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The monitoring method of rapid hydrothermal reactions was successfully applied to the racemization of amino acids at 225-275 o C. The rate constants of racemization of alanine, leucine, and phenylalanine were determined and the apparent activation energy was 124kJmol -1 for alanine, 120kJmol -1 for leucine, and 115kJmol -1 for phenylalanine, which are...