SUPERCRITICAL CARBON-DIOXIDE EXTRACTION OF ANGELICA-ARCHANGELICA L. ROOT OIL

Angelica (var. Angelica archangelica L.) oil was isolated from grated fresh roots of the plant by supercritical fluid extraction using carbo n dioxide and a two-stage fractional separation system. Throughout the extraction process the pressure and temperature were maintained at 12 0 bar and 40 degrees C: respectively. A 1 h static extraction step was followed by a 2 h dynamic extraction conducted at a flow rate of 0.5 kg h(-1). The extracted material was characterized by capillary gas ch romatography-mass spectrometry using three different mass spectra libr aries. More than 200 compounds were found in the extracted oil, of whi ch 118 compounds were positively identified and four other compounds t entatively identified. (C) 1998 Elsevier Science B.V.