Optimization of Processing Parameters for the Ultrasonic Extraction of Geranium

摘要

A simple and rapid ultrasonic-assisted extraction (UAE) procedure has been developed and optimized for ethanol extraction yield (EEY ) from the Geranium. Several variables that could potentially affect the extraction efficiency, namely, ethanol fraction (%), ultrasonic extracting time (min), liquid.solid ratio (volume per mass) have been optimized by means of response surface methodology (RSM). The optimum conditions were ethanol fraction 66%, liquid.solid ratio (volume per mass) 16:1 and ultrasonic extracting time 64min, Under the optimum operating conditions, the extraction yield was 24.12 %, and UAE showed significantly higher recoveries than those obtained by the conventional extraction methods ( reflux extraction). In addition, a drastic reduction of the ultrasonic extraction time (60 min vs. 8 h) and solvent consumption (16 vs. 30) was achieved, comparable with that provided by the reflux extraction as a reference method.