Method for producing indigo-plant leaf extract
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United States of America Patent
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Jul 11, 2017
Grant Date -
Dec 12, 2013
app pub date -
Mar 14, 2012
filing date -
Mar 14, 2011
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Abstract
An object of the present invention is to provide a tryptanthrin-containing indigo-plant leaf extract particularly suitable for application to the skin. The present invention provides a method for producing a tryptanthrin-containing indigo-plant leaf extract, the method comprising filtering a mixture of a concentrated ethanol extract of indigo-plant leaves and a polyhydric alcohol, and collecting the filtrate. The present invention further provides an indigo-plant leaf extract produced by this method.
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