Microwaveassisted dynamic extraction (MADE) was evaluated for the extraction yield of anthraquinone from Chinese herb Rhubarb.The influence of some operation conditions,such as ethanol content, microwave irradiation power and solvent uptake rate,on the extraction yield of those compounds has been studied.The extracts were analyzed by spectrophotometer.The experimental results indicated that the highest extraction yield can be obtained by MADE when extraction solvent is 60% ethanl,solvent uptake rate is 4 mL...