... northern shaanxi, the loess plateau area, harvested time: 6 ~ 10 months properties: tan powder identify: (1) saponins positively reaction ... product precision says the product solution take 200 mg in 10 ml RongLiangPing, add methanol, ultrasonic oscillations 30 min, cold ... to absorb the filtrate 2 ml in 10 ml RongLiangPing, plus methanol 3 ml, improved amino benzaldehyde 5 ml, densely plug, shake well, ...