deamination of amino acids may be reduced. Also, the fraction of dissolved amino acids which would be complexed by metal ions at the pH and metal ion and amino acid concentrations found in natural waters must be considered. At neutral pH, where the amino group of the amino acid is protonated, the fraction of the amino acid that would be in the form of the metal ion complex depends upon the equilibrium constant for the formation of the complex and the pK of the amino proton of the amino acid. The reactions for the formation of the Cu2+-alanine complexes can be written as... 

Highly poisonous, odorless, colorless, tasteless gas. Very flammable, burns in air with a bright blue flame. Ignition pt in air 700. mp-205.0. bp-191.5°. d - M (liq) 0.814. d (gas) 0.968 (air — 1.000). dg at 760 mm 1.250 g/liter. The top pressure is 1500 psi. Flammable limits in air 12 to 75 vol %. Crit press 35 atm, crit temp — 139. Heat capacity at 20° 6.95 cal/mole/ C. Heal value per m3 3033 keal. Heat of formation — 26.39 kcal/mol. Dec into carbon and carhon dioxide between 400 and 700°, at lower temp when in contact with catalytic surfaces. Above 800° the equilibrium reaction favors CO formation. Hopcalite, a mixture of the oxides of manganese and copper, catalyzes the decompn at room temp, as does Pd on silica gel. Sparingly sol in water 3.3 ml /100 ml HjO at O 2.3 ml/100 ml HjO at 2(T freely absorbed by a coned soln of cuprous chloride in HC1 or in NHjOH. Appreciably sol in some organic solvents, such as ethyl acetate. CHCI. acetic acid- The soly in methanol and ethanol is about 7 times as great as the soly in water. 

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