微波萃取与常规提取方法对大黄总蒽醌提取率的影响

试验研究了大黄总蒽醌的微波辅助提取、超声提取和索氏提取方法，并利用分光光度法测定了提取液中总蒽醌的含量。结果表明：微波辅助提取法的提取率最高(1．91％)，是超声法的1．13倍，是索氏提取法的1．29倍。微波辅助提取法仅需10min，而索氏法和超声法分别需要90，30min。微波辅助提取法用于中药大黄的提取，具有高效、省时的特点。

Effect of Microwave Assisted Extraction and Conventional Extraction Techniques on Extraction Rate of Total Rheum anthraquinone in Rheum officinale

The effect of microwave-assisted extraction(MAE) technique on the extraction rate of total Rheum anthraquinone in Rheum officinale was studied. Extraction techniques using microwave extraction, ultrasonic extraction(UE) and Soxhlet extraction were compared for the extraction rate of total Rehum anthraquinone in Rheum officinale. The extracts were analyzed by visible-spectrophotometric. Among the three methods, the efficiency of MAE was 1.13 times that of ultrasonic extraction, and 1.29 times that of Soxhlet extraction, respectively. MAE only needed 10 min, but ultrasonic extraction and Soxhlet extraction needed 30 min and 1.5 hour. Due to the considerable saving of time and high extraction efficiency, MAE was more effective than that of the conventional methods.