Abstract
Abstract The equilibrium constant for formation of adenosine from inosine and ammonia has been measured directly in the presence of adenosine deaminase at several pH values. The apparent free energy of hydrolysis of adenosine at pH 7.0 is -5.4 kcal per mole, and the free energy of hydrolysis to free ammonia and inosine is -2.2 kcal per mole, at ionic strength 1.0, 25°, with water concentration taken as 1. These values, which are comparable with indirect summations of thermochemical and equilibrium data for adenine and adenylic acid, are discussed in relation to earlier values for the hydrolysis of arginine and of amino acid amides.
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