Patent ID: 8778423

Claim:
A process for producing a purified chlorogenic acid-containing preparation, comprising: dispersing or dissolving a chlorogenic acid-containing composition as a starting material in the presence of acid clay or activated clay in a mixed solvent of 10 to 95% of ethanol and water to form a dispersion or solution; removing a deposit from the dispersion or solution to obtain a first solution; concentrating the level of chlorogenic acids in the first solution and adjusting the pH of the first solution to a concentration of from 2.5 to 8 mass % and a pH of 2 to 3.5, respectively, to form a concentrated pH-adjusted solution; and separating a deposit from the concentrated pH-adjusted solution; and wherein said process further comprises (i) reducing the concentration of the ethanol in the first solution to 5 mass % or lower; and/or (ii) reducing the concentration of the ethanol in the concentrated pH-adjusted solution to 5 mass % or lower.