Patent ID: 9700556
Date: 2017-07-11
CPC Classifications: A61K,A61P,A61Q

Claim:
1. A method for producing a tryptanthrin-containing indigo-plant leaf extract, comprising sequentially performing the following steps (i) to (v): (i) extracting indigo-plant leaves with ethanol, followed by removing the indigo-plant leaves from the ethanol to obtain an ethanol extract of indigo-plant leaves, wherein the indigo-plant leaves have been removed; (ii) concentrating the ethanol extract of indigo-plant leaves to obtain a concentrated ethanol extract of indigo-plant leaves; (iii) mixing the concentrated ethanol extract of indigo-plant leaves with polyhydric alcohol to obtain a mixture of the concentrated ethanol extract of indigo-plant leaves and the polyhydric alcohol; (iv) filtering the mixture of the concentrated ethanol extract of indigo-plant leaves and the polyhydric alcohol to obtain a filtrate, wherein the filtrate is the tryptanthrin-containing indigo-plant leaf extract; and (v) collecting the filtrate.