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. 2005 Oct 31;10(10):1242–1251. doi: 10.3390/10101242

Figure 1.

Figure 1

HPLC trace of an ethanolic Echinacea preparation containing Echinacea angustifolia and Echinacea purpurea root. The elution gradient was ramped from 30 to 100% acetonitrile:50 mM phosphoric acid over 55 minutes.