Method for producing a carnosic acid-rich plant extract
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United States of America Patent
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Aug 20, 2013
Grant Date -
Aug 16, 2012
app pub date -
Oct 12, 2010
filing date -
Oct 26, 2009
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Abstract
A carnosic acid-rich plant extract can be produced by extracting a dried and comminuted plant material containing carnosic acid with supercritical CO2 at a pressure of at least 200 bar and at a temperature of at most 100° C. In a first step, supercritical CO2 in a quantity of 10 to 50 kg of CO2 per kg of plant material is passed through the plant material to obtain a first CO2 extract. In a second step, additional supercritical CO2 is passed through the plant material to obtain a second CO2 extract, and a carnosic acid-rich plant extract is separated from the second CO2 extract by lowering the pressure.
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