Study on rutin extraction from old stem of asparagus flour

The effects were studied of temperature,ultrasonic power,ethanol mass fraction and the ratio of material to liquid on extraction of rutin from the older stem of asparagus flour by different extraction of ultrasonication and ethanol soaking.The extracting processing was optimized through single factor experiment and orthogonal regression experiments.Results showed that : the yields of rutin was higher by ultrasonication than that of ethanol soaking,and the optimum conditions were as follows : the ultrasonic power 90W,ethanol mass fraction 60%,optimum temperature 80 ℃,and the ratio of material to liquid 1∶25(m∶V),and the yields of rutin was 4.53%.