... method: UV1, reagent and instrument improved amino benzaldehyde methanol HP8453 uv-vis spectrophotometer 1 cm than color ... take 200 mg in 10 ml RongLiangPing, add methanol, ultrasonic oscillations 30 min, cold to room temperature ... filtrate 2 ml in 10 ml RongLiangPing, plus methanol 3 ml, improved amino benzaldehyde 5 ml, densely ... Tribulus Terrestris (40-90%) direct supplying from our factory !!!