Determination of sarsasapogenin in crude Anemarrhena asphodeloides and its preparation by RP-HPLC-ELSD Steroids from the Roots of Asparagus officinalis and Their Cytotoxic Activity Determination of Sarsasapogenin in Anemarrhena asphodeloides Bunge by GC TLC-Densitometric Determination of Sarsasapogenin in Anemarrhena asphodeloides Bge