Figure 9From: Evaluation and differentiation of the Betulaceae birch bark species and their bioactive triterpene content using analytical FT-vibrational spectroscopy and GC-MSThe chromatogram and mass spectrum of lupeol, (ethanol/methanol, elution time 19.07 min). Tcol:50 °C(1 min)20 °C/min l;a 310 °C(15 min); M=426.Back to article page