Extraction and separation of solanesol from Nicotiana tobacum by supercritical fluid extraction and silica gel column chromatography Componential Analysis and Acaricidal Activities of Stellera chamaejasme Extracts by Supercritical Fluid Extraction Determination of Rhein,Emodin and Physcion in Tuber Fleeceflower (Polygonum multiflorum) by Supercritical Fluid Extraction-HPLC