Study on Microwave-assisted Extraction of Yellow Pigment from Gardenia Jasminoiedes Ellis

The optimum technological parameters of microwave-assisted extraction of gardenia yellow pigment(GYP) were(studied.) An orthogonal test table L_9(3~4) was used with the factors of ethanol concentration,ratio of solid to liquid,power of(microwave) radiation and extracting time.The content of GYP was determined by spectrophotometry.The optimum conditions are as follows:(60 %) EtOH as extracting solvent,solid to liguid ratio 1 ∶20,power of microwave 280 W and extracting time 40 s.The extract yield was(17.83%) and extraction rate reached 98.20%.Compared with traditional methods such as leaching by water or organic solvents,it was proved that microwave-assisted extraction of GYP is a rapid method with higher yield.