Quantitative Determination of P-Coumaric Acid in Echinacea Purpurea Press Juice And Urgenin. A Validated Method

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Abstract
Echinacea purpurea species have been studied by various authors over the last decade. The starting material was the fresh or dried plant, or an ethanolic extract in which cichoric acid and derivatives were one of the major constituent groups. In our search for a suitable marker for the Echinacea press juice we found that cichoric acid was not the major compound but p-coumaric acid. The amount of p-coumaric acid was therefore determined in Echinacea press juice and Urgenin® and the method was validated.