Patent ID: 8293784

Claim:
A method for improving the solubility of a sparingly soluble substance which is an organic acid which comprises: (a) adding at least one α-amino acid derivative that is 2-pyrrolidone-5-carboxylic acid, creatinine, creatine, hydroxyectoine or a salt or hydrate thereof to a water- or aqueous-solutions, each comprising one or more sparingly soluble substances which are organic acids, (b) adding one or more sparingly soluble substances which are organic acids to a water- or aqueous-solutions, each comprising at least one α-amino acid derivative that is 2-pyrrolidone-5-carboxylic acid, creatinine, creatine, hydroxyectoine or a salt or hydrate thereof or (c) adding a mixture of one or more sparingly soluble substances which are organic acids and at least one α-amino acid derivative that is 2-pyrrolidone-5-carboxylic acid, creatinine, creatine, hydroxyectoine or a salt or hydrate thereof, to water or to an aqueous solution.