In conventional extractions, the use of large volumes of solvent increases the extraction recovery. Studies reported that the extraction solution must not exceed 30–34% (w/v) [ 8 ] . In many applications a ratio 10:1 (ml/mg) to 20:1 (ml/mg) was found to be optimal [ 34, 36 ] . In addition, the solvent volume is an important factor to be considered because too much of the extracting solvent means more energy and time is required to condense the extraction solution in the later step and puri fi cation process. On the other hand, MAE may give lower recoveries because of nonuniform distribution and exposure to microwaves [ 37 ] .