
A new method based on supercritical fluid extraction for polyacetylenes and polyenes from Echinacea pallida (Nutt.) Nutt. roots
Keywords: SFE; supercritical fluid extraction; SE; Soxhlet extraction; DMEM; Dulbecco's modified Eagle's medium; MTT; 3-(4,5-dimethylthiazolyl-2)-2,5-diphenyltetrazolium bromide; FBS; fetal bovine serum; PBS; phosphate-buffered saline; NCI; National Cancer Inst