Patent 7592465 was granted and assigned to AJINOMOTO CO., INC. on September, 2009 by the United States Patent and Trademark Office.
Contamination by microorganism of an aqueous proline solution is prevented by adjusting a proline concentration of the solution to 20% (W/W/) or more. Such solutions are useful as fertilizers and/or plan vitalizers. Preservation of the novel solutions are possible over a significant period of time, allowing for more flexibility in the distribution and application of commercial products made from the solutions.